Sample records for valves cxs applied

  1. Bifurcation and chaos in spin-valve pillars in a periodic applied magnetic field

    E-Print Network [OSTI]

    S. Murugesh; M. Lakshmanan

    2009-10-20T23:59:59.000Z

    We study the bifurcation and chaos scenario of the macro-magnetization vector in a homogeneous nanoscale-ferromagnetic thin film of the type used in spin-valve pillars. The underlying dynamics is described by a generalized Landau-Lifshitz-Gilbert (LLG) equation. The LLG equation has an especially appealing form under a complex stereographic projection, wherein the qualitative equivalence of an applied field and a spin-current induced torque is transparent. Recently chaotic behavior of such a spin vector has been identified by Zhang and Li using a spin polarized current passing through the pillar of constant polarization direction and periodically varying magnitude, owing to the spin-transfer torque effect. In this paper we show that the same dynamical behavior can be achieved using a periodically varying applied magnetic field, in the presence of a constant DC magnetic field and constant spin current, which is technically much more feasible, and demonstrate numerically the chaotic dynamics in the system for an infinitely thin film. Further, it is noted that in the presence of a nonzero crystal anisotropy field chaotic dynamics occurs at much lower magnitudes of the spin-current and DC applied field.

  2. Remote actuated valve implant

    DOE Patents [OSTI]

    McKnight, Timothy E; Johnson, Anthony; Moise, Jr., Kenneth J; Ericson, Milton Nance; Baba, Justin S; Wilgen, John B; Evans, III, Boyd McCutchen

    2014-02-25T23:59:59.000Z

    Valve implant systems positionable within a flow passage, the systems having an inlet, an outlet, and a remotely activatable valve between the inlet and outlet, with the valves being operable to provide intermittent occlusion of the flow path. A remote field is applied to provide thermal or magnetic activation of the valves.

  3. Safety valve

    DOE Patents [OSTI]

    Bergman, Ulf C. (Malmoe, SE)

    1984-01-01T23:59:59.000Z

    The safety valve contains a resilient gland to be held between a valve seat and a valve member and is secured to the valve member by a sleeve surrounding the end of the valve member adjacent to the valve seat. The sleeve is movable relative to the valve member through a limited axial distance and a gap exists between said valve member and said sleeve.

  4. Check valve

    DOE Patents [OSTI]

    Upton, H.A.; Garcia, P.

    1999-08-24T23:59:59.000Z

    A check valve for use in a GDCS of a nuclear reactor and having a motor driven disk including a rotatable armature for rotating the check valve disk over its entire range of motion is described. In one embodiment, the check valve includes a valve body having a coolant flow channel extending therethrough. The coolant flow channel includes an inlet end and an outlet end. A valve body seat is located on an inner surface of the valve body. The check valve further includes a disk assembly, sometimes referred to as the motor driven disc, having a counterweight and a disk shaped valve. The disk valve includes a disk base having a seat for seating with the valve body seat. The disk assembly further includes a first hinge pin member which extends at least partially through the disk assembly and is engaged to the disk. The disk valve is rotatable relative to the first hinge pin member. The check valve also includes a motor having a stator frame with a stator bore therein. An armature is rotatably positioned within the stator bore and the armature is coupled to the disk valve to cause the disk valve to rotate about its full range of motion. 5 figs.

  5. Check valve

    DOE Patents [OSTI]

    Upton, Hubert Allen (Morgan Hill, CA); Garcia, Pablo (Stanford, CA)

    1999-08-24T23:59:59.000Z

    A check valve for use in a GDCS of a nuclear reactor and having a motor driven disk including a rotatable armature for rotating the check valve disk over its entire range of motion is described. In one embodiment, the check valve includes a valve body having a coolant flow channel extending therethrough. The coolant flow channel includes an inlet end and an outlet end. A valve body seat is located on an inner surface of the valve body. The check valve further includes a disk assembly, sometimes referred to as the motor driven disc, having a counterweight and a disk shaped valve. The disk valve includes a disk base having a seat for seating with the valve body seat. The disk assembly further includes a first hinge pin member which extends at least partially through the disk assembly and is engaged to the disk. The disk valve is rotatable relative to the first hinge pin member. The check valve also includes a motor having a stator frame with a stator bore therein. An armature is rotatably positioned within the stator bore and the armature is coupled to the disk valve to cause the disk valve to rotate about its full range of motion.

  6. Valve stem and packing assembly

    DOE Patents [OSTI]

    Wordin, J.J.

    1991-09-03T23:59:59.000Z

    A valve stem and packing assembly is provided in which a rotatable valve stem includes a first tractrix surface for sliding contact with a stem packing and also includes a second tractrix surface for sliding contact with a bonnet. Force is applied by means of a spring, gland flange, and gland on the stem packing so the stem packing seals to the valve stem and bonnet. This configuration serves to create and maintain a reliable seal between the stem packing and the valve stem. The bonnet includes a second complementary tractrix surface for contacting the second sliding tractrix surface, the combination serving as a journal bearing for the entire valve stem and packing assembly. The journal bearing so configured is known as a Schiele's pivot. The Schiele's pivot also serves to maintain proper alignment of the valve stem with respect to the bonnet. Vertical wear between the surfaces of the Schiele's pivot is uniform at all points of contact between the second sliding tractrix surface and the second complementary tractrix surface of a bonnet. The valve stem is connected to a valve plug by means of a slip joint. The valve is opened and closed by rotating the valve stem. The slip joint compensates for wear on the Schiele's pivot and on the valve plug. A ledge is provided on the valve bonnet for the retaining nut to bear against. The ledge prevents over tightening of the retaining nut and the resulting excessive friction between stem and stem packing. 2 figures.

  7. Valve stem and packing assembly

    DOE Patents [OSTI]

    Wordin, John J. (Bingham County, ID)

    1991-01-01T23:59:59.000Z

    A valve stem and packing assembly is provided in which a rotatable valve stem includes a first tractrix surface for sliding contact with a stem packing and also includes a second tractrix surface for sliding contact with a bonnet. Force is applied by means of a spring, gland flange, and gland on the stem packing so the stem packing seals to the valve stem and bonnet. This configuration serves to create and maintain a reliable seal between the stem packing and the valve stem. The bonnet includes a second complementary tractrix surface for contacting the second sliding tractrix surface, the combination serving as a journal bearing for the entire valve stem and packing assembly. The journal bearing so configured is known as a Schiele's pivot. The Schiele's pivot also serves to maintain proper alignment of the valve stem with respect to the bonnet. Vertical wear between the surfaces of the Schiele's pivot is uniform at all points of contact between the second sliding tractrix surface and the second complementary tractrix surface of a bonnet. The valve stem is connected to a valve plug by means of a slip joint. The valve is opened and closed by rotating the valve stem. The slip joint compensates for wear on the Schiele's pivot and on the valve plug. A ledge is provided on the valve bonnet for the retaining nut to bear against. The ledge prevents overtightening of the retaining nut and the resulting excessive friction between stem and stem packing.

  8. Depressurization valve

    DOE Patents [OSTI]

    Skoda, G.I.

    1989-03-28T23:59:59.000Z

    A depressurization valve for use in relieving completely the pressure in a simplified boiling water reactor is disclosed. The normally closed and sealed valve is provided with a valve body defining a conduit from an outlet of a manifold from the reactor through a valve seat. A closing valve disk is configured for fitting to the valve seat to normally close the valve. The seat below the disk is provided with a radially extending annulus extending a short distance into the aperture defined by the seat. The disk is correspondingly provided with a longitudinally extending annulus that extends downwardly through the aperture defined by the seat towards the high pressure side of the valve body. A ring shaped membrane is endlessly welded to the seat annulus and to the disk annulus. The membrane is conformed over the confronted surface of the seat and disk in a C-sectioned configuration to seal the depressurization valve against the possibility of weeping. The disk is held to the closed position by an elongate stem extending away from the high pressure side of the valve body. The stem has a flange configured integrally to the stem for bias by two springs. The first spring acts from a portion of the housing overlying the disk on the stem flange adjacent the disk. This spring urges the stem and attached disk away from the seat and thus will cause the valve to open at any pressure. A second spring-preferably of the Belleville variety-acts on a latch plate surrounding and freely moving relative to the end of the stem. This second spring overcomes the bias of the first spring and any pressure acting upon the disk. This Belleville spring maintains through its spring force the valve in the closed position. At the same time, the latch plate with its freedom of movement relative to the stem allows the stem to thermally expand during valve temperature excursion.

  9. Nuclear radiation actuated valve

    DOE Patents [OSTI]

    Christiansen, David W. (Kennewick, WA); Schively, Dixon P. (Richland, WA)

    1985-01-01T23:59:59.000Z

    A nuclear radiation actuated valve for a nuclear reactor. The valve has a valve first part (such as a valve rod with piston) and a valve second part (such as a valve tube surrounding the valve rod, with the valve tube having side slots surrounding the piston). Both valve parts have known nuclear radiation swelling characteristics. The valve's first part is positioned to receive nuclear radiation from the nuclear reactor's fuel region. The valve's second part is positioned so that its nuclear radiation induced swelling is different from that of the valve's first part. The valve's second part also is positioned so that the valve's first and second parts create a valve orifice which changes in size due to the different nuclear radiation caused swelling of the valve's first part compared to the valve's second part. The valve may be used in a nuclear reactor's core coolant system.

  10. Variable Valve Actuation

    SciTech Connect (OSTI)

    Jeffrey Gutterman; A. J. Lasley

    2008-08-31T23:59:59.000Z

    Many approaches exist to enable advanced mode, low temperature combustion systems for diesel engines - such as premixed charge compression ignition (PCCI), Homogeneous Charge Compression Ignition (HCCI) or other HCCI-like combustion modes. The fuel properties and the quantity, distribution and temperature profile of air, fuel and residual fraction in the cylinder can have a marked effect on the heat release rate and combustion phasing. Figure 1 shows that a systems approach is required for HCCI-like combustion. While the exact requirements remain unclear (and will vary depending on fuel, engine size and application), some form of substantially variable valve actuation is a likely element in such a system. Variable valve actuation, for both intake and exhaust valve events, is a potent tool for controlling the parameters that are critical to HCCI-like combustion and expanding its operational range. Additionally, VVA can be used to optimize the combustion process as well as exhaust temperatures and impact the after treatment system requirements and its associated cost. Delphi Corporation has major manufacturing and product development and applied R&D expertise in the valve train area. Historical R&D experience includes the development of fully variable electro-hydraulic valve train on research engines as well as several generations of mechanical VVA for gasoline systems. This experience has enabled us to evaluate various implementations and determine the strengths and weaknesses of each. While a fully variable electro-hydraulic valve train system might be the 'ideal' solution technically for maximum flexibility in the timing and control of the valve events, its complexity, associated costs, and high power consumption make its implementation on low cost high volume applications unlikely. Conversely, a simple mechanical system might be a low cost solution but not deliver the flexibility required for HCCI operation. After modeling more than 200 variations of the mechanism it was determined that the single cam design did not have enough flexibility to satisfy three critical OEM requirements simultaneously, (maximum valve lift variation, intake valve opening timing and valve closing duration), and a new approach would be necessary. After numerous internal design reviews including several with the OEM a dual cam design was developed that had the flexibility to meet all motion requirements. The second cam added complexity to the mechanism however the cost was offset by the deletion of the electric motor required in the previous design. New patent applications including detailed drawings and potential valve motion profiles were generated and alternate two cam designs were proposed and evaluated for function, cost, reliability and durability. Hardware was designed and built and testing of sample hardware was successfully completed on an engine test stand. The mechanism developed during the course of this investigation can be applied by Original Equipment Manufacturers, (OEM), to their advanced diesel engines with the ultimate goal of reducing emissions and improving fuel economy. The objectives are: (1) Develop an optimal, cost effective, variable valve actuation (VVA) system for advanced low temperature diesel combustion processes. (2) Design and model alternative mechanical approaches and down-select for optimum design. (3) Build and demonstrate a mechanism capable of application on running engines.

  11. Piezoelectric valve

    DOE Patents [OSTI]

    Petrenko, Serhiy Fedorovich

    2013-01-15T23:59:59.000Z

    A motorized valve has a housing having an inlet and an outlet to be connected to a pipeline, a saddle connected with the housing, a turn plug having a rod, the turn plug cooperating with the saddle, and a drive for turning the valve body and formed as a piezoelectric drive, the piezoelectric drive including a piezoelectric generator of radially directed standing acoustic waves, which is connected with the housing and is connectable with a pulse current source, and a rotor operatively connected with the piezoelectric generator and kinematically connected with the rod of the turn plug so as to turn the turn plug when the rotor is actuated by the piezoelectric generator.

  12. Artificial Heart Valve Design

    E-Print Network [OSTI]

    Provancher, William

    Artificial Heart Valve Design Your Chance to be a Biomedical Engineer #12;Circulatory System Video #12;What is a Heart Valve? · Heart Valve Video #12;#12;What Does a Heart Valve Do? · Maintain the one direction flow of blood through the heart · Heart valves allow blood to flow through in a forward direction

  13. Germanium Nanowire Spin-Valve Device (DMR-0819860)

    E-Print Network [OSTI]

    Petta, Jason

    Germanium Nanowire Spin-Valve Device (DMR-0819860) E-S Liu, J. Nah, K.Varahramyan, and E. Tutuc (Univ. of Texas at Austin) Figure 1 The spin-valve device comprised of a Ge nanowire bracketed by two in direction, the spin current is suppressed (spin-valve action). An applied magnetic field By is used

  14. OPTIMIZATION OF AUTOMOTIVE VALVE TRAIN COMPONENTS WITH IMPLICT FILTERING \\Lambda

    E-Print Network [OSTI]

    OPTIMIZATION OF AUTOMOTIVE VALVE TRAIN COMPONENTS WITH IMPLICT FILTERING \\Lambda T. D. CHOI y , O identification and optimization in automotive valve train design. We extend our previous work by using a more refined model of the valve train and exploiting parallelism in a new way. We apply the parameter

  15. Rotary pneumatic valve

    DOE Patents [OSTI]

    Hardee, Harry C. (Albuquerque, NM)

    1991-01-01T23:59:59.000Z

    A rotary pneumatic valve which is thrust balanced and the pneumatic pressure developed produces only radial loads on the valve cylinder producing negligible resistance and thus minimal torque on the bearings of the valve. The valve is multiplexed such that at least two complete switching cycles occur for each revolution of the cylinder spindle.

  16. Vacuum breaker valve assembly

    DOE Patents [OSTI]

    Thompson, Jeffrey L. (San Jose, CA); Upton, Hubert Allen (Morgan Hill, CA)

    1999-04-27T23:59:59.000Z

    Breaker valve assemblies for a simplified boiling water nuclear reactor are described. The breaker valve assembly, in one form, includes a valve body and a breaker valve. The valve body includes an interior chamber, and an inlet passage extends from the chamber and through an inlet opening to facilitate transporting particles from outside of the valve body to the interior chamber. The breaker valve is positioned in the chamber and is configured to substantially seal the inlet opening. Particularly, the breaker valve includes a disk which is sized to cover the inlet opening. The disk is movably coupled to the valve body and is configured to move substantially concentrically with respect to the valve opening between a first position, where the disk completely covers the inlet opening, and a second position, where the disk does not completely cover the inlet opening.

  17. Vacuum breaker valve assembly

    DOE Patents [OSTI]

    Thompson, J.L.; Upton, H.A.

    1999-04-27T23:59:59.000Z

    Breaker valve assemblies for a simplified boiling water nuclear reactor are described. The breaker valve assembly, in one form, includes a valve body and a breaker valve. The valve body includes an interior chamber, and an inlet passage extends from the chamber and through an inlet opening to facilitate transporting particles from outside of the valve body to the interior chamber. The breaker valve is positioned in the chamber and is configured to substantially seal the inlet opening. Particularly, the breaker valve includes a disk which is sized to cover the inlet opening. The disk is movably coupled to the valve body and is configured to move substantially concentrically with respect to the valve opening between a first position, where the disk completely covers the inlet opening, and a second position, where the disk does not completely cover the inlet opening. 1 fig.

  18. Bellows sealed plug valve

    DOE Patents [OSTI]

    Dukas, Jr., Stephen J. (Idaho Falls, ID)

    1990-01-01T23:59:59.000Z

    A bellows sealed plug valve includes a valve body having an inlet passage and an outlet passage, a valve chamber between the inlet and outlet passages. A valve plug has substantially the same shape as the valve chamber and is rotatably disposed therein. A shaft is movable linearly in response to a signal from a valve actuator. A bellows is sealingly disposed between the valve chamber and the valve actuator and means are located between the bellows and the valve plug for converting linear movement of the shaft connected to the valve actuator to rotational movement of the plug. Various means are disclosed including helical thread mechanism, clevis mechanism and rack and pinion mechanism, all for converting linear motion to rotational motion.

  19. Scissor thrust valve actuator

    DOE Patents [OSTI]

    DeWall, Kevin G.; Watkins, John C; Nitzel, Michael E.

    2006-08-29T23:59:59.000Z

    Apparatus for actuating a valve includes a support frame and at least one valve driving linkage arm, one end of which is rotatably connected to a valve stem of the valve and the other end of which is rotatably connected to a screw block. A motor connected to the frame is operatively connected to a motor driven shaft which is in threaded screw driving relationship with the screw block. The motor rotates the motor driven shaft which drives translational movement of the screw block which drives rotatable movement of the valve driving linkage arm which drives translational movement of the valve stem. The valve actuator may further include a sensory control element disposed in operative relationship with the valve stem, the sensory control element being adapted to provide control over the position of the valve stem by at least sensing the travel and/or position of the valve stem.

  20. Valve for fluid control

    DOE Patents [OSTI]

    Oborny, Michael C. (Albuquerque, NM); Paul, Phillip H. (Livermore, CA); Hencken, Kenneth R. (Pleasanton, CA); Frye-Mason, Gregory C. (Cedar Crest, NM); Manginell, Ronald P. (Albuquerque, NM)

    2001-01-01T23:59:59.000Z

    A valve for controlling fluid flows. This valve, which includes both an actuation device and a valve body provides: the ability to incorporate both the actuation device and valve into a unitary structure that can be placed onto a microchip, the ability to generate higher actuation pressures and thus control higher fluid pressures than conventional microvalves, and a device that draws only microwatts of power. An electrokinetic pump that converts electric potential to hydraulic force is used to operate, or actuate, the valve.

  1. Ball valve extractor

    DOE Patents [OSTI]

    Herndon, Charles (Walterboro, SC); Brown, Roger A. (North Augusta, SC)

    2002-01-01T23:59:59.000Z

    An apparatus and process for removing a ball valve is provided. The ball valve removal tool provides a handle sliding along the length of a shaft. One end of the shaft is secured within an interior cavity of a ball valve while the opposite end of the shaft defines a stop member. By providing a manual sliding force to the handle, the handle impacts the stop member and transmits the force to the ball valve. The direction of the force is along the shaft of the removal tool and disengages the ball valve from the ball valve housing.

  2. Apply

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office511041cloth DocumentationProductsAlternative FuelsSanta3Appliance andApplicationBerkeleyAppliedApply

  3. Microblower assisted barometric valve

    SciTech Connect (OSTI)

    Rossabi, Joseph; Hyde, Warren K.; Riha, Brian D.; Jackson, Dennis G.; Sappington, Frank

    2005-12-06T23:59:59.000Z

    A gas exchange apparatus is provided which provides for both passive fluid flow and blower associated fluid flow through a barometric valve. A battery powered blower is provided which allows for operation of the barometric valve during times when the barometric valve would otherwise be closed, and provides for enhanced volume of gas exchange.

  4. Non-plugging injection valve

    DOE Patents [OSTI]

    Carey, Jr., Henry S. (Wilsonville, AL)

    1985-01-01T23:59:59.000Z

    A valve for injecting fluid into a conduit carrying a slurry subject to separation to form deposits capable of plugging openings into the conduit. The valve comprises a valve body that is sealed to the conduit about an aperture formed through the wall of the conduit to receive the fluid to be injected and the valve member of the valve includes a punch portion that extends through the injection aperture to the flow passage, when the valve is closed, to provide a clear channel into the conduit, when the valve is opened, through deposits which might have formed on portions of the valve adjacent the conduit.

  5. Diagnostic for two-mode variable valve activation device

    DOE Patents [OSTI]

    Fedewa, Andrew M

    2014-01-07T23:59:59.000Z

    A method is provided for diagnosing a multi-mode valve train device which selectively provides high lift and low lift to a combustion valve of an internal combustion engine having a camshaft phaser actuated by an electric motor. The method includes applying a variable electric current to the electric motor to achieve a desired camshaft phaser operational mode and commanding the multi-mode valve train device to a desired valve train device operational mode selected from a high lift mode and a low lift mode. The method also includes monitoring the variable electric current and calculating a first characteristic of the parameter. The method also includes comparing the calculated first characteristic against a predetermined value of the first characteristic measured when the multi-mode valve train device is known to be in the desired valve train device operational mode.

  6. OPTIMIZATION OF AUTOMOTIVE VALVE TRAIN COMPONENTS WITH IMPLICT , O. J. ELSINGER

    E-Print Network [OSTI]

    OPTIMIZATION OF AUTOMOTIVE VALVE TRAIN COMPONENTS WITH IMPLICT FILTERING T. D. CHOI ¡ , O. J and optimization in automotive valve train design. We extend our previous work by using a more refined model of the valve train and exploiting parallelism in a new way. We apply the parameter identification results

  7. Mesofluidic two stage digital valve

    DOE Patents [OSTI]

    Jansen, John F; Love, Lonnie J; Lind, Randall F; Richardson, Bradley S

    2013-12-31T23:59:59.000Z

    A mesofluidic scale digital valve system includes a first mesofluidic scale valve having a valve body including a bore, wherein the valve body is configured to cooperate with a solenoid disposed substantially adjacent to the valve body to translate a poppet carried within the bore. The mesofluidic scale digital valve system also includes a second mesofluidic scale valve disposed substantially perpendicular to the first mesofluidic scale valve. The mesofluidic scale digital valve system further includes a control element in communication with the solenoid, wherein the control element is configured to maintain the solenoid in an energized state for a fixed period of time to provide a desired flow rate through an orifice of the second mesofluidic valve.

  8. A hybrid tissue-engineered heart valve

    E-Print Network [OSTI]

    Alavi, SH; Kheradvar, A

    2015-01-01T23:59:59.000Z

    integrity of the engineered valve when sub- jected to theto engineering heart valves holds promise for combining thebility of mechanical valves with the improved biocompat-

  9. Torque limited drive for manual valves

    DOE Patents [OSTI]

    Elliott, Philip G. (Metropolis, IL); Underwood, Daniel E. (Paducah, KY)

    1989-01-01T23:59:59.000Z

    The present invention is directed to a torque-limiting handwheel device for preventing manual valves from being damaged due to the application of excessive torque during the opening or closing operation of the valves. Torque can only be applied when ridges in the handwheel assembly engage in channels machined in the face of the baseplate. The amount of torque required for disengagement of the ridges from the channels is determined by the force exerted by various Bellville springs and the inclination of the side faces of the channels.

  10. Valve for gas centrifuges

    DOE Patents [OSTI]

    Hahs, Charles A. (Oak Ridge, TN); Burbage, Charles H. (Oak Ridge, TN)

    1984-01-01T23:59:59.000Z

    The invention is a pneumatically operated valve assembly for simultaneously (1) closing gas-transfer lines connected to a gas centrifuge or the like and (2) establishing a recycle path between two of the lines so closed. The valve assembly is especially designed to be compact, fast-acting, reliable, and comparatively inexpensive. It provides large reductions in capital costs for gas-centrifuge cascades.

  11. CX-011143: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Replace River Water Pelton Valves and Remove Existing Valve Houses CX(s) Applied: B1.3. Date: 08/21/2013 Location(s): South Carolina Offices(s): Savannah River Operations Office

  12. Well valve control system

    SciTech Connect (OSTI)

    Schwendemann, K.L.; McCracken, O.W.; Mondon, C.G.; Wortham, L.C.

    1987-01-13T23:59:59.000Z

    A system is described for controlling well testing through an upper and lower test string with a subsea test tree connected therebetween and latch means to release the upper test string from the subsea test tree comprising: a. first and second selectively programmable microprocessor means; b. means for storing system operating limits in each microprocessor means; c. means for changing the operating limits in response to changes in well conditions; d. means for communicating operating fluid pressure to the subsurface test tree and the latch means; e. solenoid pilot valves controlling the flow of the operating fluid pressure to the subsea test tree and the latch means; f. the first microprocessor means located at a central control console; g. the second microprocessor means located near the solenoid valves; h. means for transmitting signals between the first and second microprocessor means and validating the accuracy of the signals; and i. electronic circuits to control operation of the solenoid valves in response to validated signals.

  13. Self-regulating valve

    DOE Patents [OSTI]

    Humphreys, D.A.

    1982-07-20T23:59:59.000Z

    A variable, self-regulating valve having a hydraulic loss coefficient proportional to a positive exponential power of the flow rate. The device includes two objects in a flow channel and structure which assures that the distance between the two objects is an increasing function of the flow rate. The range of spacing between the objects is such that the hydraulic resistance of the valve is an increasing function of the distance between the two objects so that the desired hydraulic loss coefficient as a function of flow rate is obtained without variation in the flow area.

  14. Valve for gas centrifuges

    DOE Patents [OSTI]

    Hahs, C.A.; Rurbage, C.H.

    1982-03-17T23:59:59.000Z

    The invention is pneumatically operated valve assembly for simulatenously (1) closing gas-transfer lines connected to a gas centrifuge or the like and (2) establishing a recycle path between two on the lines so closed. The value assembly is especially designed to be compact, fast-acting, reliable, and comparatively inexpensive. It provides large reductions in capital costs for gas-centrifuge cascades.

  15. Thermostatic Radiator Valve Evaluation

    SciTech Connect (OSTI)

    Dentz, Jordan [Advanced Residential Integrated Energy Solutions Collaborative, New York, NY (United States); Ansanelli, Eric [Advanced Residential Integrated Energy Solutions Collaborative, New York, NY (United States)

    2015-01-01T23:59:59.000Z

    A large stock of multifamily buildings in the Northeast and Midwest are heated by steam distribution systems. Losses from these systems are typically high and a significant number of apartments are overheated much of the time. Thermostatically controlled radiator valves (TRVs) are one potential strategy to combat this problem, but have not been widely accepted by the residential retrofit market.

  16. Multi-port valve assembly

    DOE Patents [OSTI]

    Guggenheim, S. Frederic (Teaneck, NJ)

    1986-01-01T23:59:59.000Z

    A multi-port fluid valve apparatus is used to control the flow of fluids through a plurality of valves and includes a web, which preferably is a stainless steel endless belt. The belt has an aperture therethrough and is progressed, under motor drive and control, so that its aperture is moved from one valve mechanism to another. Each of the valve mechanisms comprises a pair of valve blocks which are held in fluid-tight relationship against the belt. Each valve block consists of a block having a bore through which the fluid flows, a first seal surrounding the bore and a second seal surrounding the first seal, with the distance between the first and second seals being greater than the size of the belt aperture. In order to open a valve, the motor progresses the belt aperture to where it is aligned with the two bores of a pair of valve blocks, such alignment permitting a flow of the fluid through the valve. The valve is closed by movement of the belt aperture and its replacement, within the pair of valve blocks, by a solid portion of the belt.

  17. Micro-valve pump light valve display

    DOE Patents [OSTI]

    Yeechun Lee.

    1993-01-19T23:59:59.000Z

    A flat panel display incorporates a plurality of micro-pump light valves (MLV's) to form pixels for recreating an image. Each MLV consists of a dielectric drop sandwiched between substrates, at least one of which is transparent, a holding electrode for maintaining the drop outside a viewing area, and a switching electrode from accelerating the drop from a location within the holding electrode to a location within the viewing area. The sustrates may further define non-wetting surface areas to create potential energy barriers to assist in controlling movement of the drop. The forces acting on the drop are quadratic in nature to provide a nonlinear response for increased image contrast. A crossed electrode structure can be used to activate the pixels whereby a large flat panel display is formed without active driver components at each pixel.

  18. Emerging Trends in Heart Valve Engineering: Part III. Novel Technologies for Mitral Valve Repair and Replacement.

    E-Print Network [OSTI]

    2015-01-01T23:59:59.000Z

    of commercial bioprosthetic heart valves. Ann. Thorac. Surg.mechanics of arti?cial heart valves. Clin. Exp. Pharmacol.with the ATS bilea?et valve. J. Heart Valve Dis. 18:445–452,

  19. Fast acting multiple element valve

    DOE Patents [OSTI]

    Yang, Jefferson Y. S. (Orange, CA); Wada, James M. (Torrance, CA)

    1991-01-01T23:59:59.000Z

    A plurality of slide valve elements having plural axial-spaced annular parts and an internal slide are inserted into a bulkhead in a fluid conduit from a downstream side of the bulkhead, locked in place by a bayonet coupling and set screw, and project through the bulkhead into the upstream conduit. Pneumatic lines connecting the slide valve element actuator to pilot valves are brought out the throat of the valve element to the downstream side. Pilot valves are radially spaced around the exterior of the valve to permit the pneumatic lines to be made identical, thereby to minimize adverse timing tolerances in operation due to pressure variations. Ring manifolds surround the valve adjacent respective pilot valve arrangements to further reduce adverse timing tolerances due to pressure variations, the manifolds being directly connected to the respective pilot valves. Position sensors are provided the valve element slides to signal the precise time at which a slide reaches or passes through a particular point in its stroke to initiate a calibrated timing function.

  20. Fast-acting valve and uses thereof

    DOE Patents [OSTI]

    Meyer, J.A.

    1980-05-16T23:59:59.000Z

    A very fast acting valve capable of producing a very well-defined plug of gas suitable for filling a theta pinch vacuum vessel is given. The valve requires no springs, instead being stopped mainly by a nonlinear force. Thus, the valve is not subject to bouncing; and the ratio of the size of the valve housing to the size of the valve stem is smaller than it would be if springs were needed to stop the valve stem. Furthermore, the valve can be used for thousands of valve firings with no apparent valve damage.

  1. Fast-acting valve and uses thereof

    DOE Patents [OSTI]

    Meyer, James A. (Espanola, NM)

    1982-01-01T23:59:59.000Z

    A very fast acting valve capable of producing a very well-defined plug of gas suitable for filling a theta pinch vacuum vessel is given. The valve requires no springs, instead being stopped mainly by a nonlinear force. Thus, the valve is not subject to bouncing; and the ratio of the size of the valve housing to the size of the valve stem is smaller than it would be if springs were needed to stop the valve stem. Furthermore, the valve can be used for thousands of valve firings with no apparent valve damage.

  2. CONTROL VALVE TESTING PROCEDURES AND EQUATIONS

    E-Print Network [OSTI]

    Rahmeyer, William J.

    APPENDIX A CONTROL VALVE TESTING PROCEDURES AND EQUATIONS FOR LIQUID FLOWS #12;APPENDIX A CONTROL VALVE TESTING PROCEDURES AND EQUATIONS FOR LIQUID FLOWS 2 Cv Q P Sg net gpm net = / Cv = Q P / Sg 75 is used to relate the pressure loss of a valve to the discharge of the valve at a given valve opening

  3. Performance Characteristics of an Isothermal Freeze Valve

    SciTech Connect (OSTI)

    Hailey, A.E.

    2001-08-22T23:59:59.000Z

    This document discusses performance characteristics of an isothermal freeze valve. A freeze valve has been specified for draining the DWPF melter at the end of its lifetime. Two freeze valve designs have been evaluated on the Small Cylindrical Melter-2 (SCM-2). In order to size the DWPF freeze valve, the basic principles governing freeze valve behavior need to be identified and understood.

  4. NONLINEAR MAGNETIC LEVITATION OF AUTOMOTIVE ENGINE VALVES

    E-Print Network [OSTI]

    Grizzle, Jessy W.

    NONLINEAR MAGNETIC LEVITATION OF AUTOMOTIVE ENGINE VALVES K. Peterson, J.W. Grizzle, and A, the controller is designed for and implemented on an electromagnetic valve actuator for use in automotive engines on an electromagnetic valve actuator for use in the actuation of automotive engine valves. 2. ELECTROMAGNETIC VALVE

  5. Advanced thyristor valve project

    SciTech Connect (OSTI)

    Flairty, C. (General Electric Co., Malvern, PA (USA))

    1991-04-01T23:59:59.000Z

    An advanced thyristor value was developed HVDC conversion applications. New features incorporated in the design include: improved heat transfer from the thyristors, two phase cooling of components, and light firing required the development of both a separate light triggered thyristor with a full forward blocking voltage rating and a special flash lamp employing cesium vapor as the associated light source. A valve rated 133 kV and 2200 A bridge current was constructed and lab tested before shipment to the Sylmar Converter Station, which is the southern terminus of the Pacific DC Intertie. The Los Angeles Department of Water and Power, which operates the Sylmar Station, installed the valve and operated it to gain experience. 36 figs., 5 tabs.

  6. Advanced thyristor valve project

    SciTech Connect (OSTI)

    Damsky, B.L.

    1984-01-01T23:59:59.000Z

    General Electrics's thyristor valve project incorporates the most advanced technologies available. With joint funding from the Electric Power Research Institute, commercial application of the separate light-triggered thyristor is now underway. The cesium vapor lamp source to trigger the light sensitive thyristors will reduce component complexity and cost. A unique thermal management feature relies on forced vaporization cooling with Freon-113, which equals the thermal performance of water without posing insulation reliability problems. 7 figures.

  7. FLUID-STRUCTURE INTERACTION MODELS OF THE MITRAL VALVE: FUNCTION IN NORMAL AND PATHOLOGIC STATES

    SciTech Connect (OSTI)

    Kunzelman, K. S.; Einstein, Daniel R.; Cochran, R. P.

    2007-08-29T23:59:59.000Z

    Successful mitral valve repair is dependent upon a full understanding of normal and abnormal mitral valve anatomy and function. Computational analysis is one such method that can be applied to simulate mitral valve function in order to analyze the roles of individual components, and evaluate proposed surgical repair. We developed the first three-dimensional, finite element (FE) computer model of the mitral valve including leaflets and chordae tendineae, however, one critical aspect that has been missing until the last few years was the evaluation of fluid flow, as coupled to the function of the mitral valve structure. We present here our latest results for normal function and specific pathologic changes using a fluid-structure interaction (FSI) model. Normal valve function was first assessed, followed by pathologic material changes in collagen fiber volume fraction, fiber stiffness, fiber splay, and isotropic stiffness. Leaflet and chordal stress and strain, and papillary muscle force was determined. In addition, transmitral flow, time to leaflet closure, and heart valve sound were assessed. Model predictions in the normal state agreed well with a wide range of available in-vivo and in-vitro data. Further, pathologic material changes that preserved the anisotropy of the valve leaflets were found to preserve valve function. By contrast, material changes that altered the anisotropy of the valve were found to profoundly alter valve function. The addition of blood flow and an experimentally driven microstructural description of mitral tissue represent significant advances in computational studies of the mitral valve, which allow further insight to be gained. This work is another building block in the foundation of a computational framework to aid in the refinement and development of a truly noninvasive diagnostic evaluation of the mitral valve. Ultimately, it represents the basis for simulation of surgical repair of pathologic valves in a clinical and educational setting.

  8. Streamline coal slurry letdown valve

    DOE Patents [OSTI]

    Platt, Robert J. (Dover, NJ); Shadbolt, Edward A. (Basking Ridge, NJ)

    1983-01-01T23:59:59.000Z

    A streamlined coal slurry letdown valve is featured which has a two-piece throat comprised of a seat and seat retainer. The two-piece design allows for easy assembly and disassembly of the valve. A novel cage holds the two-piece throat together during the high pressure letdown. The coal slurry letdown valve has long operating life as a result of its streamlined and erosion-resistance surfaces.

  9. Streamline coal slurry letdown valve

    SciTech Connect (OSTI)

    Platt, R.J.; Shadbolt, E.A.

    1983-11-08T23:59:59.000Z

    A streamlined coal slurry letdown valve is featured which has a two-piece throat comprised of a seat and seat retainer. The two-piece design allows for easy assembly and disassembly of the valve. A novel cage holds the two-piece throat together during the high pressure letdown. The coal slurry letdown valve has long operating life as a result of its streamlined and erosion-resistance surfaces. 5 figs.

  10. Semi-active compressor valve

    DOE Patents [OSTI]

    Brun, Klaus (Helotes, TX); Gernentz, Ryan S. (San Antonio, TX)

    2010-07-27T23:59:59.000Z

    A method and system for fine-tuning the motion of suction or discharge valves associated with cylinders of a reciprocating gas compressor, such as the large compressors used for natural gas transmission. The valve's primary driving force is conventional, but the valve also uses an electromagnetic coil to sense position of the plate (or other plugging element) and to provide an opposing force prior to impact.

  11. Low energy high pressure miniature screw valve

    DOE Patents [OSTI]

    Fischer, Gary J. (Sandia Park, NM); Spletzer, Barry L. (Albuquerque, NM)

    2006-12-12T23:59:59.000Z

    A low energy high pressure screw valve having a valve body having an upper portion and a lower portion, said lower portion of said valve body defining an inlet flow passage and an outlet flow passage traversing said valve body to a valve seat, said upper portion of said valve body defining a cavity at said valve seat, a diaphragm restricting flow between said upper portion of said valve body and said lower portion, said diaphragm capable of engaging said valve seat to restrict fluid communication between said inlet passage and said outlet passage, a plunger within said cavity supporting said diaphragm, said plunger being capable of engaging said diaphragm with said valve seat at said inlet and outlet fluid passages, said plunger being in point contact with a drive screw having threads engaged with opposing threads within said upper portion of said valve body such engagement allowing motion of said drive screw within said valve body.

  12. A FAST OPENING TOROIDAL GAS VALVE

    E-Print Network [OSTI]

    Myers, B.R.

    2012-01-01T23:59:59.000Z

    FIGURE 1. Artists sketch of valve illustrating the dynamicsCross sectional view of valve. FIGURE 3. Oscilloscope recordcm (b) Gauge 5.0 em from valve Top trace; gauge, 0.5 volts/

  13. Valving for controlling a fluid-driven reciprocating apparatus

    DOE Patents [OSTI]

    Whitehead, John C. (Davis, CA)

    1995-01-01T23:59:59.000Z

    A pair of control valve assemblies for alternately actuating a pair of fluid-driven free-piston devices by using fluid pressure communication therebetween. Each control valve assembly is switched by a pressure signal depending on the state of its counterpart's piston. The communication logic is arranged to provide overlap of the forward strokes of the pistons, so that at least one of the pair will always be pressurized. Thus, uninterrupted pumping of liquid is made possible from a pair of free-piston pumps. In addition, the speed and frequency of piston stroking is entirely dependent on the mechanical power load applied. In the case of a pair of pumps, this enables liquid delivery at a substantially constant pressure over the full range of flow rates, from zero to maximum flow. Each of the valve assemblies uses an intake-exhaust valve and a signal valve with the signal valve of one pump being connected to be pressure responsive to the piston of the opposite cylinder or pump.

  14. Valving for controlling a fluid-driven reciprocating apparatus

    DOE Patents [OSTI]

    Whitehead, J.C.

    1995-06-27T23:59:59.000Z

    A pair of control valve assemblies is described for alternately actuating a pair of fluid-driven free-piston devices by using fluid pressure communication therebetween. Each control valve assembly is switched by a pressure signal depending on the state of its counterpart`s piston. The communication logic is arranged to provide overlap of the forward strokes of the pistons, so that at least one of the pair will always be pressurized. Thus, uninterrupted pumping of liquid is made possible from a pair of free-piston pumps. In addition, the speed and frequency of piston stroking is entirely dependent on the mechanical power load applied. In the case of a pair of pumps, this enables liquid delivery at a substantially constant pressure over the full range of flow rates, from zero to maximum flow. Each of the valve assemblies uses an intake-exhaust valve and a signal valve with the signal valve of one pump being connected to be pressure responsive to the piston of the opposite cylinder or pump. 15 figs.

  15. Annular flow control safety valve

    SciTech Connect (OSTI)

    Black, P.W.; Pringle, R.E.

    1981-06-16T23:59:59.000Z

    A tubular housing having an inner tubular member forms an inner passageway inside of the inner member and an outer passageway between the inner member and the housing. The housing has valve openings leading from the outer passageway to the exterior of the housing and a tubular valve closure member telescopically moves on the interior of the housing. First means move the valve closure member in an upper direction for closing the openings and at least one actuating piston is telescopically movable within and has its longitudinal axis in the wall of the housing and engages the valve closure member. The piston is in communication with a hydraulic passageway adapted to extend to the well surface for actuating the closure member in a direction to open the valve openings. The closure member is positioned whereby upward flow through the outer passageway acts on the closure member to close the valve opening. At least one lockout piston telescopically moves within the housing and is actuated from the surface and is engageable with holding means in the housing for providing a hydraulic lockout for the valve. Shear means may be provided between the lockout piston and the housing for controlling the hydraulic lockout. A single seal is provided between the closure member and the housing and is positioned below the opening and exposed to the pressure on both sides when the valve is opened. Preferably the actuating pistons are connected to the valve closure member but the hydraulic lockout pistons engage but are unconnected to the valve closure member.

  16. Enhancement of nonlocal spin-valve signal using spin accumulation in local spin-valve configuration

    E-Print Network [OSTI]

    Otani, Yoshichika

    Enhancement of nonlocal spin-valve signal using spin accumulation in local spin-valve configuration) We propose a nonlocal spin-valve measurement combined with a local spin-valve structure to enlarge spin signal. The probe configuration consists of a lateral spin valve with three Ni­Fe wires bridged

  17. Heart valve tissue engineering Frank Baaijens

    E-Print Network [OSTI]

    Stavroulakis, Georgios E.

    Heart valve tissue engineering Frank Baaijens Department of Biomedical Engineering Eindhoven University of Technology Netherlands Tissue engineered heart valves appear promising as autologous valvular functionality and durability of the heart valve relies on the strength and anisotropic properties of the valve

  18. Heart Valve Lesson Plan Biomedical Engineering

    E-Print Network [OSTI]

    Provancher, William

    Heart Valve Lesson Plan Biomedical Engineering Objective · Introduce students to biomedical Learning Outcomes · Students will understand the role and function of heart valves. · Students will learn does a heart valve work? · Why do we need to replace heart valves? Time Required (Itemized) · Lecture

  19. Multi-port valve

    DOE Patents [OSTI]

    Lewin, Keith F. (Calverton, NY)

    1997-04-15T23:59:59.000Z

    A multi-port valve for regulating, as a function of ambient air having varying wind velocity and wind direction in an open-field control area, the distribution of a fluid, particularly carbon dioxide (CO.sub.2) gas, in a fluid distribution system so that the control area remains generally at an elevated fluid concentration or level of said fluid. The multi-port valve generally includes a multi-port housing having a plurality of outlets therethrough disposed in a first pattern of outlets and at least one second pattern of outlets, and a movable plate having a plurality of apertures extending therethrough disposed in a first pattern of apertures and at least one second pattern of apertures. The first pattern of apertures being alignable with the first pattern of outlets and the at least one second pattern of apertures being alignable with the second pattern of outlets. The first pattern of apertures has a predetermined orientation with the at least one second pattern of apertures. For an open-field control area subject to ambient wind having a low velocity from any direction, the movable plate is positioned to equally distribute the supply of fluid in a fluid distribution system to the open-field control area. For an open-field control area subject to ambient wind having a high velocity from a given direction, the movable plate is positioned to generally distribute a supply of fluid in a fluid distribution system to that portion of the open-field control area located upwind.

  20. Multi-port valve

    DOE Patents [OSTI]

    Lewin, K.F.

    1997-04-15T23:59:59.000Z

    A multi-port valve is described for regulating, as a function of ambient air having varying wind velocity and wind direction in an open-field control area, the distribution of a fluid, particularly carbon dioxide (CO{sub 2}) gas, in a fluid distribution system so that the control area remains generally at an elevated fluid concentration or level of said fluid. The multi-port valve generally includes a multi-port housing having a plurality of outlets there through disposed in a first pattern of outlets and at least one second pattern of outlets, and a movable plate having a plurality of apertures extending there through disposed in a first pattern of apertures and at least one second pattern of apertures. The first pattern of apertures being alignable with the first pattern of outlets and the at least one second pattern of apertures being alignable with the second pattern of outlets. The first pattern of apertures has a predetermined orientation with the at least one second pattern of apertures. For an open-field control area subject to ambient wind having a low velocity from any direction, the movable plate is positioned to equally distribute the supply of fluid in a fluid distribution system to the open-field control area. For an open-field control area subject to ambient wind having a high velocity from a given direction, the movable plate is positioned to generally distribute a supply of fluid in a fluid distribution system to that portion of the open-field control area located upwind. 7 figs.

  1. Emerging Trends in Heart Valve Engineering: Part III. Novel Technologies for Mitral Valve Repair and Replacement

    E-Print Network [OSTI]

    2015-01-01T23:59:59.000Z

    and J. D. Puskas. Mitral-valve repair versus replacement forbioprosthetic heart valves. Ann. Thorac. Surg. 71:S417–mechanics of arti?cial heart valves. Clin. Exp. Pharmacol.

  2. Emerging Trends in Heart Valve Engineering: Part II. Novel and Standard Technologies for Aortic Valve Replacement

    E-Print Network [OSTI]

    2015-01-01T23:59:59.000Z

    toronto stentless porcine valve. Ann. Thorac. Surg. 78:2076–medical mechanical cardiac valve prosthesis. Ann. Thorac.or surgical aortic-valve replacement. New Engl. J. Med. 366:

  3. Noninvasive valve monitor using alternating electromagnetic field

    DOE Patents [OSTI]

    Eissenberg, David M. (Oak Ridge, TN); Haynes, Howard D. (Knoxville, TN); Casada, Donald A. (Knoxville, TN)

    1993-01-01T23:59:59.000Z

    One or more electrical coils are carefully located on the outside of a valve body. An alternating current passing through the coil(s) results in an alternating electromagnetic field being transmitted into the valve body and valve internals. The electromagnetic field varies in intensity and polarity in the valve. As the position of a valve internal part is changed, the electromagnetic field throughout the valve body and its internals is altered. A passive receiver coil carefully located on the outside of the valve body detects the intensity of the electromagnetic field at that location as an induced electrical voltage in the coil. With the change in position of the valve internal part, there is a corresponding change in the induced voltage as a result of the alteration in the alternating electromagnetic field at that location. Changes in the voltage provide an indication of the position and motion of valve internals.

  4. An electromechanical valve drive incorporating a nonlinear mechanical transformer

    E-Print Network [OSTI]

    Chang, Woo Sok, 1964-

    2003-01-01T23:59:59.000Z

    In traditional internal combustion engines, a camshaft acts on the valve stems to open and close the valves. Valve timing is fixed relative to piston position. On the other hand, if a valve is flexibly controlled by a ...

  5. CX-008868: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Gas Technology Institute- Nano-Valved Adsorbents for CH4 Storage CX(s) Applied: B3.6 Date: 08/20/2012 Location(s): Illinois, Kentucky, South Carolina Offices(s): Advanced Research Projects Agency-Energy

  6. CX-011225: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    West Hackberry RWIS Recycle Valve Upgrade CX(s) Applied: B1.3 Date: 10/15/2013 Location(s): Louisiana Offices(s): Strategic Petroleum Reserve Field Office

  7. CX-012166: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Perform Hydrant Flushing, Maintenance, Prove Curb Valves, and Flow Test in C-Area CX(s) Applied: B1.3 Date: 04/23/2014 Location(s): South Carolina Offices(s): Savannah River Operations Office

  8. CX-010311: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Tank 7 Center Riser Install/Remove Temporary Isolation Valve V-8 CX(s) Applied: B1.3 Date: 04/26/2013 Location(s): South Carolina Offices(s): Savannah River Operations Office

  9. CX-012170: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Install Condensate Release Valves on 108-1K Compressed Air System CX(s) Applied: B1.3 Date: 04/16/2014 Location(s): South Carolina Offices(s): Savannah River Operations Office

  10. American Valve: Order (2010-CW-1411)

    Broader source: Energy.gov [DOE]

    DOE ordered American Valve, Inc. to pay a $5,000 civil penalty after finding American Valve had failed to certify that certain showerhead models comply with the applicable water conservation standards.

  11. Active combustion flow modulation valve

    DOE Patents [OSTI]

    Hensel, John Peter; Black, Nathaniel; Thorton, Jimmy Dean; Vipperman, Jeffrey Stuart; Lambeth, David N; Clark, William W

    2013-09-24T23:59:59.000Z

    A flow modulation valve has a slidably translating hollow armature with at least one energizable coil wound around and fixably attached to the hollow armature. The energizable coil or coils are influenced by at least one permanent magnet surrounding the hollow armature and supported by an outer casing. Lorentz forces on the energizable coils which are translated to the hollow armature, increase or decrease the flow area to provide flow throttling action. The extent of hollow armature translation depends on the value of current supplied and the direction of translation depends on the direction of current flow. The compact nature of the flow modulation valve combined with the high forces afforded by the actuator design provide a flow modulation valve which is highly responsive to high-rate input control signals.

  12. Lockout housing and sleeve for safety valve

    SciTech Connect (OSTI)

    Dickson, R.L.; Davis, G.R.

    1992-07-07T23:59:59.000Z

    This patent describes apparatus for use in a subsurface valve. It comprises a lockout housing; and a lockout sleeve.

  13. Lock open mechanism for downhole safety valve

    SciTech Connect (OSTI)

    Shirk, S.H.

    1990-11-06T23:59:59.000Z

    This patent describes a wireline operable lock open mechanism for use in a downhole safety valve for a subterranean well conduit having an axially shiftable valve member movable downwardly between a closed and an open position relative to the conduit bore and biased to the closed position. The safety valve including a tubular housing assemblage defining an upwardly facing no-go shoulder in its upper end and a downwardly facing locking shoulder in its lower end above the valve member.

  14. Valve for fuel pin loading system

    DOE Patents [OSTI]

    Christiansen, David W. (Kennewick, WA)

    1985-01-01T23:59:59.000Z

    A cyclone valve surrounds a wall opening through which cladding is projected. An axial valve inlet surrounds the cladding. Air is drawn through the inlet by a cyclone stream within the valve. An inflatable seal is included to physically engage a fuel pin subassembly during loading of fuel pellets.

  15. Valve for fuel pin loading system

    DOE Patents [OSTI]

    Christiansen, D.W.

    1984-01-01T23:59:59.000Z

    A cyclone valve surrounds a wall opening through which cladding is projected. An axial valve inlet surrounds the cladding. Air is drawn through the inlet by a cyclone stream within the valve. An inflatable seal is included to physically engage a fuel pin subassembly during loading of fuel pellets.

  16. Flow and Plate Motion in Compressor Valves

    E-Print Network [OSTI]

    Twente, Universiteit

    Flow and Plate Motion in Compressor Valves #12;Flow and Plate Motion in Compressor Valves R.A. Habing Cover Image: 4-stage reciprocating compressor system, Courtesy of Ariel Corporation Thesis.A. Habing, Enschede, The Netherlands #12;FLOW AND PLATE MOTION IN COMPRESSOR VALVES PROEFSCHRIFT ter

  17. Automated Purge Valve Joseph Edward Farrell, III.

    E-Print Network [OSTI]

    Wood, Stephen L.

    Automated Purge Valve by Joseph Edward Farrell, III. Bachelor of Science Marine Engineering the undersigned committee hereby approve the attached thesis Automated Purge Valve by Joseph Edward Farrell, III.D. Department Head Department of Marine and Environmental Systems #12;iii Abstract Title: Automated Purge Valve

  18. STATE OF CALIFORNIA VALVE LEAKAGE TEST

    E-Print Network [OSTI]

    STATE OF CALIFORNIA VALVE LEAKAGE TEST CEC-MECH-8A (Revised 08/09) CALIFORNIA ENERGY COMMISSION CERTIFICATE OF ACCEPTANCE MECH-8A NA7.5.7 Valve Leakage Test (Page 1 of 3) Project Name/Address: System Name VALVE LEAKAGE TEST CEC-MECH-8A (Revised 08/09) CALIFORNIA ENERGY COMMISSION CERTIFICATE OF ACCEPTANCE

  19. Pressure relief valve/safety relief valve testing

    SciTech Connect (OSTI)

    Murray, W.A.; Hamm, E.R.; Barber, J.R.

    1994-02-01T23:59:59.000Z

    Pressure vessels and piping systems are protected form overpressurization by pressure relief valves. These safety features are required to be tested-inspected on some periodic basis and, in most cases witnessed by a third party inspector. As a result nonconformances found by third parties Westinghouse Hanford Company initiated a task team to develop a pressure safety program. This paper reveals their findings.

  20. Valve assembly having remotely replaceable bearings

    DOE Patents [OSTI]

    Johnson, Evan R. (San Diego, CA); Tanner, David E. (Poway, CA)

    1980-01-01T23:59:59.000Z

    A valve assembly having remotely replaceable bearings is disclosed wherein a valve disc is supported within a flow duct for rotation about a pair of axially aligned bearings, one of which is carried by a spindle received within a diametral bore in the valve disc, and the other of which is carried by a bearing support block releasably mounted on the duct circumferentially of an annular collar on the valve disc coaxial with its diametrical bore. The spindle and bearing support block are adapted for remote removal to facilitate servicing or replacement of the valve disc support bearings.

  1. High volume fuel vapor release valve

    SciTech Connect (OSTI)

    Gimby, D.R.

    1991-09-03T23:59:59.000Z

    This patent describes a fuel vapor release valve for use in a vehicle fuel system. It comprises a valve housing 10 placed in a specific longitudinal orientation, the valve housing 10 defining an interior cavity 22 having an inlet 20 for admitting fuel vapor and an outlet 14 for discharging such fuel vapor; a valve member 24 positioned in the cavity 22 for movement between an outlet 14 opening position and an outlet 14 closing position, the valve member 24 including a cap member 34 having a seat surface 36 for mating with the outlet 14 and an orifice 42 extending through the cap member 34 providing a passageway from the outlet 14 to the cavity 22, the orifice 42 extending through the cap member 34 providing a passageway from the outlet 14 to the cavity 22, the orifice 42 having a lesser radius than the outlet 14; the valve member 24 further including a plug member 30 engaged with the cap member 34 for movement between an orifice 42 opening position and an orifice 42 closing position; and, a valve housing tilt responsive means for moving the valve member 24 to an outlet 14 and orifice 42 closing position in response to tilting of the valve 10 about its longitudinal axis whereby, upon the return of the valve 10 to its specified longitudinal orientation, the plug member 30 first moves to an orifice 42 opening position and the cap member 34 subsequently moves to an outlet 14 opening position.

  2. Force measuring valve assemblies, systems including such valve assemblies and related methods

    DOE Patents [OSTI]

    DeWall, Kevin George (Pocatello, ID); Garcia, Humberto Enrique (Idaho Falls, ID); McKellar, Michael George (Idaho Falls, ID)

    2012-04-17T23:59:59.000Z

    Methods of evaluating a fluid condition may include stroking a valve member and measuring a force acting on the valve member during the stroke. Methods of evaluating a fluid condition may include measuring a force acting on a valve member in the presence of fluid flow over a period of time and evaluating at least one of the frequency of changes in the measured force over the period of time and the magnitude of the changes in the measured force over the period of time to identify the presence of an anomaly in a fluid flow and, optionally, its estimated location. Methods of evaluating a valve condition may include directing a fluid flow through a valve while stroking a valve member, measuring a force acting on the valve member during the stroke, and comparing the measured force to a reference force. Valve assemblies and related systems are also disclosed.

  3. Miniature electrically operated diaphragm valve

    DOE Patents [OSTI]

    Adkins, Douglas R. (Albuquerque, NM); Spletzer, Barry L. (Albuquerque, NM); Wong, Chungnin C. (Albuquerque, NM); Frye-Mason, Gregory C. (Cedar Crest, NM); Fischer, Gary J. (Albuquerque, NM); Hesketh, Peter J. (Atlanta, GA)

    2001-01-01T23:59:59.000Z

    The present invention provides a miniature electrically operated valve that can stand off significant pressures, that can be inexpensively produced, and that can be made to operate without continuous electrical power. A valve according to the present invention comprises a housing and a beam mounted with the housing. A diaphragm mounted with the housing forms a sealed fluid volume. An electromagnetic energy source, such as an electromagnetic coil, mounts with the housing and when energized urges the beam in one direction. The beam can be urged in the opposing direction by passive means or by reversing the polarity of the electromagnetic energy source or by a second electromagnetic energy source. Two fluid ports mount with the housing. A first fluid port mounts so that, as the beam is urged in one direction or the opposite, the beam urges the diaphragm to move between engaging and substantially sealing the fluid port and disengaging and not substantially sealing the fluid port. A seat can be mounted with the diaphragm to aid in sealing the fluid port. Latching mechanisms such as permanent magnets can be mounted so that the valve remains in the open or closed positions without continuous electrical power input. Fluid can flow through the housing between the two fluid ports when the diaphragm does not seal the first fluid port, but can be prevented from flowing by urging the beam so that the diaphragm seals the first fluid port. Various embodiments accommodate various latching mechanisms, electromagnetic energy sources, number of fluid ports, and diaphragm design considerations.

  4. Miniature piezo electric vacuum inlet valve

    DOE Patents [OSTI]

    Keville, Robert F. (Valley Springs, CA); Dietrich, Daniel D. (Livermore, CA)

    1998-03-24T23:59:59.000Z

    A miniature piezo electric vacuum inlet valve having a fast pulse rate and is battery operated with variable flow capability. The low power (<1.6 watts), high pulse rate (<2 milliseconds), variable flow inlet valve is utilized for mass spectroscopic applications or other applications where pulsed or continuous flow conditions are needed. The inlet valve also has a very minimal dead volume of less than 0.01 std/cc. The valve can utilize, for example, a 12 Vdc input/750 Vdc, 3 mA output power supply compared to conventional piezo electric valves which require preloading of the crystal drive mechanism and 120 Vac, thus the valve of the present invention is smaller by a factor of three.

  5. Miniature piezo electric vacuum inlet valve

    DOE Patents [OSTI]

    Keville, R.F.; Dietrich, D.D.

    1998-03-24T23:59:59.000Z

    A miniature piezo electric vacuum inlet valve having a fast pulse rate and is battery operated with variable flow capability is disclosed. The low power (<1.6 watts), high pulse rate (<2 milliseconds), variable flow inlet valve is utilized for mass spectroscopic applications or other applications where pulsed or continuous flow conditions are needed. The inlet valve also has a very minimal dead volume of less than 0.01 std/cc. The valve can utilize, for example, a 12 Vdc input/750 Vdc, 3 mA output power supply compared to conventional piezo electric valves which require preloading of the crystal drive mechanism and 120 Vac, thus the valve of the present invention is smaller by a factor of three. 6 figs.

  6. Propellant actuated nuclear reactor steam depressurization valve

    DOE Patents [OSTI]

    Ehrke, Alan C. (San Jose, CA); Knepp, John B. (San Jose, CA); Skoda, George I. (Santa Clara, CA)

    1992-01-01T23:59:59.000Z

    A nuclear fission reactor combined with a propellant actuated depressurization and/or water injection valve is disclosed. The depressurization valve releases pressure from a water cooled, steam producing nuclear reactor when required to insure the safety of the reactor. Depressurization of the reactor pressure vessel enables gravity feeding of supplementary coolant water through the water injection valve to the reactor pressure vessel to prevent damage to the fuel core.

  7. Materials for Advanced Engine Valve Train

    Broader source: Energy.gov (indexed) [DOE]

    275,000 * FY11 Funding - 225,000 Budget * Changes in internal combustion regimes * Materials properties of exhaust valves will need to change to accommodate higher temperatures...

  8. American Valve: Proposed Penalty (2010-CW-1411)

    Broader source: Energy.gov [DOE]

    DOE alleged in a Notice of Proposed Civil Penalty that American Valve, Inc. failed to certify a variety of showerheads as compliant with the applicable water conservation standards.

  9. Hydraulic engine valve actuation system including independent feedback control

    DOE Patents [OSTI]

    Marriott, Craig D

    2013-06-04T23:59:59.000Z

    A hydraulic valve actuation assembly may include a housing, a piston, a supply control valve, a closing control valve, and an opening control valve. The housing may define a first fluid chamber, a second fluid chamber, and a third fluid chamber. The piston may be axially secured to an engine valve and located within the first, second and third fluid chambers. The supply control valve may control a hydraulic fluid supply to the piston. The closing control valve may be located between the supply control valve and the second fluid chamber and may control fluid flow from the second fluid chamber to the supply control valve. The opening control valve may be located between the supply control valve and the second fluid chamber and may control fluid flow from the supply control valve to the second fluid chamber.

  10. Production-Intent Lost-Motion Variable Valve Actuation Systems...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Production-Intent Lost-Motion Variable Valve Actuation Systems Production-Intent Lost-Motion Variable Valve Actuation Systems Variable valve actuation with onoff IEGR pre-bump is...

  11. Design and Implementation of Silicon Nitride Valves for Heavy...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Implementation of Silicon Nitride Valves for Heavy Duty Diesel Engines Design and Implementation of Silicon Nitride Valves for Heavy Duty Diesel Engines Poster presentation at the...

  12. Requirements for the Valve Train and Technolgies for Enabling...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    for the Valve Train and Technolgies for Enabling HCCI over the Entire Operating Range Requirements for the Valve Train and Technolgies for Enabling HCCI over the Entire Operating...

  13. An evaluation of the effects of valve body erosion on motor-operated valve operability

    SciTech Connect (OSTI)

    Hunt, T.H.; Nitzel, M.E.; Weidenhamer, G.H.

    1995-12-01T23:59:59.000Z

    INEL engineers evaluated effects of erosion-induced valve wall thinning on motor-operated valve operability. The authors reviewed reports that identified the extent and location of erosion damage in nuclear plant valves and chose a globe valve with severe erosion damage to assess the potential for loss of operability. They developed a finite element model of the selected valve and performed structural analyses with valve closing forces, seismic effects, and increased erosion areas to analyze effects of erosion on structural integrity. Results indicate that while some local stresses at the points of maximum erosion exceeded yield, the general stresses were well below yield. Therefore, displacements will be small and bending will not occur. It is concluded that erosion-related wall thinning is not likely to create an operability problem for motor-operated valves.

  14. Cylinder valve packing nut studies

    SciTech Connect (OSTI)

    Blue, S.C. [Martin Marietta Energy Systems, Inc., Paducah, KY (United States)

    1991-12-31T23:59:59.000Z

    The design, manufacture, and use of cylinder valve packing nuts have been studied to improve their resistance to failure from stress corrosion cracking. Stress frozen photoelastic models have been analyzed to measure the stress concentrations at observed points of failure. The load effects induced by assembly torque and thermal expansion of stem packing were observed by strain gaging nuts. The effects of finishing operations and heat treatment were studied by the strain gage hole boring and X-ray methods. Modifications of manufacturing and operation practices are reducing the frequency of stress corrosion failures.

  15. High precision high flow range control valve

    DOE Patents [OSTI]

    McCray, John A. (Idaho Falls, ID)

    1999-01-01T23:59:59.000Z

    A fluid control valve is described having a valve housing having first and second valve housing openings for the ingress and egress of fluid through the control valve. Disposed within a void formed by the control valve is a sleeve having at least one sleeve opening to permit the flow of fluid therethrough. A flow restricter travels within the sleeve to progressively block off the sleeve opening and thereby control flow. A fluid passageway is formed between the first valve housing opening and the outer surface of the sleeve. A second fluid passageway is formed between the inside of the sleeve and the second valve housing opening. Neither fluid passageway contains more than one 90.degree. turn. In the preferred embodiment only one of the two fluid passageways contains a 90.degree. turn. In another embodiment, the control valve housing is bifurcated by a control surface having control surface opening disposed therethrough. A flow restricter is in slidable contact with the control surface to restrict flow of fluid through the control surface openings.

  16. High speed exhaust gas recirculation valve

    DOE Patents [OSTI]

    Fensom, Rod (Peterborough, GB); Kidder, David J. (Peterborough, GB)

    2005-01-18T23:59:59.000Z

    In order to minimize pollutants such as Nox, internal combustion engines typically include an exhaust gas recirculation (EGR) valve that can be used to redirect a portion of exhaust gases to an intake conduit, such as an intake manifold, so that the redirected exhaust gases will be recycled. It is desirable to have an EGR valve with fast-acting capabilities, and it is also desirable to have the EGR valve take up as little space as possible. An exhaust gas recirculation valve is provided that includes an exhaust passage tube, a valve element pivotally mounted within the exhaust passage tube, a linear actuator; and a gear train. The gear train includes a rack gear operatively connected to the linear actuator, and at least one rotatable gear meshing with the rack gear and operatively connected to the valve element to cause rotation of the valve element upon actuation of the linear actuator. The apparatus provides a highly compact package having a high-speed valve actuation capability.

  17. High precision high flow range control valve

    DOE Patents [OSTI]

    McCray, J.A.

    1999-07-13T23:59:59.000Z

    A fluid control valve is described having a valve housing having first and second valve housing openings for the ingress and egress of fluid through the control valve. Disposed within a void formed by the control valve is a sleeve having at least one sleeve opening to permit the flow of fluid therethrough. A flow restricter travels within the sleeve to progressively block off the sleeve opening and thereby control flow. A fluid passageway is formed between the first valve housing opening and the outer surface of the sleeve. A second fluid passageway is formed between the inside of the sleeve and the second valve housing opening. Neither fluid passageway contains more than one 90 [degree] turn. In the preferred embodiment only one of the two fluid passageways contains a 90[degree] turn. In another embodiment, the control valve housing is bifurcated by a control surface having control surface opening disposed therethrough. A flow restricter is in slidable contact with the control surface to restrict flow of fluid through the control surface openings. 12 figs.

  18. Reed valves for internal combustion engines

    SciTech Connect (OSTI)

    Boyesen, E.

    1987-09-29T23:59:59.000Z

    A two-cycle engine is described comprising a cylinder and a piston working in the cylinder. The engine has a compression chamber below the piston and a fuel intake system including a ported valve seat for delivering fuel into the compression chamber. The cylinder has an exhaust port and a transfer passage for delivering compressed fuel from the compression chamber to the space above the piston, and a reed valve overlying the port in the valve seat and adapted to flex away from the ported seat during the upward stroke of the piston. The reed valve is of multiple layer construction with an outlet layer formed of relatively rigid resin material and an inner layer presented inwardly for contact with the valve seat and formed of relatively flexible temperature-resistant synthetic rubber material. The rubber layer is thinner than the resin layer and the resin and rubber layers are adhesively bonded to each other.

  19. Steady-State Flow-Force Compensation in a Hydraulic Spool Valve

    E-Print Network [OSTI]

    Lugowski, Jan

    2013-01-01T23:59:59.000Z

    A high-speed jet flowing inside of a partially-open hydraulic valve is accompanied by a reaction force, also referred to as flow force. The nature of this force has remained a mystery despite an extensive research effort spanning many decades. The momentum theory on the flow force by Lee and Blackburn (1952) explains the origin of the flow force and offers a design solution to shape the valve spool as a turbine bucket. It provides a model to calculate the compensated flow force as well. This paper shows that the model applies to a different flow case due to incorrect assumptions made. A corrected equation is presented based on a detailed analysis of the static-pressure distribution in the valve cavity as well as on a literature review of pressure loss in diffusers and nozzles. The new equation is based on the compensation taking place upstream of the valve orifice, not downstream as assumed by the momentum theory. The new model can be applied to chamfers or notches on the valve spool without the need to machi...

  20. Computational model of aortic valve surgical repair using grafted pericardium

    E-Print Network [OSTI]

    1 Computational model of aortic valve surgical repair using grafted pericardium Peter E. Hammer1, aortic valve repair, membrane, surgical planning, leaflet graft, pericardium ABSTRACT Aortic valve leaflets. Difficulty is largely due to the complex geometry and function of the valve and the lower

  1. Design and sizing of electromagnetic linear actuators for valve applications

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Page 1/9 Design and sizing of electromagnetic linear actuators for valve applications J.C Vannier1. These structures have been studied in order to drive the valves of a car motor. According to general specifications magnet, valves. 1. Introduction, general specifications The valves which can be found in thermal engines

  2. Valve Cap For An Electric Storage Cell

    DOE Patents [OSTI]

    Verhoog, Roelof (Bordeaux, FR); Genton, Alain (Merignac, FR)

    2000-04-18T23:59:59.000Z

    The valve cap for an electric storage cell includes a central annular valve seat (23) and a membrane (5) fixed by its peripheral edge and urged against the seat by a piston (10) bearing thereagainst by means of a spring (12), the rear end of said spring (12) bearing on the endwall (8) of a chamber (20) formed in the cap and containing the piston (10) and the spring. A vent (19) puts the chamber (20) into communication with the atmosphere. A central orifice (26, 28) through the piston (10) and the membrane (5), enables gas from within the cell to escape via the top vent (19) when the valve opens.

  3. Engine Valve Actuation For Combustion Enhancement

    DOE Patents [OSTI]

    Reitz, Rolf Deneys (Madison, WI); Rutland, Christopher J. (Madison, WI); Jhavar, Rahul (Madison, WI)

    2004-05-18T23:59:59.000Z

    A combustion chamber valve, such as an intake valve or an exhaust valve, is briefly opened during the compression and/or power strokes of a 4-stroke combustion cycle in an internal combustion engine (in particular, a diesel or CI engine). The brief opening may (1) enhance mixing withing the combustion chamber, allowing more complete oxidation of particulates to decrease engine emissions; and/or may (2) delay ignition until a more desirable time, potentially allowing a means of timing ignition in otherwise difficult-to-control conditions, e.g., in HCCI (Homogeneous Charge Compression Ignition) conditions.

  4. Engine valve actuation for combustion enhancement

    DOE Patents [OSTI]

    Reitz, Rolf Deneys (Madison, WI); Rutland, Christopher J. (Madison, WI); Jhavar, Rahul (Madison, WI)

    2008-03-04T23:59:59.000Z

    A combustion chamber valve, such as an intake valve or an exhaust valve, is briefly opened during the compression and/or power strokes of a 4-strokes combustion cycle in an internal combustion engine (in particular, a diesel or CI engine). The brief opening may (1) enhance mixing withing the combustion chamber, allowing more complete oxidation of particulates to decrease engine emissions; and/or may (2) delay ignition until a more desirable time, potentially allowing a means of timing ignition in otherwise difficult-to-control conditions, e.g., in HCCI (Homogeneous Charge Compression Ignition) conditions.

  5. Method and apparatus for monitoring motor operated valve motor output torque and power at valve seating

    DOE Patents [OSTI]

    Casada, Donald A. (Oak Ridge, TN)

    1996-01-01T23:59:59.000Z

    A method and apparatus are provided for monitoring a motor operated valve during the brief period when the valve seats and the torque switch trips to deenergize the valve motor. The method uses voltage measurements on the load side of a deenergizing switch that opens to deenergize the motor to determine, among other things, final motor rotational speed and the decelerating torque at motor deenergization.

  6. Flow-Force Compensation in a Hydraulic Valve

    E-Print Network [OSTI]

    Lugowski, Jan

    2015-01-01T23:59:59.000Z

    Flow-reaction forces acting in hydraulic valves have been studied for many decades. Despite this, they are difficult to account for due to the complexities of the jet flow. This paper focuses only on the reduction, also referred to as compensation, of the flow force as applied to a valve spool featuring a profile of a turbine bucket. Fluid power textbooks explain the compensation taking place on such a profile by applying Newton laws of motion to the profile and deliver an equation for the magnitude and the direction of the flow force. This paper shows that both the magnitude and the direction of the compensating flow force are incorrect if calculated from the textbook equation. A corrected analysis of the dynamic forces is presented that are in agreement with earlier experiments by this author. It follows that the compensating flow force should be calculated from the static-pressure imbalance on the spool profile. That is, not Newton but Pascal law should be applied to calculate the compensating flow force.

  7. Valve studies: Hydrogen fluoride monitoring of UF{sub 6} cylinder valves

    SciTech Connect (OSTI)

    Leedy, R.R.; Ellis, A.R.; Hoffmann, D.P.; Marsh, G.C. [and others

    1996-08-01T23:59:59.000Z

    Uranium hexafluoride (UF{sub 6}) cylinder valves have, like the cylinders, been in use and/or storage for periods ranging from 15 to 44 years. Visual inspection of the cylinders has shown that the extent of corrosion and the overall cylinder condition varies widely throughout the storage yards. One area of concern is the integrity of the cylinder valves. Visual inspection has found deposits which have been identified as radioactive material on or near the valves. These deposits suggest leakage of UF{sub 6} and may indicate valve degradation; however, these deposits may simply be residual material from cylinder filling operations.

  8. Emerging Trends in Heart Valve Engineering: Part III. Novel Technologies for Mitral Valve Repair and Replacement.

    E-Print Network [OSTI]

    2015-01-01T23:59:59.000Z

    of different mechanical prostheses suitable for replacementmechanical cardiac valve prosthesis. Ann. Thorac. Surg. 75:and clinical impact of prosthesis–patient mismatch in the

  9. Method for valve seating control for an electro-hydraulic engine valve

    DOE Patents [OSTI]

    Sun, Zongxuan (Plymouth, MN)

    2011-01-11T23:59:59.000Z

    Valve lift in an internal combustion engine is controlled by an electro-hydraulic actuation mechanism including a selectively actuable hydraulic feedback circuit.

  10. Relation of aortic valve calcium to chronic kidney disease (from the Chronic Renal Insufficiency Cohort Study)

    E-Print Network [OSTI]

    2015-01-01T23:59:59.000Z

    with calcific aortic valve disease. Cardiovascular HealthA, et al. Cardiac valve calcification in haemodialysisCurtis JR. Aortic and mitral valve calcification in patients

  11. Analysis of FRUITFULL promoter motifs and their influence on valve expression during fruit development

    E-Print Network [OSTI]

    Woods, Jennifer Carol

    2010-01-01T23:59:59.000Z

    motifs and their influence on valve expression during fruitappear WT-like with only valve expression remaining (Fig.motifs and their influence on valve expression during fruit

  12. Effect of the Mitral Valve's Anterior Leaflet on Axisymmetry of Transmitral Vortex Ring.

    E-Print Network [OSTI]

    Falahatpisheh, A; Pahlevan, NM; Kheradvar, A

    2015-01-01T23:59:59.000Z

    and B. S. Rana. Anatomy of the mitral valve: understandingthe mitral valve complex in mitral regurgitation. Eur. J.and H. -H. Sievers. Heart valve macro- and microstructure.

  13. On the multiscale modeling of heart valve biomechanics in health and disease

    E-Print Network [OSTI]

    Weinberg, Eli J.; Shahmirzadi, Danial; Mofrad, Mohammad Reza

    2010-01-01T23:59:59.000Z

    mofrad@berkeley.edu healthy heart valve is described atan organ, each of the heart valves consists of a number ofpulmonary, and tricuspid valves each normally have three ?

  14. Proof of concept of FOLDAVALVE, a novel 14 Fr totally repositionable and retrievable transcatheter aortic valve.

    E-Print Network [OSTI]

    Kheradvar, A; Groves, EM; Tseng, E

    2015-01-01T23:59:59.000Z

    for transcatheter aortic valve therapy. Prog Cardiovasc Dis.Transcatheter aortic-valve implantation for aortic stenosisgators. Transcatheter aortic-valve replacement with a self-

  15. Relation of Aortic Valve Calcium to Chronic Kidney Disease (from the Chronic Renal Insufficiency Cohort Study)

    E-Print Network [OSTI]

    2015-01-01T23:59:59.000Z

    with calcific aortic valve disease. Cardiovascular HealthA, et al. Cardiac valve calcification in haemodialysisCurtis JR. Aortic and mitral valve calcification in patients

  16. Emergent Presentation of Decompensated Mitral Valve Prolapse and Atrial Septal Defect

    E-Print Network [OSTI]

    Kang, Jessie; Das, Bijon

    2015-01-01T23:59:59.000Z

    E, Gring CN, Griffin BP. Mitral valve prolapse. Lancet. 2.NM. Myxomatous mitral valve disease bench to bedside: LDL-geometry and degree of mitral valve prolapse. Circulation.

  17. A congestion mechanism for uphill expressways, Part I: the shoulder lane "release valve"

    E-Print Network [OSTI]

    Patire, Anthony D.; Cassidy, Michael J.

    2010-01-01T23:59:59.000Z

    shoulder lane “release valve” Anthony D. Patire and Michaelshoulder lane “release valve” Anthony D. Patire and Michaelacting as a “ re- lease valve” for the excess accumulation

  18. Percutaneous aortic valve replacement in a re-animated postmortem heart

    E-Print Network [OSTI]

    White, Jennifer; Sun, Amy; Killien, Lauren; Evangelista, Dennis

    2006-01-01T23:59:59.000Z

    implantation of heart valve prosthesis for the treatment ofF. Percutaneous aortic valve replacement: an experimentalA stentless trileaflet valve from a sheet of decellularized

  19. Install Removable Insulation on Valves and Fittings

    SciTech Connect (OSTI)

    Not Available

    2006-01-01T23:59:59.000Z

    This revised ITP tip sheet on installing removable insulation on valves and fittings provides how-to advice for improving the system using low-cost, proven practices and technologies.

  20. Frostless heat pump having thermal expansion valves

    DOE Patents [OSTI]

    Chen, Fang C. (Knoxville, TN); Mei, Viung C. (Oak Ridge, TN)

    2002-10-22T23:59:59.000Z

    A heat pump system having an operable relationship for transferring heat between an exterior atmosphere and an interior atmosphere via a fluid refrigerant and further having a compressor, an interior heat exchanger, an exterior heat exchanger, a heat pump reversing valve, an accumulator, a thermal expansion valve having a remote sensing bulb disposed in heat transferable contact with the refrigerant piping section between said accumulator and said reversing valve, an outdoor temperature sensor, and a first means for heating said remote sensing bulb in response to said outdoor temperature sensor thereby opening said thermal expansion valve to raise suction pressure in order to mitigate defrosting of said exterior heat exchanger wherein said heat pump continues to operate in a heating mode.

  1. The safety valve and climate policy

    E-Print Network [OSTI]

    Jacoby, Henry D.; Ellerman, A. Denny.

    In discussions of a cap-and-trade system for implementation of Kyoto Protocol-type quantity targets, a "safety valve" was proposed where, by government sales of emissions permits at a fixed price, the marginal cost of the ...

  2. Split Venturi, Axially-Rotated Valve

    DOE Patents [OSTI]

    Walrath, David E. (Laramie, WY); Lindberg, William R. (Laramie, WY); Burgess, Robert K. (Sheridan, WY)

    2000-08-29T23:59:59.000Z

    The present invention provides an axially-rotated valve which permits increased flow rates and lower pressure drop (characterized by a lower loss coefficient) by using an axial eccentric split venturi with two portions where at least one portion is rotatable with respect to the other portion. The axially-rotated valve typically may be designed to avoid flow separation and/or cavitation at full flow under a variety of conditions. Similarly, the valve is designed, in some embodiments, to produce streamlined flow within the valve. A typical cross section of the eccentric split venturi may be non-axisymmetric such as a semicircular cross section which may assist in both throttling capabilities and in maximum flow capacity using the design of the present invention. Such a design can include applications for freeze resistant axially-rotated valves and may be fully-opened and fully-closed in one-half of a complete rotation. An internal wide radius elbow typically connected to a rotatable portion of the eccentric venturi may assist in directing flow with lower friction losses. A valve actuator may actuate in an axial manner yet be uniquely located outside of the axial flow path to further reduce friction losses. A seal may be used between the two portions that may include a peripheral and diametrical seal in the same plane.

  3. Flow Split Venturi, Axially-Rotated Valve

    DOE Patents [OSTI]

    Walrath, David E. (Laramie, WY); Lindberg, William R. (Laramie, WY); Burgess, Robert K. (Sheridan, WY); LaBelle, James (Murrieta, CA)

    2000-02-22T23:59:59.000Z

    The present invention provides an axially-rotated valve which permits increased flow rates and lower pressure drop (characterized by a lower loss coefficient) by using an axial eccentric split venturi with two portions where at least one portion is rotatable with respect to the other portion. The axially-rotated valve typically may be designed to avoid flow separation and/or cavitation at full flow under a variety of conditions. Similarly, the valve is designed, in some embodiments, to produce streamlined flow within the valve. An axially aligned outlet may also increase the flow efficiency. A typical cross section of the eccentric split venturi may be non-axisymmetric such as a semicircular cross section which may assist in both throttling capabilities and in maximum flow capacity using the design of the present invention. Such a design can include applications for freeze resistant axially-rotated valves and may be fully-opened and fully-closed in one-half of a complete rotation. An internal wide radius elbow typically connected to a rotatable portion of the eccentric venturi may assist in directing flow with lower friction losses. A valve actuator may actuate in an axial manner yet be uniquely located outside of the axial flow path to further reduce friction losses. A seal may be used between the two portions that may include a peripheral and diametrical seal in the same plane. A seal separator may increase the useful life of the seal between the fixed and rotatable portions.

  4. Well injection valve with retractable choke

    SciTech Connect (OSTI)

    Pringle, R.E.

    1986-07-22T23:59:59.000Z

    An injection valve is described for use in a well conduit consisting of: a housing having a bore, a valve closure member in the bore moving between open and closed positions, a flow tube telescopically movable in the housing for controlling the movement of the valve closure member, means for biasing the flow tube in a direction for allowing the valve closure member to move to the closed position, an expandable and contractible fluid restriction connected to the flow tube and extending into the bore for moving the flow tube to the open position in response to injection fluid, but allowing the passage of well tools through the valve, the restriction contractible in response to fluid flow, the restriction includes, segments movable into and out of the bore, and biasing means yieldably urging the segments into the bore, a no-go shoulder on the flow tube, and releasable lockout means between the flow tube and the housing for locking the flow tube and valve in the open position.

  5. Apparatus and method for non-invasive diagnosis and control of motor operated valve condition

    DOE Patents [OSTI]

    Lyon, Richard H. (Belmont, MA); Chai, Jangbom (Seoul, KR); Lang, Jeffrey H. (Sudbury, MA); Hagman, Wayne H. (Belmont, MA); Umans, Stephen D. (Belmont, MA); Saarela, Olli J. (Helsinki, FI)

    1997-01-01T23:59:59.000Z

    An apparatus compares the torque from an MOV motor with the valve displacement, and from the comparison assesses MOV operating condition. A transducer measures the vibration of the housing of an MOV. The vibrations are due to the motions of the rotating elements within the housing, which motions are directly related to the motion of the valve relative to its seat. Signal processing apparatus analyzes the vibrations to recover the rotations of the rotating elements and thus the motion of the valve plug. Lost motion can also be determined (if a lost motion connection exists) by demodulating the vibration signal and thus taking into account also the lost motion. Simultaneously, the forces applied to the valve are estimated by estimating the torque between the stator and the rotor of the motor. Such torque can be estimated from measuring the input current and voltage alone, using a forgetting factor and a correction for the forgetting factor. A signature derived from relating the torque to the valve position can be used to assess the condition of the MOV, by comparing the signature to signatures for MOVs of known conditions. The vibration analysis components generate signals that relate to the position of elements in the operator. Similarly, the torque estimator estimates the torque output by any type of electric motor, whether or not part of an MOV analysis unit.

  6. Apparatus and method for non-invasive diagnosis and control of motor operated valve condition

    DOE Patents [OSTI]

    Lyon, R.H.; Chai, J.; Lang, J.H.; Hagman, W.H.; Umans, S.D.; Saarela, O.J.

    1997-01-14T23:59:59.000Z

    An apparatus compares the torque from an MOV motor with the valve displacement, and from the comparison assesses MOV operating condition. A transducer measures the vibration of the housing of an MOV. The vibrations are due to the motions of the rotating elements within the housing, which motions are directly related to the motion of the valve relative to its seat. Signal processing apparatus analyzes the vibrations to recover the rotations of the rotating elements and thus the motion of the valve plug. Lost motion can also be determined (if a lost motion connection exists) by demodulating the vibration signal and thus taking into account also the lost motion. Simultaneously, the forces applied to the valve are estimated by estimating the torque between the stator and the rotor of the motor. Such torque can be estimated from measuring the input current and voltage alone, using a forgetting factor and a correction for the forgetting factor. A signature derived from relating the torque to the valve position can be used to assess the condition of the MOV, by comparing the signature to signatures for MOVs of known conditions. The vibration analysis components generate signals that relate to the position of elements in the operator. Similarly, the torque estimator estimates the torque output by any type of electric motor, whether or not part of an MOV analysis unit. 28 figs.

  7. Simulant Development for Hanford Tank Farms Double Valve Isolation (DVI) Valves Testing

    SciTech Connect (OSTI)

    Wells, Beric E.

    2012-12-21T23:59:59.000Z

    Leakage testing of a representative sample of the safety-significant isolation valves for Double Valve Isolation (DVI) in an environment that simulates the abrasive characteristics of the Hanford Tank Farms Waste Transfer System during waste feed delivery to the Waste Treatment and Immobilization Plant (WTP) is to be conducted. The testing will consist of periodic leak performed on the DVI valves after prescribed numbers of valve cycles (open and close) in a simulated environment representative of the abrasive properties of the waste and the Waste Transfer System. The valve operations include exposure to cycling conditions that include gravity drain and flush operation following slurry transfer. The simulant test will establish the performance characteristics and verify compliance with the Documented Safety Analysis. Proper simulant development is essential to ensure that the critical process streams characteristics are represented, National Research Council report “Advice on the Department of Energy's Cleanup Technology Roadmap: Gaps and Bridges”

  8. Emerging Trends in Heart Valve Engineering: Part I. Solutions for Future

    E-Print Network [OSTI]

    2015-01-01T23:59:59.000Z

    role in calci?c aortic valve disease. Cardiovasc. Pathol.heart valves. J. Heart Valve Dis. 10:105–110, 2001.B. , and K. E. Yutzey. Heart valve structure and function in

  9. Mechanisms of bioprosthetic heart valve failure: Fatigue causes collagen denaturation and glycosaminoglycan loss

    E-Print Network [OSTI]

    Zand, Robert

    Mechanisms of bioprosthetic heart valve failure: Fatigue causes collagen denaturation heart valve (BPHV) degeneration, characterized by extracellular matrix deterioration, remod- eling) with glutaraldehyde fixed porcine aortic valve bioprostheses, that the mechanical function of cardiac valve cusps

  10. Study of collagen structure in canine myxomatous mitral valve disease 

    E-Print Network [OSTI]

    Hadian, Mojtaba

    2009-01-01T23:59:59.000Z

    Myxomatous mitral valve disease (MMVD) is the single most common acquired cardiac disease of dogs, and is a disease of significant veterinary importance. It also bears close similarities to mitral valve prolapse in humans ...

  11. Novel design of a rotary valve using axiomatic design

    E-Print Network [OSTI]

    Peliks, Robert Bilgor

    2005-01-01T23:59:59.000Z

    Rotary valves have existed for millennia; and while they have developed tremendously since the first Roman valves, many of the same problems have persisted. The basic problems are caused by the coupling of functional ...

  12. Design and Experimental Implementation of an Electromagnetic Engine Valve Drive

    E-Print Network [OSTI]

    Parlikar, T.A.

    In conventional internal combustion engines, engine valve displacements are fixed relative to crankshaft position. If these valves were actuated as a variable function of crankshaft angle, significant improvements in fuel ...

  13. Design of a Thermally-Actuated Gas Lift Safety Valve

    E-Print Network [OSTI]

    Gilbertson, Eric W.

    Gas-lifted oil wells are susceptible to failure through malfunction of gas lift valve assemblies (GLV). One failure mode occurs when the GLV check valve fails and product passes into the well annulus, potentially reaching ...

  14. Exhaust gas bypass valve control for thermoelectric generator

    DOE Patents [OSTI]

    Reynolds, Michael G; Yang, Jihui; Meisner, Greogry P.; Stabler, Francis R.; De Bock, Hendrik Pieter (Peter) Jacobus; Anderson, Todd Alan

    2012-09-04T23:59:59.000Z

    A method of controlling engine exhaust flow through at least one of an exhaust bypass and a thermoelectric device via a bypass valve is provided. The method includes: determining a mass flow of exhaust exiting an engine; determining a desired exhaust pressure based on the mass flow of exhaust; comparing the desired exhaust pressure to a determined exhaust pressure; and determining a bypass valve control value based on the comparing, wherein the bypass valve control value is used to control the bypass valve.

  15. Department of Industrial Engineering Spring 2011 Machining Valve Seats

    E-Print Network [OSTI]

    Demirel, Melik C.

    PENNSTATE Department of Industrial Engineering Spring 2011 Machining Valve Seats Overview: The team worked with Quaker Chemical Corporation to machine valve seats using three different lubricants provided-degree chamfer on the valve seats are very specialized and expensive. For this project, the cutting tool

  16. Collagen Bundle Orientation Explains Aortic Valve Leaflet Coaptation

    E-Print Network [OSTI]

    Collagen Bundle Orientation Explains Aortic Valve Leaflet Coaptation Peter E. Hammer1 , Christina A. The aortic valve owes its strength and durability to a network of collagen fibers within the leaflets. However, the pattern of these fibers and their role in valve function is not well understood. We imaged

  17. Noise Reduction of a Turbofan Bleed Valve Vincent Phong1

    E-Print Network [OSTI]

    Papamoschou, Dimitri

    Noise Reduction of a Turbofan Bleed Valve Vincent Phong1 , Shervin Taghavi Nezhad2 , Feng Liu3 and computational research effort investigated the noise sources of a pneumatic bleed valve used in turbofan engines, rapid-prototyped valve designs which enabled the exploration of a large parameter space. Microphone

  18. LIQUID MIXING STUDIES WITH AN INTEGRATED MIXER/VALVE

    E-Print Network [OSTI]

    Voldman, Joel

    181 LIQUID MIXING STUDIES WITH AN INTEGRATED MIXER/VALVE Joel Voldman* , Martha L. Gray, and testing of an integrated mixer/valve and a method for determining its mixing performance. The method of their mixing performance - the mixing time. We have designed and fabricated a microfabricated liquid mixer/valve

  19. VOICE SYNTHESIS USING THE GENERALIZED PRESSURE-CONTROLLED VALVE

    E-Print Network [OSTI]

    Smyth, Tamara

    VOICE SYNTHESIS USING THE GENERALIZED PRESSURE-CONTROLLED VALVE Tamara Smyth and Alireza Fathi, and the vibration of vo- cal folds in the larynx, which function as a pressure-controlled valve regulating airflow into the the vocal tract. This re- search explores the application of the generalized dynamic pressure-control valve

  20. Avalanche spin-valve transistor K. J. Russell,a)

    E-Print Network [OSTI]

    Russell, Kasey

    Avalanche spin-valve transistor K. J. Russell,a) Ian Appelbaum,b) Wei Yi, D. J. Monsma, F. Capasso, California 93106 (Received 11 June 2004; accepted 10 September 2004) A spin-valve transistor with a Ga allow fabrication of spin-valve transistors with high gain in a variety of materials. © 2004 American

  1. Mechanobiology of the Aortic Heart Valve Jonathan T. Butcher1

    E-Print Network [OSTI]

    Simmons, Craig A.

    Review: Mechanobiology of the Aortic Heart Valve Jonathan T. Butcher1 , Craig A. Simmons2 , James N valve, positioned between the left ventri- cle and aortic root, prevents retrograde flow of blood into the ventricle during diastole. Opening and closing of the valve occurs passively in response to inertial forces

  2. Spin-valve photodiode Ian Appelbaum,a)

    E-Print Network [OSTI]

    Russell, Kasey

    Spin-valve photodiode Ian Appelbaum,a) D. J. Monsma, K. J. Russell, V. Narayanamurti, and C. M; accepted 28 August 2003 An optical spin-valve effect is observed using sub-bandgap internal photoemission the ``spin-valve'' effect SVE , because the relative magnetizations of these layers, and thus the flow

  3. Modelisation mathematique realiste de la valve mitrale Sabine Paeme

    E-Print Network [OSTI]

    Wolper, Pierre

    Mod´elisation math´ematique r´ealiste de la valve mitrale Sabine Paeme Mai 2009 #12;Table des mati . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.2 Les valves cardiaques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.2.2 Anatomie de la valve mitrale . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.3 Physiologie

  4. Nonlinear Control for Magnetic Levitation of Automotive Engine Valves

    E-Print Network [OSTI]

    Grizzle, Jessy W.

    1 Nonlinear Control for Magnetic Levitation of Automotive Engine Valves Katherine Peterson, Member for and implemented on an electromagnetic valve actuator for use in automotive engines, the control methodology, it is experimentally eval- uated on an electromagnetic valve actuator designed for use in the actuation of automotive

  5. Fluid-driven reciprocating apparatus and valving for controlling same

    DOE Patents [OSTI]

    Whitehead, John C. (Davis, CA); Toews, Hans G. (East Aurora, NY)

    1993-01-01T23:59:59.000Z

    A control valve assembly for alternately actuating a pair of fluid-driven free-piston devices by using fluid pressure communication therebetween. Each control valve is switched by a pressure signal depending on the state of its counterpart's piston. The communication logic is arranged to provide overlap of the forward strokes of the pistons, so that at least one of the pair will always be pressurized. Thus, uninterrupted pumping of liquid is made possible from a pair of free-piston pumps. In addition, the speed and frequency of piston stroking is entirely dependent on the mechanical power load applied. In the case of a pair of pumps, this enables liquid delivery at a substantially constant pressure over the full range of flow rates, from zero to maximum flow. One embodiment of the invention utilized two pairs of fluid-driven free-piston devices whereby a bipropellant liquid propulsion system may be operated, so as to provide continuous flow of both fuel and oxidizer liquids when used in rocket applications, for example.

  6. NONLINEAR MAGNETIC LEVITATION OF AUTOMOTIVE ENGINE VALVES

    E-Print Network [OSTI]

    Stefanopoulou, Anna

    NONLINEAR MAGNETIC LEVITATION OF AUTOMOTIVE ENGINE VALVES K. Peterson, J.W. Grizzle, and A.G. Stefanopoulou £ ½ £ University of Michigan, Ann Arbor Abstract: Position regulation of a magnetic levitation the region of attraction. The effects of magnetic saturation are included in the model, and accounted

  7. Rotary sequencing valve with flexible port plate

    DOE Patents [OSTI]

    Wagner, Glenn Paul

    2005-05-10T23:59:59.000Z

    Rotary sequencing valve comprising a rotor having a rotor face rotatable about an axis perpendicular to the rotor face, wherein the rotor face has a plurality of openings, one or more of which are disposed at a selected radial distance from the axis, and wherein the rotor includes at least one passage connecting at least one pair of the plurality of openings. The valve includes a flexible port plate having a first side and a second side, wherein the first side faces the rotor and engages the rotor such that the flexible port plate can be rotated coaxially by the rotor and can move axially with respect to the rotor, wherein the flexible port plate has a plurality of ports between the first and second sides, which ports are aligned with the openings in the rotor face. The valve also includes a stator having a stator face disposed coaxially with the rotor and the flexible port plate, wherein the second side of the flexible port plate is in sealable, slidable rotary contact with the stator face, wherein the stator face has a plurality of openings, some of which are disposed at the selected radial distance from the axis, and wherein the plurality of openings extend as passages through the stator. The valve may be used in pressure or temperature swing adsorption systems.

  8. Dynamic Testing of Check Valves William Rahmeyer

    E-Print Network [OSTI]

    Rahmeyer, William J.

    the web site http://www.engineering.usu.edu/Departments/cee/Faculty/rahm/check.html INTRODUCTION The twoDynamic Testing of Check Valves William Rahmeyer Professor of Civil and Environmental Engineering rahmeyer@fs.uwrl.usu.edu http://www.engineering.usu.edu/Departments/cee/Faculty/rahm/check.html #12

  9. Elec 331 -Blood Pressure Heart Valves

    E-Print Network [OSTI]

    Pulfrey, David L.

    Elec 331 - Blood Pressure 1 Heart Valves · Atrio-Ventricular (AV) ­ Bicuspid / Mitral (left - Blood Pressure 2 Phases of the Heart · Systole (Max BP) ­ Ventricle contracted ­ Aorta inflated 331 - Blood Pressure 3 Korotkov Phases / Sounds S D P P Nothing Sharp Swish Faint Nothing 0 1 2-3 4 5

  10. Microfluidic Cell Electroporation Using a Mechanical Valve

    E-Print Network [OSTI]

    Lu, Chang

    Microfluidic Cell Electroporation Using a Mechanical Valve Jun Wang, M. Jane Stine, and Chang Lu Center, and Bindley Bioscience Center, Purdue University, West Lafayette, Indiana 47907 A microfluidic of integrating electroporation as a unit operation in large- scale microfluidic systems with the increasing

  11. Disc valve for sampling erosive process streams

    DOE Patents [OSTI]

    Mrochek, J.E.; Dinsmore, S.R.; Chandler, E.W.

    1984-08-16T23:59:59.000Z

    This is a patent for a disc-type, four-port sampling valve for service with erosive high temperature process streams. Inserts and liners of ..cap alpha..-silicon carbide respectively, in the faceplates and in the sampling cavities, limit erosion while providing lubricity for a smooth and precise operation. 1 fig.

  12. Statistical Performance Evaluation Of Soft Seat Pressure Relief Valves

    SciTech Connect (OSTI)

    Harris, Stephen P.; Gross, Robert E.

    2013-03-26T23:59:59.000Z

    Risk-based inspection methods enable estimation of the probability of failure on demand for spring-operated pressure relief valves at the United States Department of Energy's Savannah River Site in Aiken, South Carolina. This paper presents a statistical performance evaluation of soft seat spring operated pressure relief valves. These pressure relief valves are typically smaller and of lower cost than hard seat (metal to metal) pressure relief valves and can provide substantial cost savings in fluid service applications (air, gas, liquid, and steam) providing that probability of failure on demand (the probability that the pressure relief valve fails to perform its intended safety function during a potentially dangerous over pressurization) is at least as good as that for hard seat valves. The research in this paper shows that the proportion of soft seat spring operated pressure relief valves failing is the same or less than that of hard seat valves, and that for failed valves, soft seat valves typically have failure ratios of proof test pressure to set pressure less than that of hard seat valves.

  13. Mixed mode fuel injector with individually moveable needle valve members

    DOE Patents [OSTI]

    Stewart, Chris; Chockley, Scott A.; Ibrahim, Daniel R.; Lawrence, Keith; Tomaseki, Jay; Azam, Junru H.; Tian, Steven Ye; Shafer, Scott F.

    2004-08-03T23:59:59.000Z

    A fuel injector includes a homogenous charge nozzle outlet set and a conventional nozzle outlet set controlled respectively, by first and second needle valve members. One of the needle valve members moves to an open position while the other needle valve member remains stationary for a homogeneous charge injection event. The former needle valve member stays stationary while the other needle valve member moves to an open position for a conventional injection event. One of the needle valve members is at least partially positioned in the other needle valve member. Thus, the injector can perform homogeneous charge injection events, conventional injection events, or even a mixed mode having both types of injection events in a single engine cycle.

  14. Hydraulically actuated gas exchange valve assembly and engine using same

    DOE Patents [OSTI]

    Carroll, Thomas S. (Peoria, IL); Taylor, Gregory O. (Hinsdale, IL)

    2002-09-03T23:59:59.000Z

    An engine comprises a housing that defines a hollow piston cavity that is separated from a gas passage by a valve seat. The housing further defines a biasing hydraulic cavity and a control hydraulic cavity. A gas valve member is also included in the engine and is movable relative to the valve seat between an open position at which the hollow piston cavity is open to the gas passage and a closed position in which the hollow piston cavity is blocked from the gas passage. The gas valve member includes a ring mounted on a valve piece and a retainer positioned between the ring and the valve piece. A closing hydraulic surface is included on the gas valve member and is exposed to liquid pressure in the biasing hydraulic cavity.

  15. Hydrodynamic injection with pneumatic valving for microchip electrophoresis with total analyte utilization

    SciTech Connect (OSTI)

    Sun, Xuefei; Kelly, Ryan T.; Danielson, William F.; Agrawal, Nitin; Tang, Keqi; Smith, Richard D.

    2011-04-26T23:59:59.000Z

    A novel hydrodynamic injector that is directly controlled by a pneumatic valve has been developed for reproducible microchip capillary electrophoresis (CE) separations. The poly(dimethylsiloxane) (PDMS) devices used for evaluation comprise a separation channel, a side channel for sample introduction, and a pneumatic valve aligned at the intersection of the channels. A low pressure (? 3 psi) applied to the sample reservoir is sufficient to drive sample into the separation channel. The rapidly actuated pneumatic valve enables injection of discrete sample plugs as small as ~100 pL for CE separation. The injection volume can be easily controlled by adjusting the intersection geometry, the solution back pressure and the valve actuation time. Sample injection could be reliably operated at different frequencies (< 0.1 Hz to >2 Hz) with good reproducibility (peak height relative standard deviation ? 3.6%) and no sampling biases associated with the conventional electrokinetic injections. The separation channel was dynamically coated with a cationic polymer, and FITC-labeled amino acids were employed to evaluate the CE separation. Highly efficient (? 7.0 × 103 theoretical plates for the ~2.4 cm long channel) and reproducible CE separations were obtained. The demonstrated method has numerous advantages compared with the conventional techniques, including repeatable and unbiased injections, no sample waste, high duty cycle, controllable injected sample volume, and fewer electrodes with no need for voltage switching. The prospects of implementing this injection method for coupling multidimensional separations, for multiplexing CE separations and for sample-limited bioanalyses are discussed.

  16. Electromagnetic valve for controlling the flow of molten, magnetic material

    DOE Patents [OSTI]

    Richter, T.

    1998-06-16T23:59:59.000Z

    An electromagnetic valve for controlling the flow of molten, magnetic material is provided, which comprises an induction coil for generating a magnetic field in response to an applied alternating electrical current, a housing, and a refractory composite nozzle. The nozzle is comprised of an inner sleeve composed of an erosion resistant refractory material (e.g., a zirconia ceramic) through which molten, magnetic metal flows, a refractory outer shell, and an intermediate compressible refractory material, e.g., unset, high alumina, thermosetting mortar. The compressible refractory material is sandwiched between the inner sleeve and outer shell, and absorbs differential expansion stresses that develop within the nozzle due to extreme thermal gradients. The sandwiched layer of compressible refractory material prevents destructive cracks from developing in the refractory outer shell. 5 figs.

  17. Technical evaluation: 300 Area steam line valve accident

    SciTech Connect (OSTI)

    Not Available

    1993-08-01T23:59:59.000Z

    On June 7, 1993, a journeyman power operator (JPO) was severely burned and later died as a result of the failure of a 6-in. valve that occurred when he attempted to open main steam supply (MSS) valve MSS-25 in the U-3 valve pit. The pit is located northwest of Building 331 in the 300 Area of the Hanford Site. Figure 1-1 shows a layout of the 300 Area steam piping system including the U-3 steam valve pit. Figure 1-2 shows a cutaway view of the approximately 10- by 13- by 16-ft-high valve pit with its various steam valves and connecting piping. Valve MSS-25, an 8-in. valve, is located at the bottom of the pit. The failed 6-in. valve was located at the top of the pit where it branched from the upper portion of the 8-in. line at the 8- by 8- by 6-in. tee and was then ``blanked off`` with a blind flange. The purpose of this technical evaluation was to determine the cause of the accident that led to the failure of the 6-in. valve. The probable cause for the 6-in. valve failure was determined by visual, nondestructive, and destructive examination of the failed valve and by metallurgical analysis of the fractured region of the valve. The cause of the accident was ultimately identified by correlating the observed failure mode to the most probable physical phenomenon. Thermal-hydraulic analyses, component stress analyses, and tests were performed to verify that the probable physical phenomenon could be reasonably expected to produce the failure in the valve that was observed.

  18. Method and system for measuring gate valve clearances and seating force

    DOE Patents [OSTI]

    Casada, Donald A. (Knoxville, TN); Haynes, Howard D. (Knoxville, TN); Moyers, John C. (Oak Ridge, TN); Stewart, Brian K. (Burns, TN)

    1996-01-01T23:59:59.000Z

    Valve clearances and seating force, as well as other valve operational parameters, are determined by measuring valve stem rotation during opening and closing operations of a translatable gate valve. The magnitude of the stem rotation, and the relative difference between the stem rotation on opening and closing provides valuable data on the valve internals in a non-intrusive manner.

  19. Cardiac Valve Annulus Manual Segmentation Using Computer Assisted Visual Feedback in Three-Dimensional Image Data

    E-Print Network [OSTI]

    Oxford, University of

    Cardiac Valve Annulus Manual Segmentation Using Computer Assisted Visual Feedback in Three is an important tool for the study of valve anatomy and physiology, for the four main valves of the heart (mitral rat hearts, on all four valves. I. INTRODUCTION There are four main cardiac valves in the heart, two

  20. Developing a Training Tool for Intraoperative Mitral Valve Analysis Neil A. Tenenholtz, Robert D. Howe

    E-Print Network [OSTI]

    Developing a Training Tool for Intraoperative Mitral Valve Analysis Neil A. Tenenholtz, Robert D@seas.harvard.edu INTRODUCTION The mitral valve is one of the four valves of the human heart. Serving as a passive check valve, a healthy mitral valve permits the flow of oxygenated blood from the left atrium to the left ventricle while

  1. Automated Modelling of Cartridge Valve Flow Mapping Song Liu and Bin Yao

    E-Print Network [OSTI]

    Yao, Bin

    Automated Modelling of Cartridge Valve Flow Mapping Song Liu and Bin Yao Abstract-- Proportional poppet-type cartridge valves are the key elements of the energy saving programmable valves, which have significantly saving energy usage. Unlike costly conventional four-way valves, the cartridge valve has simple

  2. Method and system for measuring gate valve clearances and seating force

    DOE Patents [OSTI]

    Casada, D.A.; Haynes, H.D.; Moyers, J.C.; Stewart, B.K.

    1996-01-30T23:59:59.000Z

    Valve clearances and seating force, as well as other valve operational parameters, are determined by measuring valve stem rotation during opening and closing operations of a translatable gate valve. The magnitude of the stem rotation, and the relative difference between the stem rotation on opening and closing provides valuable data on the valve internals in a non-intrusive manner. 8 figs.

  3. Are subsurface safety valves needed in deepwater?

    SciTech Connect (OSTI)

    Verret, A.; Hey, C.

    1995-11-01T23:59:59.000Z

    The object of this study was to evaluate SCSSV reliability and identify a preferred configuration for subsea completions in deepwater. A system design consisting of subsea, conventional, dual-bore tree, cluster wells was selected for evaluation. The study examined inherent risks associated with six tubing retrievable SCSSV configurations. Risks were evaluated for personnel and environmental safety, and operational and financial impact of: No SCSSV; Single SCSSV; Dual operating system single SCSSV; Tandem hot/hot (both valves active) SCSSVs without lockout features; Tandem hot/hot SCSSVs with lockout features; Tandem hot/cold (one valve active, the other dormant in open position) SCSSVs with lockout features. A ``fault tree`` identifying events that could lead to deleterious incidents was used to evaluate risks. Costs and consequences associated with potential events were determined using existing industry data, and resulting calculated risks were evaluated. Recommendations were developed and compared to current regulations, and potential regulatory conflicts were identified.

  4. Curved butterfly bileaflet prosthetic cardiac valve

    DOE Patents [OSTI]

    McQueen, David M. (185 Hillside Ave., Chatham, NJ 07928); Peskin, Charles S. (186 Harrard Dr., Hartsdale, NY 10530)

    1991-06-25T23:59:59.000Z

    An annular valve body having a central passageway for the flow of blood therethrough with two curved leaflets each of which is pivotally supported on an accentric positioned axis in the central passageway for moving between a closed position and an open position. The leaflets are curved in a plane normal to the eccentric axis and positioned with the convex side of the leaflets facing each other when the leaflets are in the open position. Various parameters such as the curvature of the leaflets, the location of the eccentric axis, and the maximum opening angle of the leaflets are optimized according to the following performance criteria: maximize the minimum peak velocity through the valve, maximize the net stroke volume, and minimize the mean forward pressure difference, thereby reducing thrombosis and improving the hemodynamic performance.

  5. Water cooling of HVDC thyristor valves

    SciTech Connect (OSTI)

    Lips, H.P. (Siemens AG, Erlangen (Germany))

    1994-10-01T23:59:59.000Z

    It is generally accepted that water is a very effective medium to remove heat losses from any type of equipment. When used for HVDC thyristor valves, the fundamentals of electrolyte conduction and water chemistry need to be considered in the design of the cooling circuit. The characteristics of the materials used, in conjunction with high voltage stresses and circuit configuration, play an important role to assure longevity and corrosion-free performance.

  6. Swing Check Valve Design Criteria and CFD Validation

    SciTech Connect (OSTI)

    Dallstream, Brian E.; Fricke, Brian A.; Becker, Bryan R. [University of Missouri-Kansas City (United States)

    2006-07-01T23:59:59.000Z

    This paper provides information on swing check valve selection criteria suitable for nuclear power plant applications. In this project, four swing check valves were analyzed to demonstrate the implementation and application of this information. In this example, swing check valves were selected according to 'ASME Boiler and Pressure Vessel Code, Section III' and 'ASME B16.34, Valves Flanged, Threaded, and Welding End'. This paper also discusses the utilization of Computational Fluid Dynamics Software (CFD) as a means to analyze valve design. The use of CFD is a relatively new approach for validation of valve design that is becoming invaluable due to the high cost of physical bench testing. The Instrument Society of America (ISA) Analysis Division and the American Society of Mechanical Engineers (ASME) Computational Fluid Dynamics Technical Committee have taken a proactive approach in setting standards and practices for the use of CFD in design and validation. (authors)

  7. Mechanisms of Oxidation-Enhanced Wear in Diesel Exhaust Valves...

    Broader source: Energy.gov (indexed) [DOE]

    Diesel Exhaust Valves (Friction and Wear Reduction) Peter J. Blau, Principal Investigator Materials Science and Technology Division Oak Ridge National Laboratory May 21, 2009...

  8. automatic discharge valves: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    systems shows that the total number of control valves and their widespread distribution in the tunnel (and therefore the length of the access routes) will all be...

  9. ahmed valve device: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    increased control in the device. Some existing micro-pumps and valves utilized in microfluidics involve electrical, pneumatic, and thermal actuation. However, electrical...

  10. Apparatus for adjustably controlling valve movement and fuel injection

    SciTech Connect (OSTI)

    Miller, C.R.; Shyu, T.P.; Weber, J.R.

    1993-08-24T23:59:59.000Z

    Apparatus is described for adjustably controlling valve movement and fuel injection of an engine having at least one fuel injection system, one exhaust valve system, one intake valve system, a microprocessor controller for receiving input signals and delivering engine controlling electrical signals, and a liquid pressure system, comprising: a single piezoelectric motor connectable to the microprocessor controller and the liquid pressure system and being adapted to receive engine controlling electrical signals from the microprocessor and controllably delivering pressurized liquid signals to the liquid pressure system in response to the received signal; and a spool valve having a single spool, the valve having a plurality of inlets and outlets and being connectable to the liquid pressure system for receiving pressurized liquid signals therefrom and controllably moving the single spool of the spool valve and delivering valve and injection controlling signals to the valve systems and injector system and controlling both valve movement and fuel injection responsive to engine controlling electrical signals received by the piezoelectric motor.

  11. air operated valve: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    constant speed pump and differential producing, modulating control valve, with a variable speed drive is presented. This case study... Holzenthal, L. Jr. 58 Influence of Air...

  12. aortic valve replacement: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    with a constant speed pump and differential producing, modulating control valve, with a variable speed drive is presented. This case study... Holzenthal, L. Jr. First Page...

  13. Subsurface safety valve with lock-open system

    SciTech Connect (OSTI)

    Dickson, R.L.; Smith, R.R.

    1986-11-25T23:59:59.000Z

    A well safety valve is described comprising: a housing having a bore therethrough; a valve mounted in the housing to open and close to control the flow through the bore; an operator tube in the housing for opening the valve; means in the housing for moving the operator tube in a first direction to open and hold the valve open; means in the housing for moving the operator tube in a second direction to permit the valve to close; a temporary lockout sleeve in the housing in tandem with the operator tube for temporarily holding the valve open. The operator tube and the lockout sleeve are in end-to-end contact when the lockout sleeve is inoperative and the operator tube is holding the valve open, when the operator tube and the lockout sleeve are moving simultaneously in the housing between operating positions, and when the operator tube is inoperative and the lockout sleeve is holding the valve open; and the operator tube and the lockout sleeve each having means for coupling the operator tube and the lockout sleeve with a lockout tool for moving the operator tube and the lockout sleeve simultaneously when the lockout sleeve is moved from the inoperative to an operative position holding the valve open.

  14. Dual mode fuel injector with one piece needle valve member

    DOE Patents [OSTI]

    Lawrence, Keith E. (Peoria, IL); Hinrichsen, Michael H. (Goodfield, IL); Buckman, Colby (Bellville, MI)

    2005-01-18T23:59:59.000Z

    A fuel injector includes a homogenous charge nozzle outlet set and a conventional nozzle outlet set controlled respectively by inner and outer needle value members. The homogenous charged nozzle outlet set is defined by an outer needle value member that is moveably positioned in an injector body, which defines the conventional nozzle outlet set. The inner needle valve member is positioned in the outer needle valve member. The outer needle valve member is a piece component that includes at least one external guide surface, an external value surface and an internal valve seat.

  15. Compact, electro-hydraulic, variable valve actuation system providing...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Compact, electro-hydraulic, variable valve actuation system providing variable lift, timing and duration to enable high efficiency engine combustion control Compact,...

  16. aortic valve sclerosis: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 319 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  17. asymptomatic aortic valve: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 220 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  18. aortic valve prosthesis: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 245 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  19. aortic valve disease: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    on the strength and anisotropic properties of the valve Stavroulakis, Georgios E. 48 Pulse Wave Imaging Of Abdominal Aortic Aneurysms Comparison Between Control And Angiotensin...

  20. aortic valve thickening: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 290 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  1. aortic valve leaflet: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 245 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  2. aortic stenotic valves: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 208 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  3. aortic valve tissue: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 222 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  4. aortic valve mesenchymal: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 286 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  5. aortic valve leaflets: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 245 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  6. aortic valve substitution: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 304 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  7. aortic valve stenotic: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 208 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  8. aortic heart valve: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 297 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  9. aortic valve endocarditis: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 210 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  10. aortic valve implantation: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 280 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  11. aortic valve prostheses: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 225 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  12. aortic valve stenosis: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 233 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  13. aortic valve calcification: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 255 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  14. aortic valve morphology: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 244 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  15. aortic valve: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 207 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  16. aortic valve bioprosthesis: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 210 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  17. aortic valve insufficiency: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 232 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  18. aortic valve area: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 211 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  19. aortic valve calcium: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    diastolic diameter. The PDC Papaharilaou, Yannis 323 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  20. actuated ball valve: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    for energy conservation by utilizing self contained temperature actuated valves. As steam costs soar it becomes more and more important to conserve feed stock dollars as well...

  1. Simulation of a novel electromechanical engine valve drive to quantify performance gains in fuel consumption

    E-Print Network [OSTI]

    Miller, Justin (Justin Lee)

    2011-01-01T23:59:59.000Z

    This thesis describes the modeling and simulation of a novel electromechanical valve drive known as the MIT EMV. This valve drive allows an engine to achieve variable valve timing which has been shown to produce improvements ...

  2. A MEMS Thin Film AlN Supercritical Carbon Dioxide Valve

    E-Print Network [OSTI]

    Chen, Ya-Mei

    2011-01-01T23:59:59.000Z

    and T. K. Tang, “MEMS micro-valve for space applications”,of the fabricated thermal MEMS valve by Kim et al. [An electrostatically actuated gas valve with an s-shape film

  3. Hemodynamic Environments from Opposing Sides of Human Aortic Valve Leaflets Evoke Distinct Endothelial Phenotypes In Vitro

    E-Print Network [OSTI]

    Weinberg, Eli J.; Mack, Peter J.; Schoen, Frederick J.; García-Cardeña, Guillermo; Kaazempur Mofrad, Mohammad R.

    2010-01-01T23:59:59.000Z

    the most frequent heart valve disease in developed countriesand glutaraldehyde treated aortic valve cusp-part II: aof a tri-lea?et prosthetic valve. J Biomed Eng. 1989;12:13–

  4. Design of a gas force simulator for the MIT Electromechanical Valve Drive project

    E-Print Network [OSTI]

    Otten, James S. (James Stewart)

    2006-01-01T23:59:59.000Z

    The MIT electromechanical Valve Drive (EMVD) is a continuously variable valve actuation device for an automotive internal combustion engine. Current experimentation of the EMVD has been limited to intake valve events. When ...

  5. Numerical Investigation of the Performance of Three Hinge Designs of Bileaflet Mechanical Heart Valves

    E-Print Network [OSTI]

    Simon, Hélène A.; Ge, Liang; Sotiropoulos, Fotis; Yoganathan, Ajit P.

    2010-01-01T23:59:59.000Z

    parameters on bilea?et mechanical heart valve ?ow dynamics.J. Heart Valve Dis. 18:535–545, 2009. Gross, J. M. , M. C.two bilea?et mechanical heart valves under aortic and mitral

  6. Vacuum/Compression Valving (VCV) Using Parrafin-Wax on a Centrifugal Microfluidic CD Platform

    E-Print Network [OSTI]

    2013-01-01T23:59:59.000Z

    Volume 8 | Issue 3 | e58523 Vacuum/Compression Valving (VCV)Vacuum/Compression Valving (VCV) Using Parrafin-Wax on aThis paper introduces novel vacuum/compression valves (VCVs)

  7. System and method for controlling engine knock using electro-hydraulic valve actuation

    DOE Patents [OSTI]

    Brennan, Daniel G

    2013-12-10T23:59:59.000Z

    A control system for an engine includes a knock control module and a valve control module. The knock control module adjusts a period that one or more of an intake valve and an exhaust valve of a cylinder are open based on engine knock corresponding to the cylinder. The valve control module, based on the adjusted period, controls the one or more of the intake valve and the exhaust valve using one or more hydraulic actuators.

  8. Nuclear-radiation-actuated valve. [Patent application; for increasing coolant flow to blanket

    DOE Patents [OSTI]

    Christiansen, D.W.; Schively, D.P.

    1982-01-19T23:59:59.000Z

    The present invention relates to a breeder reactor blanket fuel assembly coolant system valve which increases coolant flow to the blanket fuel assembly to minimize long-term temperature increases caused by fission of fissile fuel created from fertile fuel through operation of the breeder reactor. The valve has a valve first part (such as a valve rod with piston) and a valve second part (such as a valve tube surrounding the valve rod, with the valve tube having side slots surrounding the piston). Both valve parts have known nuclear radiation swelling characteristics. The valve's first part is positioned to receive nuclear radiation from the nuclear reactor's fuel region. The valve's second part is positioned so that its nuclear radiation induced swelling is different from that of the valve's first part. The valve's second part also is positioned so that the valve's first and second parts create a valve orifice which changes in size due to the different nuclear radiation caused swelling of the valve's first part compared to the valve's second part. The valve may be used in a nuclear reactor's core coolant system.

  9. Disc valve for sampling erosive process streams

    DOE Patents [OSTI]

    Mrochek, J.E.; Dinsmore, S.R.; Chandler, E.W.

    1986-01-07T23:59:59.000Z

    A four-port disc valve is described for sampling erosive, high temperature process streams. A rotatable disc defining opposed first and second sampling cavities rotates between fired faceplates defining flow passageways positioned to be alternatively in axial alignment with the first and second cavities. Silicon carbide inserts and liners composed of [alpha] silicon carbide are provided in the faceplates and in the sampling cavities to limit erosion while providing lubricity for a smooth and precise operation when used under harsh process conditions. 1 fig.

  10. Corrosion in HVDC valve cooling systems

    SciTech Connect (OSTI)

    Jackson, P.O.; Abrahamsson, B.; Gustavsson, D.; Igetoft, L.

    1997-04-01T23:59:59.000Z

    Stainless steel couplings in the main cooling water pipes of HVDC thyristor valves have been in use since 1983, with an overall satisfactory behavior. However, some water leakage due to corrosion below the sealing O-rings of the couplings was observed during 1992. An extensive investigation and follow-up worldwide showed a direct correlation between water quality and the corrosion rate of the stainless steel couplings. Recommendations are given about actions to be taken in order to maintain a long lifetime for the fine water systems.

  11. Sliding pressure control valve for pneumatic hammer drill

    DOE Patents [OSTI]

    Polsky, Yarom (Albuquerque, NM)

    2011-08-30T23:59:59.000Z

    A pneumatic device control apparatus and method comprising a ported valve slidably fitted over a feed tube of the pneumatic device, and using a compliant biasing device to constrain motion of the valve to provide asymmetric timing for extended pressurization of a power chamber and reduced pressurization of a return chamber of the pneumatic device. The pneumatic device can be a pneumatic hammer drill.

  12. ON CONDITION MONITORING OF EXHAUST VALVES IN MARINE DIESEL ENGINES

    E-Print Network [OSTI]

    Mosegaard, Klaus

    ON CONDITION MONITORING OF EXHAUST VALVES IN MARINE DIESEL ENGINES T. L. Fog x L. K. Hansen z , J : Research & Development, MAN B&W Diesel A/S Teglholmsgade 41, DK­2450, Copenhagen SV, Denmark. E­mail: tof­invasive characterisation of ex­ haust valve conditions in large marine diesel engines, were exper­ imentally investigated

  13. Design, maintenance extend FGD system slurry valve life

    SciTech Connect (OSTI)

    LeMay, B. [St. John`s River Power Park, Jacksonville, FL (United States); Willyard, B. [Grand River Dam Authority, Chouteau, OK (United States); Polasek, S. [Lower Colorado River Authority, Austin, TX (United States); Clarkson, C.W. [Clarkson Co., Sparks, NV (United States)

    1995-08-01T23:59:59.000Z

    This article describes how power plants in Florida, Oklahoma and Texas adopted improved maintenance techniques and sought better design criteria to gain greater slurry valve reliability. Slurry valves, a vital part of a flue gas desulfurization (FGD) system, are critical to a power plant`s ability to meet or exceed acid rain emission requirements. The performance and reliability of these valves can significantly affect unit operation and load capacity. For example, slurry valves installed on the suction and discharge ends of scrubber tower pumps are a main point of isolation. When these valves malfunction, the scrubber tower must be shut down. Problems with valves that control the feed system and reaction tank alter slurry pH and density, and also affect unit load. In addition, a single valve that serves dual-pumping systems from the slurry storage tank to the reaction tank can cause a system outage. Because of their key role in system operation, specific maintenance approaches were developed at several power plants to improve slurry valve reliability and run times.

  14. Isolation valve selections play important role in pipelining

    SciTech Connect (OSTI)

    Hingoraney, R.; Goto, D.N. [Saudi Aramco, Dhahran (Saudi Arabia)

    1995-08-01T23:59:59.000Z

    Isolation valves are an integral part of every pipeline and play an important role in safe and proper operation. For almost every project, pipeline designers wrestle with choosing between the through-conduit gate valves and ball valves and their associated actuating mechanisms. Complicating this selection process are variables such as individual preferences and the lack of broad-based operating experience. As expected, there is no single valve and actuator combination that is correct for every pipeline or every application. Variables which must be considered and specifically evaluated for each valve installation include: operating characteristics, function, location, process fluid, materials options, space availability, maintenance, repair capability, delivery schedule, and costs. This paper reviews these issues.

  15. Massive Gas Injection Experiments at JET – Performance and Characterisation of the Disruption Mitigation Valve

    E-Print Network [OSTI]

    Massive Gas Injection Experiments at JET – Performance and Characterisation of the Disruption Mitigation Valve

  16. Spin-dependent boundary resistance in the lateral spin-valve structure T. Kimura,a)

    E-Print Network [OSTI]

    Otani, Yoshichika

    Spin-dependent boundary resistance in the lateral spin-valve structure T. Kimura,a) J. Hamrle spin-valve signal without any spurious magnetoresistive signal in a lateral spin-valve structure consisting of Cu/Ni-Fe ohmic junction using local current injection. The obtained spin-valve signal is much

  17. Phase diagram of magnetic domain walls in spin valve nano-stripes N. Rougemaille,1

    E-Print Network [OSTI]

    Boyer, Edmond

    Phase diagram of magnetic domain walls in spin valve nano-stripes N. Rougemaille,1 V. Uhlí,2, 1 O walls in Co/Cu/Py spin valve nano-stripes (Py: Permalloy), in which the Co layer is mostly single domain Magneto- Resistance. These stacking are called spin valve for a metal spacer layer, and pseudo spin valve

  18. Review Article The aortic valve microenvironment and its role in calcific aortic

    E-Print Network [OSTI]

    Simmons, Craig A.

    Review Article The aortic valve microenvironment and its role in calcific aortic valve disease 21 November 2010; accepted 1 December 2010 Abstract In calcific aortic valve disease, fibrotic and calcific lesions form focally in the fibrosa layer of the valve leaflets. Layer

  19. IN-PLANE BANDPASS REGULATION CHECK VALVE IN HEAT-SHRINK PACKAGING FOR DRUG DELIVERY

    E-Print Network [OSTI]

    Meng, Ellis

    IN-PLANE BANDPASS REGULATION CHECK VALVE IN HEAT-SHRINK PACKAGING FOR DRUG DELIVERY R. Lo and E. Meng University of Southern California, Los Angeles, California, USA ABSTRACT The first check valve valve design and these results were confirmed experimentally. The valve regulates flow between 150

  20. Analysis of a Third-Generation Princeton Tri-leaflet Mechanical Heart Valve

    E-Print Network [OSTI]

    Petta, Jason

    Analysis of a Third-Generation Princeton Tri-leaflet Mechanical Heart Valve Michael Hsu Advisor heart valve · Static analysis of leaflet under uniform pressure of 10 MPa Summer Objectives · Find Heart valve disease · Over 5 million affected · Over 225,000 valve- replacement surgeries performed

  1. Internal combustion engine with rotary valve assembly having variable intake valve timing

    DOE Patents [OSTI]

    Hansen, Craig N. (Eden Prairie, MN); Cross, Paul C. (Shorewood, MN)

    1995-01-01T23:59:59.000Z

    An internal combustion engine has rotary valves associated with movable shutters operable to vary the closing of intake air/fuel port sections to obtain peak volumetric efficiency over the entire range of speed of the engine. The shutters are moved automatically by a control mechanism that is responsive to the RPM of the engine. A foot-operated lever associated with the control mechanism is also used to move the shutters between their open and closed positions.

  2. Noninvasive valve monitor using constant magnetic and/or DC electromagnetic field

    DOE Patents [OSTI]

    Casada, Donald A. (Knoxville, TN); Haynes, Howard D. (Knoxville, TN)

    1993-01-01T23:59:59.000Z

    One or more sources of steady magnetic field are carefully located on the outside of a valve body. The constant magnetic field is transmitted into the valve body and valve internals. A magnetic field detector carefully located on the outside of the valve body detects the intensity of the magnetic field at its location. As the position of a valve internal part is changed, there is an alteration in the magnetic field in the valve, and a consequent change in the detected magnetic field. Changes in the detected signal provide an indication of the position and motion of the valve internals.

  3. CX-007508: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Record of Categorical Exclusion for Rework Bryan Mound Seaway Dock Terminal Bypass Valve MOV-C308 CX(s) Applied: B1.3 Date: 11/16/2011 Location(s): Texas Offices(s): Strategic Petroleum Reserve Field Office

  4. Turbo-generator control with variable valve actuation

    DOE Patents [OSTI]

    Vuk, Carl T. (Denver, IA)

    2011-02-22T23:59:59.000Z

    An internal combustion engine incorporating a turbo-generator and one or more variably activated exhaust valves. The exhaust valves are adapted to variably release exhaust gases from a combustion cylinder during a combustion cycle to an exhaust system. The turbo-generator is adapted to receive exhaust gases from the exhaust system and rotationally harness energy therefrom to produce electrical power. A controller is adapted to command the exhaust valve to variably open in response to a desired output for the turbo-generator.

  5. Electric actuation of a surface controlled subsea safety valve

    E-Print Network [OSTI]

    Bartlett, Timothy Joseph

    2013-02-22T23:59:59.000Z

    to the conversion of many components from hydraulic operation to electric. Therefore, it is the purpose of this report to detail and propose an engineering solution to the electrical conversion of a surface controlled subsea safety valve (SCSSV). Preliminary...

  6. Design of an electronically-actuated gas lift safety valve

    E-Print Network [OSTI]

    Yu, Changkuan, S.M. Massachusetts Institute of Technology

    2013-01-01T23:59:59.000Z

    Gas lift valves are widely used in oil production fields to pump recycled gas and nitrogen into the production tubing, to sustain production by aerating the oil and lifting it to the ground or sea surface. Today's industry ...

  7. Automated auscultation : using acoustic features to diagnose mitral valve prolapse

    E-Print Network [OSTI]

    Jung, Marcia Yeojin, 1982-

    2004-01-01T23:59:59.000Z

    During annual physical examinations, a primary-care physician listens to the heart using a stethoscope to assess the condition of the heart muscle and valves. This process, termed cardiac auscultation, is the primary means ...

  8. Hemodynamic Changes following Aortic Valve Bypass: A Mathematical Approach

    E-Print Network [OSTI]

    Benevento, Emilia

    Aortic valve bypass (AVB) has been shown to be a viable solution for patients with severe aortic stenosis (AS). Under this circumstance, the left ventricle (LV) has a double outlet. The objective was to develop a mathematical ...

  9. Energy Savings Potential of Process Control Valve Replacement

    E-Print Network [OSTI]

    Holzenthal, L. Jr.

    A review of current design methods for industrial process control systems that utilize modulated control valves as their final element is presented. The infornUltion that is available is then used to find the theoretic potential for energy savings...

  10. Energy Savings Potential of Process Control Valve Replacement 

    E-Print Network [OSTI]

    Holzenthal, L. Jr.

    1994-01-01T23:59:59.000Z

    candidates for savings. A feasibility study of retrofitting a pipeline flow control system, currently operating with a constant speed pump and differential producing, modulating control valve, with a variable speed drive is presented. This case study...

  11. Failure Mode and Sensitivity Analysis of Gas Lift Valves

    E-Print Network [OSTI]

    Gilbertson, Eric W.

    Gas-lifted oil wells are susceptible to failure through malfunction of gas lift valves. This is a growing concern as offshore wells are drilled thousands of meters below the ocean floor in extreme temperature and pressure ...

  12. ahmed glaucoma valve: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    mechanisms may be Seonkwan Kim; Youngho Kim 311 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  13. aortic valve positive: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    a combination... Meyer, Clark A. 2010-07-14 56 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  14. aortic valve surgery: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    cobordant to over... Baldwin, John A 2012-01-01 303 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  15. aortic valve thickness: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    20 21 22 23 24 25 Next Page Last Page Topic Index 261 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  16. active infective valve: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Union (ERC Paris-Sud XI, Universit de 188 IMECE2007-42559 HIGH SPEED ROTARY PULSE WIDTH MODULATED ONOFF VALVE ? CiteSeer Summary: A key enabling technology to...

  17. Replace Pressure-Reducing Valves with Backpressure Turbogenerators

    SciTech Connect (OSTI)

    Not Available

    2006-01-01T23:59:59.000Z

    This revised ITP steam tip sheet on replacing pressure-reducing valves provides how-to advice for improving industrial steam systems using low-cost, proven practices and technologies.

  18. Nonlinear springs with applications to flow regulation valves and mechanisms

    E-Print Network [OSTI]

    Freeman, David Calvin

    2008-01-01T23:59:59.000Z

    This thesis focuses on the application of nonlinear springs for fluid flow control valves where geometric constraints, or fabrication technologies, limit the use of available solutions. Types of existing nonlinear springs ...

  19. Tissue-engineered canine mitral valve constructs as In vitro research models for myxomatous mitral valve disease 

    E-Print Network [OSTI]

    Liu, Mengmeng

    2014-11-28T23:59:59.000Z

    Myxomatous mitral valve disease (MMVD) is one of the most common degenerative cardiac diseases affecting humans and dogs; however, its pathogenesis is not completely understood. This study focussed on developing ...

  20. Gas lift valve failure mode analysis and the design of a thermally-actuated positive-locking safety valve

    E-Print Network [OSTI]

    Gilbertson, Eric (Eric W.)

    2010-01-01T23:59:59.000Z

    Gas-lifted oil wells are susceptible to failure through malfunction of gas lift valves. This is a growing concern as offshore wells are drilled thousands of meters below the ocean floor in extreme temperature and pressure ...

  1. High pressure capillary micro-fluidic valve device and a method of fabricating same

    DOE Patents [OSTI]

    Crocker, Robert W. (Fremont, CA); Caton, Pamela F. (Berkely, CA); Gerhardt, Geoff C. (Milbury, MA)

    2007-04-17T23:59:59.000Z

    A freeze-thaw valve and a method of micro-machining the freeze-thaw valve is provided and includes a valve housing, wherein the valve housing defines a housing cavity and includes a housing inlet, a housing vent, a capillary tubing inlet and a capillary tubing outlet. A valve body is provided, at least a portion of which is lithographically constructed, wherein the valve body includes a refrigerant inlet, a refrigerant outlet and an expansion chamber. The expansion chamber is disposed to communicate the refrigerant inlet with the refrigerant outlet and includes a restriction region having a flow restriction. Additionally, the valve body is disposed within the housing cavity to form an insulating channel between the valve housing and the valve body.

  2. Engine including hydraulically actuated valvetrain and method of valve overlap control

    DOE Patents [OSTI]

    Cowgill, Joel (White Lake, MI)

    2012-05-08T23:59:59.000Z

    An exhaust valve control method may include displacing an exhaust valve in communication with the combustion chamber of an engine to an open position using a hydraulic exhaust valve actuation system and returning the exhaust valve to a closed position using the hydraulic exhaust valve actuation assembly. During closing, the exhaust valve may be displaced for a first duration from the open position to an intermediate closing position at a first velocity by operating the hydraulic exhaust valve actuation assembly in a first mode. The exhaust valve may be displaced for a second duration greater than the first duration from the intermediate closing position to a fully closed position at a second velocity at least eighty percent less than the first velocity by operating the hydraulic exhaust valve actuation assembly in a second mode.

  3. Monovalve with integrated fuel injector and port control valve, and engine using same

    DOE Patents [OSTI]

    Milam, David M. (Metamora, IL)

    2001-11-06T23:59:59.000Z

    An engine includes an engine casing that defines a hollow piston cavity separated from an exhaust passage and an intake passage by a valve seat. A gas exchange valve member is positioned adjacent the valve seat and is moveable between an open position and a closed position. The gas exchange valve member also defines an opening that opens into the hollow piston cavity. A needle valve member is positioned in the gas exchange valve member adjacent a nozzle outlet and is moveable between an inject position and a blocked position. A port control valve member, which has a hydraulic surface, is mounted around the gas exchange valve member and moveable between an intake position and an exhaust position. A pilot valve is moveable between a first position at which the port control hydraulic surface is exposed to a source of high pressure fluid, and a second position at which the port control hydraulic surface is exposed to a source of low pressure fluid.

  4. System and method for controlling hydraulic pressure in electro-hydraulic valve actuation systems

    DOE Patents [OSTI]

    Brennan, Daniel G; Marriott, Craig D; Cowgill, Joel; Wiles, Matthew A; Patton, Kenneth James

    2014-09-23T23:59:59.000Z

    A control system for an engine includes a first lift control module and a second lift control module. The first lift control module increases lift of M valves of the engine to a predetermined valve lift during a period before disabling or re-enabling N valves of the engine. The second lift control module decreases the lift of the M valves to a desired valve lift during a period after enabling or re-enabling the N valves of the engine, wherein N and M are integers greater than or equal to one.

  5. Reduced-impact sliding pressure control valve for pneumatic hammer drill

    DOE Patents [OSTI]

    Polsky, Yarom (Oak Ridge, TN); Grubelich, Mark C. (Albuquerque, NM); Vaughn, Mark R. (Albuquerque, NM)

    2012-05-15T23:59:59.000Z

    A method and means of minimizing the effect of elastic valve recoil in impact applications, such as percussive drilling, where sliding spool valves used inside the percussive device are subject to poor positioning control due to elastic recoil effects experienced when the valve impacts a stroke limiting surface. The improved valve design reduces the reflected velocity of the valve by using either an energy damping material, or a valve assembly with internal damping built-in, to dissipate the compression stress wave produced during impact.

  6. Simulation of the Three-Dimensional Hinge Flow Fields of a Bileaflet Mechanical Heart Valve Under Aortic Conditions

    E-Print Network [OSTI]

    Simon, Hélène A.; Ge, Liang; Sotiropoulos, Fotis; Yoganathan, Ajit P.

    2010-01-01T23:59:59.000Z

    a bilea?et mechanical heart valve in an axisymmetric aorta.parallel bilea?et mechanical heart valve with clear housing.J. Heart Valve Dis. 5:591–599, 1996. Ellis, J. T. , T. M.

  7. Percutaneous Mitral Valve Dilatation: Single Balloon versus Double Balloon - A Finite Element Study

    SciTech Connect (OSTI)

    Schievano, Silvia; Kunzelman, Karyn; Nicosia, Mark; Cochran, R. P.; Einstein, Daniel R.; Khambadkone, Sachin; Bonheoffer, Philipp

    2009-01-01T23:59:59.000Z

    Background: Percutaneous mitral valve (MV) dilatation is performed with either a single balloon (SB) or double balloon (DB) technique. The aim of this study was to compare the two balloon system results using the finite element (FE) method. Methods and Results: An established FE model of the MV was modified by fusing the MV leaflet edges at commissure level to simulate a stenotic valve (orifice area=180mm2). A FE model of a 30mm SB (low-pressure, elastomeric balloon) and an 18mm DB system (high-pressure, non-elastic balloon) was created. Both SB and DB simulations resulted in splitting of the commissures and subsequent stenosis dilatation (final MV area=610mm2 and 560mm2 respectively). Stresses induced by the two balloon systems varied across the valve. At the end of inflation, SB showed higher stresses in the central part of the leaflets and at the commissures compared to DB simulation, which demonstrated a more uniform stress distribution. The higher stresses in the SB analysis were due to the mismatch of the round balloon shape with the oval mitral orifice. The commissural split was not easily accomplished with the SB due to its high compliance. The high pressure applied to the DB guaranteed the commissural split even when high forces were required to break the commissure welds. Conclusions: The FE model demonstrated that MV dilatation can be accomplished by both SB and DB techniques. However, the DB method resulted in higher probability of splitting of the fused commissures and less damage caused to the MV leaflets by overstretching.

  8. Multiscale simulations of the aortic heart valve : applications in disease and surgery

    E-Print Network [OSTI]

    Weinberg, Eli, 1979-

    2008-01-01T23:59:59.000Z

    This thesis presents mathematical models describing the mechanical behavior of the human aortic heart valve over a range of length and time scales. In the human heart, the valves perform the vital function of controlling ...

  9. Rendering the Electromechanical Valve Actuator Globally Asymptotically Stable Katherine S. Peterson*

    E-Print Network [OSTI]

    Stefanopoulou, Anna

    Rendering the Electromechanical Valve Actuator Globally Asymptotically Stable Katherine S. Peterson to render the electromechanical valve actuator (EVA) globally asymptotically stable (GAS). Elec model. Here, we demonstrate and prove that our controller renders the system GAS without any assumption

  10. Design and fabrication of microfluidic valves using poly(N-isopropylacrylamide)

    E-Print Network [OSTI]

    Reticker-Flynn, Nathan Edward

    2008-01-01T23:59:59.000Z

    A compact printable microfluidic valve composed of poly(N-isopropylacrylamide) has been designed, fabricated, and tested. The design of the valve consists of filling microwells with poly(NIPAAm) and bonding PDMS channels ...

  11. Nonlinear System Modeling, Optimal Cam Design, and Advanced System Control for an Electromechanical Engine Valve Drive

    E-Print Network [OSTI]

    Qiu, Yihui

    A cam-based shear force-actuated electromechanical valve drive system offering variable valve timing in internal combustion engines was previously proposed and demonstrated. To transform this concept into a competitive ...

  12. Morphological, cellular and proteomic features of canine myxomatous mitral valve disease 

    E-Print Network [OSTI]

    Han, Richard I-Ming

    2009-01-01T23:59:59.000Z

    Myxomatous mitral valve degeneration (MMVD) is the single most common cardiac disease of the dog, and is analogous to Mitral Valve Prolapse in humans. Very little is known about the aetiopathogenesis of this disease or ...

  13. Simultaneous Detection and Registration for Ileo-Cecal Valve Detection in 3D CT Colonography

    E-Print Network [OSTI]

    Barbu, Adrian

    Simultaneous Detection and Registration for Ileo-Cecal Valve Detection in 3D CT Colonography Le Lu1-Cecal Valve (ICV) detection in both clean and tagged 3D CT colonography scans. Our final ICV detection system

  14. Vacuum/Compression Valving (VCV) Using Parrafin-Wax on a Centrifugal Microfluidic CD Platform

    E-Print Network [OSTI]

    2013-01-01T23:59:59.000Z

    implementing two valves using a single VCV wax plug. This isvalves such that melted wax from a normally-closed valve (releases it when the wax is melted) is later transferred to

  15. Department of Mechanical and Nuclear Engineering Spring 2012 Electro-Mechanically Actuated Trip and Throttle Valve

    E-Print Network [OSTI]

    Demirel, Melik C.

    a special type of fail-safe valve for steam turbines. This valve closes rapidly to stop steam flow into a turbine, during emergency situations, to prevent injury and damage to the turbine. Some steam turbine

  16. Drive piston assembly for a valve actuator assembly

    DOE Patents [OSTI]

    Sun, Zongxuan (Troy, MI)

    2010-02-23T23:59:59.000Z

    A drive piston assembly is provided that is operable to selectively open a poppet valve. The drive piston assembly includes a cartridge defining a generally stepped bore. A drive piston is movable within the generally stepped bore and a boost sleeve is coaxially disposed with respect to the drive piston. A main fluid chamber is at least partially defined by the generally stepped bore, drive piston, and boost sleeve. First and second feedback chambers are at least partially defined by the drive piston and each are disposed at opposite ends of the drive piston. At least one of the drive piston and the boost sleeve is sufficiently configured to move within the generally stepped bore in response to fluid pressure within the main fluid chamber to selectively open the poppet valve. A valve actuator assembly and engine are also provided incorporating the disclosed drive piston assembly.

  17. Low power integrated pumping and valving arrays for microfluidic systems

    DOE Patents [OSTI]

    Krulevitch, Peter A. (Pleasanton, CA); Benett, William J. (Livermore, CA); Rose, Klint A. (Livermore, CA); Hamilton, Julie (Tracy, CA); Maghribi, Mariam (Davis, CA)

    2006-04-11T23:59:59.000Z

    Low power integrated pumping and valving arrays which provide a revolutionary approach for performing pumping and valving approach for performing pumping and valving operations in microfabricated fluidic systems for applications such as medical diagnostic microchips. Traditional methods rely on external, large pressure sources that defeat the advantages of miniaturization. Previously demonstrated microfabrication devices are power and voltage intensive, only function at sufficient pressure to be broadly applicable. This approach integrates a lower power, high-pressure source with a polymer, ceramic, or metal plug enclosed within a microchannel, analogous to a microsyringe. When the pressure source is activated, the polymer plug slides within the microchannel, pumping the fluid on the opposite side of the plug without allowing fluid to leak around the plug. The plugs also can serve as microvalves.

  18. ISOLOK VALVE ACCEPTANCE TESTING FOR DWPF SME SAMPLING PROCESS

    SciTech Connect (OSTI)

    Edwards, T.; Hera, K.; Coleman, C.; Jones, M.; Wiedenman, B.

    2011-12-05T23:59:59.000Z

    Evaluation of the Defense Waste Processing Facility (DWPF) Chemical Process Cell (CPC) cycle time identified several opportunities to improve the CPC processing time. Of the opportunities, a focus area related to optimizing the equipment and efficiency of the sample turnaround time for DWPF Analytical Laboratory was identified. The Mechanical Systems & Custom Equipment Development (MS&CED) Section of the Savannah River National Laboratory (SRNL) evaluated the possibility of using an Isolok{reg_sign} sampling valve as an alternative to the Hydragard{reg_sign} valve for taking process samples. Previous viability testing was conducted with favorable results using the Isolok sampler and reported in SRNL-STI-2010-00749 (1). This task has the potential to improve operability, reduce maintenance time and decrease CPC cycle time. This report summarizes the results from acceptance testing which was requested in Task Technical Request (TTR) HLW-DWPF-TTR-2010-0036 (2) and which was conducted as outlined in Task Technical and Quality Assurance Plan (TTQAP) SRNL-RP-2011-00145 (3). The Isolok to be tested is the same model which was tested, qualified, and installed in the Sludge Receipt Adjustment Tank (SRAT) sample system. RW-0333P QA requirements apply to this task. This task was to qualify the Isolok sampler for use in the DWPF Slurry Mix Evaporator (SME) sampling process. The Hydragard, which is the current baseline sampling method, was used for comparison to the Isolok sampling data. The Isolok sampler is an air powered grab sampler used to 'pull' a sample volume from a process line. The operation of the sampler is shown in Figure 1. The image on the left shows the Isolok's spool extended into the process line and the image on the right shows the sampler retracted and then dispensing the liquid into the sampling container. To determine tank homogeneity, a Coliwasa sampler was used to grab samples at a high and low location within the mixing tank. Data from the two locations were compared to determine if the contents of the tank were well mixed. The Coliwasa sampler is a tube with a stopper at the bottom and is designed to obtain grab samples from specific locations within the drum contents. A position paper (4) was issued to address the prototypic flow loop issues and simulant selections. A statistically designed plan (5) was issued to address the total number of samples each sampler needed to pull, to provide the random order in which samples were pulled and to group samples for elemental analysis. The TTR required that the Isolok sampler perform as well as the Hydragard sampler during these tests to ensure the acceptability of the Isolok sampler for use in the DWPF sampling cells. Procedure No.L9.4-5015 was used to document the sample parameters and process steps. Completed procedures are located in R&D Engineering job folder 23269.

  19. Eaton Throat-Valve Element prototype concept. Phase 1

    SciTech Connect (OSTI)

    Stacey, M.R.; Arendts, J.G.; Berry, R.A.; Korth, G.E.; Schwieder, P.R.; Sekot, J.P.; Snow, S.D.

    1993-12-01T23:59:59.000Z

    As part of an ongoing effort to improve techniques for simulating nuclear blasts, the US Army Research Laboratory has been studying the merits of computer-controlled valves. The valve studies have been aimed at providing the Department of Defense with the capacity to conduct nuclear blast and thermal survivability testing on full-scale tactical vehicles. This report documents the development and findings of a computer model that simulates the behavior of the Eaton-Throat Valve Element (ETVE) prototype, and describes a proposed modification concept for the ETVE. The computer model reveals three main findings: (1) the ETVE chatters during the open cycle, (2) the chatter is caused by the high gas forces on the sliding sleeve as the driver gas passes through its portholes, and (3) the chatter is aggravated because there is insufficient damping in the system. The INEL recommends opening the ETVE by sliding the sleeve toward the downstream end of the valve instead of toward the upstream end, as the ETVE is presently configured, and to provide additional damping to the system. However, neither of these configuration changes can be achieved easily, and a redesign and analysis f the ETVE must be completed prior to performing any work on the current ETVE prototype. The ETVE simulation model proved to be an extremely valuable tool in analyzing the qualitative nature of the valve`s operation. Further development of the model is recommended for quantitative analysis and design of the ETVE. This report explains the model and stress analysis findings, and proposes a redesign concept.

  20. Experimental study on the cause of insufficiency of a transcutaneous pulmonary valve replacement

    E-Print Network [OSTI]

    Berlin,Technische Universität

    Experimental study on the cause of insufficiency of a transcutaneous pulmonary valve replacement for the replacement of pulmonary heart valves. This technique is a minimally invasive alternative to the replacement on known causes for insufficiencies of transcutaneous heart valve replacements. Out of that information

  1. Combined fast valving and braking resistor application to improve transient stability 

    E-Print Network [OSTI]

    Chen, Jen-Yeu Thomas

    1982-01-01T23:59:59.000Z

    would result in boiler safety valve operation which might require temporary plant shutdown for the reseating of these valves. The closing and opening of the control valve will sub]ect the boiler control to rather drastic action, and careful analysis...

  2. On the Design of an Interactive, Patient-Specific Surgical Simulator for Mitral Valve Repair

    E-Print Network [OSTI]

    On the Design of an Interactive, Patient-Specific Surgical Simulator for Mitral Valve Repair Neil A repair of the mitral valve is a difficult procedure that is often avoided in favor of less effective valve replacement because of the associated technical challenges facing non-expert surgeons

  3. Computational analysis of an aortic valve jet with Lagrangian coherent structures1

    E-Print Network [OSTI]

    Boyer, Edmond

    Computational analysis of an aortic valve jet with Lagrangian coherent structures1 Shawn C. Shadden valves. An important step in making these computational tools useful to clinical practice. This work focuses on flow through the aortic valve and il- lustrates how the computation of Lagrangian

  4. Electrical bistability and spin valve effect in a ferromagnet/organic semiconductor/ferromagnet heterojunction

    E-Print Network [OSTI]

    Eom, Chang Beom

    Letter Electrical bistability and spin valve effect in a ferromagnet/organic semiconductor online 2 April 2010 Keywords: Bistable device Spin valve Organic semiconductor Magnetoresistance a b s t r a c t We report a study of the electrical bistability and bias-controlled spin valve effect

  5. Chaotic Dynamics of Spin-Valve Oscillators Z. Yang and S. Zhang

    E-Print Network [OSTI]

    Li, Charles

    Chaotic Dynamics of Spin-Valve Oscillators Z. Yang and S. Zhang Department of Physics and Astronomy oscillators with tunable mi- crowave frequencies in spin valves are very desirable for magnetic storage it is not an intrinsic property of the current-driven oscillator. Here we consider a single-domain current-driven spin-valve

  6. SOFT SWITCHING APPROACH TO REDUCING TRANSITION LOSSES IN AN ON/OFF HYDRAULIC VALVE

    E-Print Network [OSTI]

    Li, Perry Y.

    SOFT SWITCHING APPROACH TO REDUCING TRANSITION LOSSES IN AN ON/OFF HYDRAULIC VALVE Michael B/off controlled hydraulic system is proposed. There has been a growing interest in the use of on/off valves to control hydraulic systems as a means of improving system efficiency. While on/off valves are efficient

  7. Quantification of Valve Stiction for Control Loop Performance Assessment Guohua Wang and liandong Wang*

    E-Print Network [OSTI]

    Wang, Jiandong

    Quantification of Valve Stiction for Control Loop Performance Assessment Guohua Wang and liandong, Beijing, P. R. China (*Email: jiandong@pku.edu.cn) Abstract - Control valves are extensively used in the process industry and valve stiction limits the performance of control loops. This study aims

  8. Large Spin Accumulation in a Permalloy-Silver Lateral Spin Valve T. Kimura and Y. Otani

    E-Print Network [OSTI]

    Otani, Yoshichika

    Large Spin Accumulation in a Permalloy-Silver Lateral Spin Valve T. Kimura and Y. Otani Institute accumulation due to the electrical spin injection has been observed in Permalloy-silver lateral spin-valve structures. The observed resistance change is the largest among the reported metallic lateral spin valves

  9. EXTRACTING GEOMETRIC FEATURES OF AORTIC VALVE ANNULUS MOTION FROM DYNAMIC MRI FOR GUIDING INTERVENTIONS

    E-Print Network [OSTI]

    Deng, Zhigang

    EXTRACTING GEOMETRIC FEATURES OF AORTIC VALVE ANNULUS MOTION FROM DYNAMIC MRI FOR GUIDING, Houston, TX 77030, USA ABSTRACT Transcatheter aortic valve implant (TAVI) has emerged as a prominent of the geometric features such as the diameter, center and orien- tation of the aortic valve annulus (AVA

  10. Magnetic domain wall propagation in a submicron spin-valve stripe: influence of the pinned layer

    E-Print Network [OSTI]

    Boyer, Edmond

    1/10 Magnetic domain wall propagation in a submicron spin-valve stripe: influence of the pinned ferromagnetic spin-valve stripe is investigated using giant magnetoresistance. A notch in the stripe efficiently generated in the vicinity of the notch by the pinned layer of the spin-valve. PACS: 72.25.Ba; 73.43.Qt; 75

  11. Aortic Valve Turning Over a New Leaf(let) in Endothelial Phenotypic Heterogeneity

    E-Print Network [OSTI]

    Simmons, Craig A.

    Aortic Valve Turning Over a New Leaf(let) in Endothelial Phenotypic Heterogeneity Peter F. Davies, Anthony G. Passerini, Craig A. Simmons A ortic valve diseases are debilitating cardiovascular disorders the longevity of replacement valves and to improve tissue engineered substitutes,1 the underlying mech- anisms

  12. Determination of magnetic vortex chirality using lateral spin-valve and Y. Otani

    E-Print Network [OSTI]

    Otani, Yoshichika

    Determination of magnetic vortex chirality using lateral spin-valve geometry T. Kimuraa and Y October 2005 We demonstrate the determination of the vortex chirality using a nonlocal spin-valve measurement technique in a lateral spin valve consisting of a Permalloy Py disk 1 m in diameter and a Py wire

  13. SOFT SWITCHING APPROACH TO REDUCING TRANSITION LOSSES IN AN ON/OFF HYDRAULIC VALVE

    E-Print Network [OSTI]

    Li, Perry Y.

    SOFT SWITCHING APPROACH TO REDUCING TRANSITION LOSSES IN AN ON/OFF HYDRAULIC VALVE Michael B system is proposed. There has been a growing interest in the use of on/off valves to control hydraulic systems as a means of improving system efficiency. While on/off valves are efficient when they are fully

  14. Image-based fluidstructure interaction model of the human mitral valve Xingshuang Ma a

    E-Print Network [OSTI]

    Luo, Xiaoyu

    Image-based fluid­structure interaction model of the human mitral valve Xingshuang Ma a , Hao Gao Available online 15 November 2012 Keywords: Human mitral valve Clinical imaging Magnetic resonance imaging Fluid­structure interaction Immersed boundary method a b s t r a c t The mitral valve (MV) is one

  15. Vascular Biology, Atherosclerosis and Endothelium Biology Identification and Characterization of Aortic Valve

    E-Print Network [OSTI]

    Simmons, Craig A.

    of Aortic Valve Mesenchymal Progenitor Cells with Robust Osteogenic Calcification Potential Jan-Hung Chen by an unidentified multipotent progenitor subpopulation within the valve interstitium. The identity, frequency were to determine whether valve intersti- tial cells (VICs) contain a subpopulation of multipo- tent

  16. Controlling flow in microfluidic channels with a manually actuated pin valve

    E-Print Network [OSTI]

    Eddington, David T.

    Controlling flow in microfluidic channels with a manually actuated pin valve Marie-Elena Brett to be placed within the microchannel to obstruct flow. This new valve design can attain on/off control of fluid flow without an external power source using readily-available, low-cost materials. The valve consists

  17. A Computational Model of Aging and Calcification in the Aortic Heart Valve

    E-Print Network [OSTI]

    Mofrad, Mohammad R. K.

    A Computational Model of Aging and Calcification in the Aortic Heart Valve Eli J. Weinberg1 of America Abstract The aortic heart valve undergoes geometric and mechanical changes over time. The cusps of a normal, healthy valve thicken and become less extensible over time. In the disease calcific aortic

  18. Potential Viability of a Fast-Acting Micro-Solenoid Valve for Pulsed Detonation Fuel Injection

    E-Print Network [OSTI]

    Texas at Arlington, University of

    1 Potential Viability of a Fast-Acting Micro-Solenoid Valve for Pulsed Detonation Fuel Injection F-acting solenoid valves to meet the demands of pulsed detonation fuel injection and other high-frequency devices is presented. The micro-valve was found to performance well above the manufacturer's rated frequency under no

  19. Spin-current-induced dynamics in ferromagnetic nanopillars of lateral spin-valve structures

    E-Print Network [OSTI]

    Otani, Yoshichika

    Spin-current-induced dynamics in ferromagnetic nanopillars of lateral spin-valve structures J 4 February 2009 Under electrical injection, spin accumulation occurs in lateral spin valves in a lateral spin valve while simultaneously sweeping an external magnetic field. We observe changes

  20. Title: Predictors of 6-months clinical poor outcomes after transcatheter aortic valve implantation.

    E-Print Network [OSTI]

    Boyer, Edmond

    1 Title: Predictors of 6-months clinical poor outcomes after transcatheter aortic valve.acvd.2013.10.005 #12;2 Abstract Background: Patients' selection for transcatheter aortic valve implantation institution with a transcatheter-implanted aortic valve were prospectively followed. Our population

  1. Scaling properties of a low-actuation pressure microfluidic valve Vincent Studer and Giao Hang

    E-Print Network [OSTI]

    Ortiz, Michael

    Scaling properties of a low-actuation pressure microfluidic valve Vincent Studer and Giao Hang a design and method for the fabrication of microfluidic valves using multilayer soft lithography. These on-off valves have extremely low actuation pressures and can be used to fabricate active functions

  2. Fast Interactive Simulations of Mitral Valve Repair Neil A. Tenenholtz, Peter E. Hammer, Robert D. Howe

    E-Print Network [OSTI]

    Fast Interactive Simulations of Mitral Valve Repair Neil A. Tenenholtz, Peter E. Hammer, Robert D. Howe Keywords: Surgical simulation, human-computer interaction, haptics, mitral valve, cardiac surgery. I. Problem Solved A healthy mitral valve ensures the one-way flow of oxygenated blood from the left

  3. Closed-Loop Compensation Method for Oscillations Caused by Control Valve Stiction

    E-Print Network [OSTI]

    Wang, Jiandong

    Closed-Loop Compensation Method for Oscillations Caused by Control Valve Stiction Jiandong Wang-loop compensation method to remove oscillations caused by control valve stiction. With the control loop operating movements for the control valve to arrive at a desired position. A systematic way to design the parameters

  4. Quantification of Mitral Valve Morphology with Three-dimensional Echocardiography: Can Measurement Lead to

    E-Print Network [OSTI]

    Wong, Kenneth K.Y.

    ForReview Only Quantification of Mitral Valve Morphology with Three- dimensional Echocardiography. of Medicine & Therapeutics Keywords: mitral valve, echocardiography, imaging Category: Diagnostic imaging/Nuclear medicine Japanese Circulation Society Circulation Journal #12;ForReview Only Quantification of Mitral Valve

  5. T EFFECT OF STORAGE ON TENSILE PROPERTIES OF NATURAL HEART VALVE TISSUE

    E-Print Network [OSTI]

    Stevenson, Paul

    T EFFECT OF STORAGE ON TENSILE PROPERTIES OF NATURAL HEART VALVE TISSUE Sophia Nishat Mohammad "" Yourheartisyourlanternandyourselfisyourlight. ( IQBAL the poet of the east ) #12;ABSTRACT Aortic homograft valves are the preferred choiceof replacementvalve in aortic valve replacementprocedures.The major drawbackto their use is their availability

  6. Using Real-Time Three-Dimensional Ultrasound to Characterize Mitral Valve Motion

    E-Print Network [OSTI]

    Ayache, Nicholas

    Using Real-Time Three-Dimensional Ultrasound to Characterize Mitral Valve Motion Paul M. Novotnya results aim to fully characterize the four-dimensional (3D + time) movement of the mitral valve for better understanding of its behavior prior to surgical interventions, such as mitral valve repair. A behavior model

  7. VALVE: Variable Length Value Encoder for Off-Chip Data Buses. Dinesh C. Suresh, Banit Agrawal*

    E-Print Network [OSTI]

    Najjar, Walid A.

    VALVE: Variable Length Value Encoder for Off-Chip Data Buses. Dinesh C. Suresh, Banit Agrawal (VALVE) technique to reduce the power consumption in the off-chip data buses. While past research has proposed scheme is capable of detecting and encoding variable length bit patterns in the data values. VALVE

  8. MODELING AND VALIDATION OF A HIGH SPEED ROTARY PWM ON/OFF VALVE Haink C. Tu

    E-Print Network [OSTI]

    Li, Perry Y.

    MODELING AND VALIDATION OF A HIGH SPEED ROTARY PWM ON/OFF VALVE Haink C. Tu Center for Compact-speed on/off valves are a critical technology for enabling digital control of hydraulic systems via pulse-width- modulation (PWM). High-speed valves, when used in virtually variable displacement pumps (VVDP), increase

  9. Magnetization process of a single magnetic ring detected by nonlocal spin valve measurement

    E-Print Network [OSTI]

    Otani, Yoshichika

    Magnetization process of a single magnetic ring detected by nonlocal spin valve measurement T of a 200-nm-wide Permalloy ring using a nonlocal spin-valve measurement technique in a lateral geometry state using lateral spin-valve geometry.13­15 The chirality is found to be easily determined from

  10. LOWER TRANSIENT STRESSES IN AN AORTIC VALVE LEAFLET WITH OBLIQUE REINFORCEMENT FIBERS: A FINITE ELEMENT STUDY

    E-Print Network [OSTI]

    LOWER TRANSIENT STRESSES IN AN AORTIC VALVE LEAFLET WITH OBLIQUE REINFORCEMENT FIBERS: A FINITE Cambridge, MA, USA INTRODUCTION Native aortic valve leaflets contain a network of strong collagen fibers the stresses of cyclic loading over billions of heart beats. Replacement valves that consist of animal tissues

  11. Sensors and Actuators A 136 (2007) 426433 A bi-polymer micro one-way valve

    E-Print Network [OSTI]

    Beebe, David J.

    2007-01-01T23:59:59.000Z

    Sensors and Actuators A 136 (2007) 426­433 A bi-polymer micro one-way valve Dongshin Kima,b,, David December 2006 Abstract We have developed an in-plane bi-polymer check-valve for controlling microfluidic hydrogel. The valve was created using microfluidic tectonics, a fabrication procedure that allows

  12. Monovalve with integrated fuel injector and port control valve, and engine using same

    DOE Patents [OSTI]

    Milam, David M. (Metamora, IL)

    2002-01-01T23:59:59.000Z

    Each cylinder of an internal combustion engine includes a combined gas exchange valve and fuel injector with a port control valve. The port control valve operates to open either an intake passage or an exhaust passage. The operation of the combined device is controlled by a pair of electrical actuators. The device is hydraulically actuated.

  13. APPLICATION OF BUTTERFLY VALVES FOR FREE DISCHARGE, MINIMUM PRESSURE DROP, AND FOR CHOKING CAVITATION

    E-Print Network [OSTI]

    Rahmeyer, William J.

    CAVITATION Butterfly valves are commonly used as control valves in applications where the pressure drops and the use of a butterfly valve for flashing or choking cavitation service. Free discharge typically produces high pipe velocities at moderate pressure drops, and choking cavitation typically produces high

  14. Selecting the right pumps and valves for flue gas desulfurization

    SciTech Connect (OSTI)

    Ellis, D.; Ahluwalia, H. [ITT Engineered Valves, Lancaster, PA (United States)

    2006-07-15T23:59:59.000Z

    Limestone slurry needs to move efficiently through a complex process, meaning that selecting the right pumps and valves is critical. The article discusses factors to consider in selecting pumps and values for flue gas desulfurization process in coal-fired power plants. 2 photos.

  15. Covered Product Category: Pre-Rinse Spray Valves

    Broader source: Energy.gov [DOE]

    The Federal Energy Management Program (FEMP) provides acquisition guidance and Federal efficiency requirements across a variety of product categories, including pre-rinse spray valves, which are a FEMP-designated product category. Federal laws and requirements mandate that agencies meet these efficiency requirements in all procurement and acquisition actions that are not specifically exempted by law.

  16. Workshop on gate valve pressure locking and thermal binding

    SciTech Connect (OSTI)

    Brown, E.J.

    1995-07-01T23:59:59.000Z

    The purpose of the Workshop on Gate Valve Pressure Locking and Thermal Binding was to discuss pressure locking and thermal binding issues that could lead to inoperable gate valves in both boiling water and pressurized water reactors. The goal was to foster exchange of information to develop the technical bases to understand the phenomena, identify the components that are susceptible, discuss actual events, discuss the safety significance, and illustrate known corrective actions that can prevent or limit the occurrence of pressure locking or thermal binding. The presentations were structured to cover U.S. Nuclear Regulatory Commission staff evaluation of operating experience and planned regulatory activity; industry discussions of specific events, including foreign experience, and efforts to determine causes and alleviate the affects; and valve vendor experience and recommended corrective action. The discussions indicated that identifying valves susceptible to pressure locking and thermal binding was a complex process involving knowledge of components, systems, and plant operations. The corrective action options are varied and straightforward.

  17. Downhole safety valve for subterranean well and method

    SciTech Connect (OSTI)

    Eriksen, E.P.V.; Drakeley, B.K.; Carmody, M.A.

    1990-07-31T23:59:59.000Z

    This patent describes a method of establishing communication with a control fluid conduit provided in the tubular wall of a fluid pressure operated downhole tool. Also described is apparatus for effecting the downhole severing of a radially, inwardly directed hollow protuberance on the tubular wall of a valve housing, the tubular wall also defining a no-go shoulder above the protuberance.

  18. Depth Profiling Photoelectron-Spectroscopic Study of an Organic Spin Valve with a Plasma-Modified Pentacene Spacer

    E-Print Network [OSTI]

    Lin, Minn-Tsong

    Depth Profiling Photoelectron-Spectroscopic Study of an Organic Spin Valve with a Plasma) in an organic spin valve with an oxygen plasma-treated pentacene (PC) spacer. The spin valve containing PC and in turn to enhance the MR performance in organic spin valves. INTRODUCTION Organic semiconductors (OSC

  19. Proximity effects in superconducting triplet spin-valve F2/F1/S R.G. Deminov a,n

    E-Print Network [OSTI]

    Fominov, Yakov

    Proximity effects in superconducting triplet spin-valve F2/F1/S R.G. Deminov a,n , L.R. Tagirov a effect Superconducting Ferromagnetic Triplet spin-valve Magnetization Transition temperature Interface of the spin-valve effect mode selection (standard switching effect, the triplet spin-valve effect or reentrant

  20. Measurement of spin diffusion length in sputtered Ni films using a special exchange-biased spin valve geometry

    E-Print Network [OSTI]

    Birge, Norman

    valve geometry Charles E. Moreaua Department of Physics, Albion College, Albion, Michigan 49224 Ion C exchange-biased spin valve geometry that inserts a Ni "spoiler" layer into a Py/Cu/Py spin valve. Fits In the context of ferromagnetic/nonmagnetic F/N multilayers or spin valves, the size of the giant

  1. Mitral Web -A New Concept for Mitral Valve Repair: Improved Engineering Design and In-Vitro Studies

    E-Print Network [OSTI]

    Pekkan, Kerem

    Mitral Web - A New Concept for Mitral Valve Repair: Improved Engineering Design and In of Biomedical Engineering, Georgia Institute of Technology, GA, USA Myxomatous mitral valve disease is currently reported that mitral valve repair is preferable to valve replace- ment, as it offers certain advantages

  2. A novel mathematical technique to assess of the mitral valve dynamics based on echocardiography

    E-Print Network [OSTI]

    Karvandi, Mersedeh; Hassantash, Seyed Ahmad; Foroughi, Mahnoosh

    2015-01-01T23:59:59.000Z

    Purpose: The mechanics of the mitral valve leaflet as a nonlinear, inelastic and anisotropic soft tissue results from an integrated response of many mathematical/physical indexes' that illustrate the tissue. In the past decade, finite element modeling of complete heart valves has greatly aided evaluation of heart valve surgery, design of bioprosthetic valve replacements, and general understanding of healthy and abnormal cardiac function. Such a model must be based on an accurate description of the mechanical behavior of the valve material. It is essential to calculate velocity/displacement and strain rate/strain at a component level that is to work at the cellular level. In this study we developed the first three-dimensional displacement vectors field in the characterization of mitral valve leaflets in continuum equations of inelasticity framework based on echocardiography. Method: Much of our knowledge of abnormal mitral valve function is based on surgical and post-mortem studies while these studies are quan...

  3. Electron-electron interaction, weak localization and spin valve effect in vertical-transport graphene devices

    SciTech Connect (OSTI)

    Long, Mingsheng; Gong, Youpin; Wei, Xiangfei; Zhu, Chao; Xu, Jianbao; Liu, Ping; Guo, Yufen; Li, Weiwei; Liu, Liwei, E-mail: lwliu2007@sinano.ac.cn [Key Laboratory of Nanodevices and Applications-CAS and Collaborative Innovation Center of Suzhou Nano Science and Technology, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences (CAS), Suzhou 215123 (China); Liu, Guangtong [Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)

    2014-04-14T23:59:59.000Z

    We fabricated a vertical structure device, in which graphene is sandwiched between two asymmetric ferromagnetic electrodes. The measurements of electron and spin transport were performed across the combined channels containing the vertical and horizontal components. The presence of electron-electron interaction (EEI) was found not only at low temperatures but also at moderate temperatures up to ?120?K, and EEI dominates over weak localization (WL) with and without applying magnetic fields perpendicular to the sample plane. Moreover, spin valve effect was observed when magnetic filed is swept at the direction parallel to the sample surface. We attribute the EEI and WL surviving at a relatively high temperature to the effective suppress of phonon scattering in the vertical device structure. The findings open a way for studying quantum correlation at relatively high temperature.

  4. Fuel injection of coal slurry using vortex nozzles and valves

    DOE Patents [OSTI]

    Holmes, Allen B. (Rockville, MD)

    1989-01-01T23:59:59.000Z

    Injection of atomized coal slurry fuel into an engine combustion chamber is achieved at relatively low pressures by means of a vortex swirl nozzle. The outlet opening of the vortex nozzle is considerably larger than conventional nozzle outlets, thereby eliminating major sources of failure due to clogging by contaminants in the fuel. Control fluid, such as air, may be used to impart vorticity to the slurry and/or purge the nozzle of contaminants during the times between measured slurry charges. The measured slurry charges may be produced by a diaphragm pump or by vortex valves controlled by a separate control fluid. Fluidic circuitry, employing vortex valves to alternatively block and pass cool slurry fuel flow, is disclosed.

  5. Development of Glassy Carbon Blade for LHC Fast Vacuum Valve

    E-Print Network [OSTI]

    Coly, P

    2012-01-01T23:59:59.000Z

    An unexpected gas inrush in a vacuum chamber leads to the development of a fast pressure wave. It carries small particles that can compromise functionality of sensitive machine systems such as the RF cavities or kickers. In the LHC machine, it has been proposed to protect this sensitive equipment by the installation of fast vacuum valves. The main requirements for the fast valves and in particular for the blade are: fast closure in the 20 ms range, high transparency and melting temperature in case of closure with beam in, dust free material to not contaminate sensitive adjacent elements, and last but not least vacuum compatibility and adequate leak tightness across the blade. In this paper, different designs based on a vitreous carbon blade are presented and a solution is proposed. The main reasons for this material choice are given. The mechanical study of the blade behaviour under dynamic forces is shown.

  6. Spin transport in benzofurane bithiophene based organic spin valves

    SciTech Connect (OSTI)

    Palosse, Mathieu; Séguy, Isabelle; Bedel-Pereira, Élena [CNRS, LAAS, 7 avenue du Colonel Roche, F-31400 Toulouse (France) [CNRS, LAAS, 7 avenue du Colonel Roche, F-31400 Toulouse (France); Université de Toulouse (France); UPS, INSA, INP, ISAE (France); LAAS (France) [France; CEMES, F-31077 Toulouse (France)] [France; Villeneuve-Faure, Christina [Université de Toulouse (France) [Université de Toulouse (France); UPS, INSA, INP, ISAE (France); LAAS (France) [France; CEMES, F-31077 Toulouse (France) [France; LAPLACE, Université Paul Sabatier, 118, route de Narbonne 31062 Toulouse Cedex 9 (France); Mallet, Charlotte; Frère, Pierre [MOLTECH-Anjou, UMR CNRS 6200, Université d’Angers, 2 Bd Lavoisier 49045 ANGERS Cedex (France)] [MOLTECH-Anjou, UMR CNRS 6200, Université d’Angers, 2 Bd Lavoisier 49045 ANGERS Cedex (France); Warot-Fonrose, Bénédicte; Biziere, Nicolas [Université de Toulouse (France) [Université de Toulouse (France); UPS, INSA, INP, ISAE (France); LAAS (France) [France; CEMES, F-31077 Toulouse (France) [France; CNRS, CEMES-CNRS UPR 8011, 29 rue Jeanne Marvig, BP 94347, FR-31055 Toulouse Cedex 4 (France); Bobo, Jean-François, E-mail: jfbobo@cemes.fr [Université de Toulouse (France) [Université de Toulouse (France); UPS, INSA, INP, ISAE (France); LAAS (France) [France; CEMES, F-31077 Toulouse (France) [France; CNRS, CEMES-ONERA, NMH, 2 avenue Edouard Belin, FR-31055 Toulouse Cedex 4 (France)

    2014-01-15T23:59:59.000Z

    In this paper we present spin transport in organic spin-valves using benzofurane bithiophene (BF3) as spacer layer between NiFe and Co ferromagnetic electrodes. The use of an AlO{sub x} buffer layer between the top electrode and the organic layer is discussed in terms of improvements of stacking topology, electrical transport and oxygen contamination of the BF3 layer. A study of magnetic hysteresis cycles evidences spin-valve behaviour. Transport properties are indicative of unshorted devices with non-linear I-V characteristics. Finally we report a magnetoresistance of 3% at 40 K and 10 mV in a sample with a 50 nm thick spacer layer, using an AlO{sub x} buffer layer.

  7. Removable check valve for use in a nuclear reactor

    DOE Patents [OSTI]

    Dunn, Charlton (Calabasas, CA); Gutzmann, Edward A. (Simi Valley, CA)

    1988-01-01T23:59:59.000Z

    A removable check valve for interconnecting the discharge duct of a pump and an inlet coolant duct of a reactor core in a pool-type nuclear reactor. A manifold assembly is provided having an outer periphery affixed to and in fluid communication with the discharge duct of the pump and has an inner periphery having at least one opening therethrough. A housing containing a check valve is located within the inner periphery of the manifold. The upper end of the housing has an opening in alignment with the opening in the manifold assembly, and seals are provided above and below the openings. The lower end of the housing is adapted for fluid communication with the inlet duct of the reactor core.

  8. Optimized fabrication and characterization of carbon nanotube spin valves

    SciTech Connect (OSTI)

    Samm, J.; Gramich, J.; Baumgartner, A., E-mail: andreas.baumgartner@unibas.ch; Weiss, M.; Schönenberger, C. [Institute of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel (Switzerland)

    2014-05-07T23:59:59.000Z

    We report an improved fabrication scheme for carbon based nanospintronic devices and demonstrate the necessity for a careful data analysis to investigate the fundamental physical mechanisms leading to magnetoresistance. The processing with a low-density polymer and an optimised recipe allows us to improve the electrical, magnetic, and structural quality of ferromagnetic Permalloy contacts on lateral carbon nanotube (CNT) quantum dot spin valve devices, with comparable results for thermal and sputter deposition of the material. We show that spintronic nanostructures require an extended data analysis, since the magnetization can affect all characteristic parameters of the conductance features and lead to seemingly anomalous spin transport. In addition, we report measurements on CNT quantum dot spin valves that seem not to be compatible with the orthodox theories for spin transport in such structures.

  9. A WEAR MODEL FOR DIESEL ENGINE EXHAUST VALVES

    SciTech Connect (OSTI)

    Blau, Peter Julian [ORNL

    2009-11-01T23:59:59.000Z

    The work summarized here comprises the concluding effort of a multi-year project, funded by the U.S. Department of Energy, Office of Vehicle Technologies. It supports the development of a better understanding of advanced diesel engine designs in which enhanced power density, energy efficiency, and emissions control place increasing demands upon the durability of engine materials. Many kinds of metallic alloys are used in engines depending on the operating stresses, temperatures, and chemical environments. Exhaust valves, for example, are subjected to high temperatures and repetitive surface contacts that place demands on durability and frictional characteristics of the materials. Valves must continue to seal the combustion chamber properly for thousands of hours of cyclic engine operation and under varying operating conditions. It was the focus of this effort to understand the wear processes in the valve-seat area and to develop a model for the surface deformation and wear of that important interface. An annotated bibliography is provided to illustrate efforts to understand valve wear and to investigate the factors of engine operation that affect its severity and physical manifestation. The project for which this modeling effort was the final task, involved construction of a high-temperature repetitive impact test system as well as basic tribology studies of the combined processes of mechanical wear plus oxidation at elevated temperatures. Several publications resulted from this work, and are cited in this report. The materials selected for the experimental work were high-performance alloys based on nickel and cobalt. In some cases, engine-tested exhaust valves were made available for wear analysis and to ensure that the modes of surface damage produced in experiments were simulative of service. New, production-grade exhaust valves were also used to prepare test specimens for experimental work along with the other alloy samples. Wear analysis of valves and seats run for hundreds of hours in heavy-duty diesels provided insights into the kinds of complexity that the contact conditions in engines can produce, and suggested the physical basis for the current approach to modeling. The model presented here involves four terms, two representing the valve response and two for its mating seat material. The model's structure assumes that wear that takes place under a complex combination of plastic deformation, tangential shear, and oxidation. Tribolayers form, are removed, and may reform. Layer formation affects the friction forces in the interface, and in turn, the energy available to do work on the materials to cause wear. To provide friction data for the model at various temperatures, sliding contact experiments were conducted from 22 to 850 C in a pin-on-disk apparatus at ORNL. In order to account for the behavior of different materials and engine designs, parameters in all four terms of the model can be adjusted to account for wear-in and incubation periods before the dominant wear processes evolve to their steady-state rates. For example, the deformation rate is assumed to be maximum during the early stages of operation, and then, due to material work-hardening and the increase in nominal contact area (which reduces the load per unit area), decreases to a lower rate at long times. Conversely, the rate of abrasion increases with time or number of cycles due to the build-up of oxides and tribo-layers between contact surfaces. The competition between deformation and abrasion results in complex, non-linear behavior of material loss per cycle of operation. Furthermore, these factors are affected by valve design features, such as the angle of incline of the valve seat. Several modeling scenarios are presented to demonstrate how the wear profile versus number of cycles changes in response to: (a) different relative abrasion rates of the seat and valve materials, (b) the friction coefficient as a function of temperature, (c) the relative deformation contribution of valve and seat materials, and (d) an interruption in the dominant we

  10. Sliding-gate valve for use with abrasive materials

    DOE Patents [OSTI]

    Ayers, Jr., William J. (Morgantown, WV); Carter, Charles R. (Fairmont, WV); Griffith, Richard A. (Morgantown, WV); Loomis, Richard B. (Bruceton Mills, WV); Notestein, John E. (Morgantown, WV)

    1985-01-01T23:59:59.000Z

    The invention is a flow and pressure-sealing valve for use with abrasive solids. The valve embodies special features which provide for long, reliable operating lifetimes in solids-handling service. The valve includes upper and lower transversely slidable gates, contained in separate chambers. The upper gate provides a solids-flow control function, whereas the lower gate provides a pressure-sealing function. The lower gate is supported by means for (a) lifting that gate into sealing engagement with its seat when the gate is in its open and closed positions and (b) lowering the gate out of contact with its seat to permit abrasion-free transit of the gate between its open and closed positions. When closed, the upper gate isolates the lower gate from the solids. Because of this shielding action, the sealing surface of the lower gate is not exposed to solids during transit or when it is being lifted or lowered. The chamber containing the lower gate normally is pressurized slightly, and a sweep gas is directed inwardly across the lower-gate sealing surface during the vertical translation of the gate.

  11. Control Valve Trajectories for SOFC Hybrid System Startup

    SciTech Connect (OSTI)

    Gorrell, Megan; Banta, Larry; Rosen, William; Restrepo, Bernardo; Tucker, David

    2012-07-01T23:59:59.000Z

    Control and management of cathode airflow in a solid oxide fuel cell gas turbine hybrid power system was analyzed using the Hybrid Performance (HyPer) hardware simulation at the National Energy Technology (NETL), U.S. Department of Energy. This work delves into previously unexplored operating practices for HyPer, via simultaneous manipulation of bypass valves and the electric load on the generator. The work is preparatory to the development of a Multi-Input, Multi-Output (MIMO) controller for HyPer. A factorial design of experiments was conducted to acquire data for 81 different combinations of the manipulated variables, which consisted of three air flow control valves and the electric load on the turbine generator. From this data the response surface for the cathode airflow with respect to bypass valve positions was analyzed. Of particular interest is the control of airflow through the cathode during system startup and during large load swings. This paper presents an algorithm for controlling air mass flow through the cathode based on a modification of the steepest ascent method.

  12. Valve device for increasing the fuel economy and reducing the emissions from an internal combustion engine

    SciTech Connect (OSTI)

    Mac Guire, A.E.

    1987-10-27T23:59:59.000Z

    A valve device is described comprising a valve chamber having a main entry orifice and an exit orifice. Valve means within the chamber intermediate the main entry orifice and exit orifice are responsive to a vacuum at the exit orifice to produce a substantially constant pulsating air flow through the valve. Supplemental entry orifice means communicates with the chamber for imparting a range or spread of frequencies to the pulsating air flow through the valve. The valve means includes an imperforate spherical member with in the chamber intermediate the exit orifice and the main entry orifice and the supplemental entry orifice means. The supplemental entry orifice means comprises at least one supplemental entry orifice to the chamber. The main entry orifice has a greater diameter than the supplemental entry orifice.

  13. Proceedings of EPRI/DOE workshop on nuclear industry valve problems

    SciTech Connect (OSTI)

    Sprung, J.L. (ed.) [ed.

    1981-01-01T23:59:59.000Z

    Representatives from 29 nuclear industry organizations (11 valve manufacturers, 4 nuclear steam supply system vendors, 5 utilities, 3 national laboratories, 2 architect/engineering firms, the Department of Energy (DOE), EPRI, and 2 others) attended the workshop. Working sessions on key valves and on valve stem and seat leakage developed the following recommendations: (1) establish a small permanent expert staff to collect, analyze, and disseminate information about nuclear valve problems; (2) perform generic key valve programs for pressurized water reactors and for boiling water reactors, and several plant specific key valve programs, the latter to demonstrate the cost-effectiveness of such studies; (3) confirm the identity of, define, and initiate needed longer term research and development programs dealing with seat and stem leakage; and (4) establish an industry working group to review and advise on these efforts. Separate abstracts were prepared for three papers which are included in the appendix. (DLC)

  14. Development of a thyristor valve for next generation 500kV HVDC transmission systems

    SciTech Connect (OSTI)

    Hasegawa, T. [Kansai Electric Power Co., Inc., Osaka (Japan)] [Kansai Electric Power Co., Inc., Osaka (Japan); Yamaji, K. [Shikoku Electric Power Co., Inc., Takamatsu (Japan)] [Shikoku Electric Power Co., Inc., Takamatsu (Japan); Irokawa, H. [Electric Power Development Co., Ltd., Tokyo (Japan)] [Electric Power Development Co., Ltd., Tokyo (Japan); Shirahama, H.; Tanaka, C.; Akabane, K.

    1996-10-01T23:59:59.000Z

    A high voltage thyristor valve is the basic component of an HVDC transmission system. Development of a 500kV valve for next generation HVDC transmission systems is described. First, the power loss of the valve is analyzed to decide a reasonable wafer size for the light triggered thyristor. From these results, a six inch diameter wafer size is selected. The light triggered thyristor, with ratings of 8kV and 3.5kA, is developed using the six inch wafer. The designing of the valve employing the thyristor and test results with the prototype valve prove that a 500kV valve can be realized by the design method.

  15. Using the Oxygen Plasma Machine 1. Turn on the O2 (g) valve on the wall.

    E-Print Network [OSTI]

    Using the Oxygen Plasma Machine 1. Turn on the O2 (g) valve on the wall. 2. Turn on the O2 inlet valve on the front of the machine just a tiny-bit ­ O2 should now be leaking through the black, chamber-right of the machine), just the Red Power Switch. 6. Turn off the O2 valve on the chamber door. At the same time, turn

  16. Means for positively seating a piezoceramic element in a piezoelectric valve during inlet gas injection

    DOE Patents [OSTI]

    Wright, K.E.

    1994-08-23T23:59:59.000Z

    A piezoelectric valve in a gas delivery system includes a piezoceramic element bonded to a valve seal and disposed over a valve seat, and retained in position by an O-ring and a retainer; an insulating ball normally biased by a preload spring against the piezoceramic element; an inlet gas port positioned such that upon admission of inlet gas into the valve, the piezoceramic element is positively seated. The inlet gas port is located only on the side of the piezoceramic element opposite the seal. 3 figs.

  17. Operational experience using the novel FixCup collecting main valve

    SciTech Connect (OSTI)

    Giertz, J.; Huhn, F. [DMT-Gesellschaft fuer Forschung und Pruefung mbH, Essen (Germany). Inst. for Cokemaking and Fuel Technology; Spitz, J. [Thyssen Stahl AG, Duisburg (Germany)

    1996-12-31T23:59:59.000Z

    On the occasion of the 1995 AIME conference the new PROven (Pressure Regulated Oven) process to control the pressure in coke ovens individually was introduced. This process was made feasible with a new collecting main valve, termed FixCup, with the aid of this valve a variable flow resistance to the raw gas discharge can be realized using a water immersion system. However, just the application of the FixCup system alone--without any pressure regulation--is very advantageous and cost saving. Thyssen has equipped 30 ovens with the new valve. The special constructive features as well as the operational experience using the FixCup valve are treated.

  18. Valve performance concept move from preventive to condition-oriented maintenance

    SciTech Connect (OSTI)

    Zanner, G.; Kradepohl, P.

    1996-12-01T23:59:59.000Z

    As a turnkey supplier of nuclear and fossil power plants, Siemens must pay attention in concentrating, maintaining, and developing the expertise in many areas such as system design, components, materials, quality assurance, and qualification testing within centralized organizations. In the company segment VALVES, Siemens/KWU is staffed with experienced professionals who have serviced the power plant industry for about 25 years. The valve engineers deal with all kinds of valve and actuator-related activities like design ratings, development, qualifications, and ongoing improvements. In this regard, the engineers are involved in nearly all actual problems and suggested solutions through continuing dialogues with utilities, authorities, and vendors of valves and actuators.

  19. Purchasing Water-Efficient Faucets, Pre-Rinse Spray Valves, Showerhead...

    Energy Savers [EERE]

    Products & Technologies Energy-Efficient Products Purchasing Water-Efficient Faucets, Pre-Rinse Spray Valves, Showerheads, Toilets, and Urinals Purchasing Water-Efficient...

  20. Endothelial Progenitor Cells as a Sole Source for Ex Vivo Seeding of Tissue-Engineered Heart Valves

    E-Print Network [OSTI]

    Sales, Virna L.

    Purposes: We investigated whether circulating endothelial progenitor cells (EPCs) can be used as a cell source for the creation of a tissue-engineered heart valve (TEHV). Methods: Trileaflet valved conduits were fabricated ...

  1. Use of duplex stainless steel castings in control valves

    SciTech Connect (OSTI)

    Gossett, J.L. [Fisher Controls International, Inc., Marshalltown, IA (United States)

    1996-07-01T23:59:59.000Z

    Duplex stainless steels have enjoyed rapidly increasing popularity in recent years. For numerous reasons the availability of these alloys in the cast form has lagged behind the availability of the wrought form. Commercial demand for control valves in these alloys has driven development of needed information to move into production. A systematic approach was used to develop specifications, suppliers and weld procedures. Corrosion, stress corrosion cracking (SCC), sulfide stress cracking (SSC) and hardness results are also presented for several alloys including; CD3MN (UNS J92205), CD4MCu (UNS J93370) and CD7MCuN (cast UNS S32550).

  2. Wakefield induced Losses in the Manual Valves of the TESLA Cryomodule

    E-Print Network [OSTI]

    1 Wakefield induced Losses in the Manual Valves of the TESLA Cryomodule M.Dohlus,H.-P.Wedekind,K.Zapfe DeutschesElektronenSynchrotron Notkestr.85,D-22603Hamburg,Germany Abstract The beam pipe of the TESLA valves with spring type rf-shield which are presently used in the linac of the TESLA Test Facility

  3. Cost effective combined axial fan and throttling valve control of ventilation rate

    E-Print Network [OSTI]

    Sengun, Mehmet Haluk

    Cost effective combined axial fan and throttling valve control of ventilation rate C.J. Taylor 1 P with Proportional-Integral-Plus (PIP) control of ventilation rate in mechanically ventilated agricultural buildings ventilation. The new combined fan/valve configuration is compared with a commercially available PID

  4. Rendering the Electromechanical Valve Actuator Globally Asymptotically Stable Katherine S. Peterson and Anna G. Stefanopoulou*

    E-Print Network [OSTI]

    Sontag, Eduardo

    Rendering the Electromechanical Valve Actuator Globally Asymptotically Stable Katherine S. Peterson on Sontag's feedback to render the electromechanical valve actuator (EVA) globally asymptotically stable on a linearized plant model. Here, we demonstrate and prove that our controller renders the system GAS without any

  5. Microfluidic very large scale integration (mVLSI) with integrated micromechanical valves{

    E-Print Network [OSTI]

    Quake, Stephen R.

    Microfluidic very large scale integration (mVLSI) with integrated micromechanical valves{ Ismail40258k Microfluidic chips with a high density of control elements are required to improve device and accessible high-density microfluidic chips, we have fabricated a monolithic PDMS valve architecture

  6. Proceedings of the 2nd symposium on valves for coal conversion and utilization

    SciTech Connect (OSTI)

    Maxfield, D.A. (ed.)

    1981-01-01T23:59:59.000Z

    The 2nd symposium on valves for coal conversion and utilization was held October 15 to 17, 1980. It was sponsored by the US Department of Energy, Morgantown Energy Technology Center, in cooperation with the Valve Manufacturers Association. Seventeen papers have been entered individually into EDB and ERA. (LTN)

  7. Microstructural study of ion-beam deposited giant magnetoresistive spin valves

    E-Print Network [OSTI]

    Laughlin, David E.

    Avenue South, Minneapolis, Minnesota 55435 Detailed microstructural investigation of ion beam deposited exchanged field and R/R of the spin valves. © 1997 American Institute of Physics. S0021-8979 97 32708-X that by sputter deposition.3 This may be beneficial to the integration of the spin-valve element with other head

  8. Passivity based compressor surge control using a close-coupled valve

    E-Print Network [OSTI]

    Gravdahl, Jan Tommy

    Passivity based compressor surge control using a close-coupled valve Jan Tommy Gravdahl and Olav Passivity-based control of a second order compressor surge model is investi- gated using a close controller for the close- coupled valve. 1 Introduction If the ow through a compressor is throttled

  9. Nanostructural considerations in giant magnetoresistive Co-Cu-based symmetric spin valves Harsh Deep Chopra*

    E-Print Network [OSTI]

    Chopra, Harsh Deep

    , for example, magnetic-field sensors and read-heads in data- storage devices.11 A key impedimentNanostructural considerations in giant magnetoresistive Co-Cu-based symmetric spin valves Harsh, on the nanostructure and resulting giant magnetoresistive properties of symmetric spin valves of the type Ni

  10. System for detecting operating errors in a variable valve timing engine using pressure sensors

    DOE Patents [OSTI]

    Wiles, Matthew A.; Marriot, Craig D

    2013-07-02T23:59:59.000Z

    A method and control module includes a pressure sensor data comparison module that compares measured pressure volume signal segments to ideal pressure volume segments. A valve actuation hardware remedy module performs a hardware remedy in response to comparing the measured pressure volume signal segments to the ideal pressure volume segments when a valve actuation hardware failure is detected.

  11. Condition monitoring of motor-operated valves in nuclear power plants Pierre Granjon

    E-Print Network [OSTI]

    Boyer, Edmond

    Condition monitoring of motor-operated valves in nuclear power plants Pierre Granjon Gipsa of nuclear power plants. Unfortunately, today's policies present a major drawback. Indeed, these monitoring safety constraints: nuclear power plants. Key components of such systems are motor-operated valves (MOVs

  12. Valve characterization to implement feed-forward control of hydraulically actuated joints

    E-Print Network [OSTI]

    Carey, Abby (Abby M.)

    2008-01-01T23:59:59.000Z

    This thesis characterizes the flow behavior of a Hydraforce SP08-47CL valve given a specific pulse-width modulation (pwm) duty cycle. With a description of valve behavior, a feed-forward term can be implemented in the ...

  13. Modeling the pneumatic relay valve of an s-cam air brake 

    E-Print Network [OSTI]

    Vilayannur Natarajan, Shankar

    2005-08-29T23:59:59.000Z

    by the driver, when there are no faults or defects in the brake system. This thesis is aimed at modeling and experimentally corroborating a subsystem of an air brake system, namely the pneumatic relay valve. The pneumatic relay valve takes a input signal from...

  14. MOTION PLANNING CONTROL OF THE AIRPATH OF AN S.I. ENGINE WITH VALVE

    E-Print Network [OSTI]

    Boyer, Edmond

    MOTION PLANNING CONTROL OF THE AIRPATH OF AN S.I. ENGINE WITH VALVE TIMING ACTUATORS T. Leroy , J, France Abstract: We address the control of the airpath of a turbocharged S.I. engine equipped with Variable Valve Timing actuators (VVT). Compared to standard configurations, the engine does not possess any

  15. Measurement Of The Fluid Flow Load On A Globe Valve Stem Under Various Cavitation

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Measurement Of The Fluid Flow Load On A Globe Valve Stem Under Various Cavitation Conditions)" #12;Measurement Of The Fluid Flow Load On A Globe Valve Stem Under Various Cavitation Conditions, cavitation, fluid flow load, CFD. Abstract: The evaluation of fluid forces on the stem is important for wear

  16. Thermal Shock Effects Modeling on a Globe Valve Body-Bonnet Bolted Flange Joint

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    and are sources of issues to suppliers and users. This is also the case when it comes to valve reliability. In French nuclear industry, EDF used to work closely with valve suppliers to ensure the reliability. Thus of qualification was created in the beginning of the French nuclear Pressurized Water Reactors (PWR) industry

  17. Percutaneous Valve Replacement: Significance of Different Delivery Systems In Vitro and In Vivo

    SciTech Connect (OSTI)

    Attmann, Tim; Lutter, Georg, E-mail: lutter@kielheart.uni-kiel.de; Quaden, Rene [Christian Albrechts University of Kiel, Department of Cardiovascular Surgery, School of Medicine (Germany); Jahnke, Thomas [Christian Albrechts University of Kiel, Department of Radiology, School of Medicine (Germany); Rumberg, Kristin; Cremer, Jochen [Christian Albrechts University of Kiel, Department of Cardiovascular Surgery, School of Medicine (Germany); Muller-Hulsbeck, Stefan [Christian Albrechts University of Kiel, Department of Radiology, School of Medicine (Germany)

    2006-06-15T23:59:59.000Z

    Background and purpose. Percutaneous heart valve replacement is an exciting growing field in cardiovascular medicine yet still with some major problems. Only sophisticated improvement of the instruments could make it a real alternative to conventional surgery. Therefore, the aim of this study was to evaluate different delivery devices for percutaneous heart valve replacement in vitro and in vivo. Methods. A catheter prototype designed by our group, and two commercially available devices for the delivery of esophageal stents and aortic endoprostheses, were tested. After in vitro experiments, an ovine animal model of transfemoral pulmonary valve implantation was established using biological valved self-expanding stents. Only the delivery device for aortic endografts (Medtronic, Talent, Santa Rosa, CA, USA) allowed fast in vitro procedures without material fatigue. This device was chosen for the in vivo tests. Results. Technical success was achieved in 9 of 10 animals (90%). One animal died after perforation of the ventricular wall. Orthotopic pulmonary placement was performed in 6 animals and intentional supravalvular valved stent placement in 3 animals. Conclusions. An adequate in vitro model for this evolving field of interventional heart valve replacement is presented. Furthermore, the present study pinpoints the key characteristics that are mandatory for a delivery system in percutaneous pulmonary valve implantation. With regard to the delivery device's ductility observed during this 'venous' study, an approach to transfemoral aortic valve implantation seems feasible.

  18. Hydraulically actuated fuel injector including a pilot operated spool valve assembly and hydraulic system using same

    DOE Patents [OSTI]

    Shafer, Scott F. (Morton, IL)

    2002-01-01T23:59:59.000Z

    The present invention relates to hydraulic systems including hydraulically actuated fuel injectors that have a pilot operated spool valve assembly. One class of hydraulically actuated fuel injectors includes a solenoid driven pilot valve that controls the initiation of the injection event. However, during cold start conditions, hydraulic fluid, typically engine lubricating oil, is particularly viscous and is often difficult to displace through the relatively small drain path that is defined past the pilot valve member. Because the spool valve typically responds slower than expected during cold start due to the difficulty in displacing the relatively viscous oil, accurate start of injection timing can be difficult to achieve. There also exists a greater difficulty in reaching the higher end of the cold operating speed range. Therefore, the present invention utilizes a fluid evacuation valve to aid in displacement of the relatively viscous oil during cold start conditions.

  19. Optimal Design of a High-Speed On/Off Valve for a Hydraulic Hybrid Vehicle Application

    E-Print Network [OSTI]

    Li, Perry Y.

    Optimal Design of a High-Speed On/Off Valve for a Hydraulic Hybrid Vehicle Application Michael of Minnesota, Minneapolis, MN, USA ABSTRACT Control of hydraulic systems using high-speed on/off valves has been proposed as a way to avoid the inefficiency associated with throttling valves. However, on

  20. Dynamic magnetization states of a spin valve in the presence of dc and ac currents: Synchronization, modification, and chaos

    E-Print Network [OSTI]

    Li, Charles

    Dynamic magnetization states of a spin valve in the presence of dc and ac currents: Synchronization and numerical calculations of dynamic magnetization states of a spin valve in the presence of dc and ac currents are expected to appear. In this paper, we consider a simple spin valve as a model system to study the problem

  1. In situ magnetic a.nd structural analysis of epitaxial NisoFezothin films for spin-valve heterostructures

    E-Print Network [OSTI]

    Atwater, Harry

    In situ magnetic a.nd structural analysis of epitaxial NisoFezothin films for spin-valve-coupling and giant magnetoresistance (.GMRj in NiseFez,,/Cu multilayers' and spin-valves.' To date, all" Furthermore, FeMn, which is typically used in spin valves to exchange bias one of the ferromagnetic layers

  2. Event based Kalman filter observer for rotary high speed on/off valve Meng Wang, Perry Y. Li

    E-Print Network [OSTI]

    Li, Perry Y.

    Event based Kalman filter observer for rotary high speed on/off valve Meng Wang, Perry Y. Li ERC, pli}@me.umn.edu Abstract-- A novel hydraulic rotary self-spinning high speed on/off valve is being- width-modulation (PWM). The valve is designed to operate at a spool frequency of 20Hz to 40Hz. A coarse

  3. Interdiffusion in CoFeCu multilayers and its application to spin-valve structures for data storage

    E-Print Network [OSTI]

    Laughlin, David E.

    Interdiffusion in CoFeÕCu multilayers and its application to spin-valve structures for data storage, Pennsylvania 15213-3890 Received 13 February 2003; accepted 30 April 2003 Spin-valve structures might, the interdiffusion coefficients for all layers in the spin valve have to be determined. For diffusion driven

  4. JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 9, NO. 3, SEPTEMBER 2000 295 An Integrated Liquid Mixer/Valve

    E-Print Network [OSTI]

    Voldman, Joel

    Mixer/Valve Joel Voldman, Student Member, IEEE, Martha L. Gray, Member, IEEE, and Martin A. Schmidt, Member, IEEE Abstract--We present an integrated liquid mixer/valve to be used for sample preparation for bioscience analysis systems. The mixer/valve is a glass-silicon bonded structure with a wafer

  5. Temperature Evolution of Spin-Polarized Electron Tunneling in Silicon NanowirePermalloy Lateral Spin Valve System

    E-Print Network [OSTI]

    Otani, Yoshichika

    Spin Valve System Jean Tarun1;2 , Shaoyun Huang1Ã , Yasuhiro Fukuma1 , Hiroshi Idzuchi1;5 , Yoshi, 2012; accepted February 22, 2012; published online March 16, 2012 A huge nonlocal spin valve signal over 700 has been observed in silicon-nanowire-based lateral spin valve with permalloy electrodes

  6. Thermodynamics -2 Two insulated rigid tanks are connected with a valve. The surroundings are at a constant temperature

    E-Print Network [OSTI]

    Virginia Tech

    Thermodynamics - 2 Two insulated rigid tanks are connected with a valve. The surroundings and is initially evacuated. The valve connecting the tanks is initially closed. Then, the insulation is removed from the tanks, the valve is opened, air is allowed to flow from tank A to tank B until the pressure

  7. Study about the flashing process through a metering expansion valve Mohammed Ait Bahajji, Jose M. Corberan *, Javier Urchueguia,

    E-Print Network [OSTI]

    Fernández de Córdoba, Pedro

    Study about the flashing process through a metering expansion valve Mohammed Ait Bahajji, Jose´ M- sion valve, are presented and discussed. The results involved the measurement at different lifts of the flow-rate flowing through the valve for three different refrigerants R22, R290 (propane) and R410A

  8. Automatic Systole-Diastole Classification of Mitral Valve Complex from RT-3D Echocardiography based on Multiresolution Processing

    E-Print Network [OSTI]

    Wong, Kenneth K.Y.

    Automatic Systole-Diastole Classification of Mitral Valve Complex from RT-3D Echocardiography based, The Chinese University of Hong Kong, Hong Kong ABSTRACT Mitral valve repair is one of the most prevalent operations for various mitral valve conditions. Echocardiography, being famous for its low-cost, non

  9. Intraoperative Tracking of Aortic Valve Plane* DLH Nguyen, M Garreau, V Auffret, H Le Breton, JP Verhoye, P Haigron

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Intraoperative Tracking of Aortic Valve Plane* DLH Nguyen, M Garreau, V Auffret, H Le Breton, JP Verhoye, P Haigron Abstract--The main objective of this work is to track the aortic valve plane in intra-operative fluoroscopic images in order to optimize and secure Transcatheter Aortic Valve Implantation (TAVI) procedure

  10. 1302. P6.51. Using Real-Time Three-Dimensional Ultrasound To Characterize Mitral Valve Motion , M. LINGURARU

    E-Print Network [OSTI]

    1302. P6.51. Using Real-Time Three-Dimensional Ultrasound To Characterize Mitral Valve Motion P results aim to fully characterize the four-dimensional (3D + time) movement of the mitral valve for better understanding of its behavior prior to surgical interventions, such as mitral valve repair. A behavior model

  11. Bmp2 instructs cardiac progenitors to form the heart-valve-inducing field Jos Rivera-Feliciano, Clifford J. Tabin

    E-Print Network [OSTI]

    Tabin, Cliff

    Bmp2 instructs cardiac progenitors to form the heart-valve-inducing field José Rivera Abstract A hallmark of heart-valve development is the swelling and deposition of extracellular matrix in the heart-valve region. Only myocardium overlying this region can signal to underlying endothelium and cause

  12. Mass-Spring Model for Simulation of Heart Valve Tissue Mechanical Behavior Peter E. Hammer1,2,4,*

    E-Print Network [OSTI]

    1 Mass-Spring Model for Simulation of Heart Valve Tissue Mechanical Behavior Peter E. Hammer1, Cambridge, MA Abbreviated title: Mass-Spring Model for Simulation of Heart Valve Tissue * Address, MA, USA. E-mail address: peter.hammer@childrens.harvard.edu. #12;2 Abstract Heart valves

  13. Summary -Procedure For Shutting Off The Oxygen Zone Valve 1. Implement RACE Call the Emergency Operator at 4-2012.

    E-Print Network [OSTI]

    Acton, Scott

    Summary - Procedure For Shutting Off The Oxygen Zone Valve 1. Implement RACE ­ Call the Emergency-cylinders for low oxygen needs and bag ventilated patients using E-cylinders. 4. Identify oxygen zone valve for the affected rooms/areas. 5. Turn off the flow of oxygen at the zone valve if the oxygen cannot be turned off

  14. Percutaneous Transcatheter One-Step Mechanical Aortic Disc Valve Prosthesis Implantation: A Preliminary Feasibility Study in Swine

    SciTech Connect (OSTI)

    Sochman, Jan [Institute for Clinical and Experimental Medicine, Intensive Care Unit, Clinic of Cardiology (Czech Republic)], E-mail: jan.sochman@medicon.cz; Peregrin, Jan H.; Rocek, Miloslav [Institute for Clinical and Experimental Medicine, Department of Diagnostic and Interventional Radiology (Czech Republic); Timmermans, Hans A.; Pavcnik, Dusan; Roesch, Josef [Oregon Health and Sciences University, Dotter Interventional Institute (United States)

    2006-02-15T23:59:59.000Z

    Purpose. To evaluate the feasibility of one-step implantation of a new type of stent-based mechanical aortic disc valve prosthesis (MADVP) above and across the native aortic valve and its short-term function in swine with both functional and dysfunctional native valves. Methods. The MADVP consisted of a folding disc valve made of silicone elastomer attached to either a nitinol Z-stent (Z model) or a nitinol cross-braided stent (SX model). Implantation of 10 MADVPs (6 Z and 4 SX models) was attempted in 10 swine: 4 (2 Z and 2 SX models) with a functional native valve and 6 (4 Z and 2 SX models) with aortic regurgitation induced either by intentional valve injury or by MADVP placement across the native valve. MADVP function was observed for up to 3 hr after implantation. Results. MADVP implantation was successful in 9 swine. One animal died of induced massive regurgitation prior to implantation. Four MADVPs implanted above functioning native valves exhibited good function. In 5 swine with regurgitation, MADVP implantation corrected the induced native valve dysfunction and the device's continuous good function was observed in 4 animals. One MADVP (SX model) placed across native valve gradually migrated into the left ventricle. Conclusion. The tested MADVP can be implanted above and across the native valve in a one-step procedure and can replace the function of the regurgitating native valve. Further technical development and testing are warranted, preferably with a manufactured MADVP.

  15. Flow Characteristics Analysis of Widows' Creek Type Control Valve for Steam Turbine Control

    SciTech Connect (OSTI)

    Yoo, Yong H.; Sohn, Myoung S.; Suh, Kune Y. [PHILOSOPHIA, Inc., Seoul National University, San 56-1 Sillim-dong, Gwanak-gu, Seoul, 151-742 (Korea, Republic of)

    2006-07-01T23:59:59.000Z

    The steam turbine converts the kinetic energy of steam to mechanical energy of rotor blades in the power conversion system of fossil and nuclear power plants. The electric output from the generator of which the rotor is coupled with that of the steam turbine depends on the rotation velocity of the steam turbine bucket. The rotation velocity is proportional to the mass flow rate of steam entering the steam turbine through valves and nozzles. Thus, it is very important to control the steam mass flow rate for the load following operation of power plants. Among various valves that control the steam turbine, the control valve is most significant. The steam flow rate is determined by the area formed by the stem disk and the seat of the control valve. While the ideal control valve linearly controls the steam mass flow rate with its stem lift, the real control valve has various flow characteristic curves pursuant to the stem lift type. Thus, flow characteristic curves are needed to precisely design the control valves manufactured for the operating conditions of nuclear power plants. OMEGA (Optimized Multidimensional Experiment Geometric Apparatus) was built to experimentally study the flow characteristics of steam flowing inside the control valve. The Widows' Creek type control valve was selected for reference. Air was selected as the working fluid in the OMEGA loop to exclude the condensation effect in this simplified approach. Flow characteristic curves were plotted by calculating the ratio of the measured mass flow rate versus the theoretical mass flow rate of the air. The flow characteristic curves are expected to be utilized to accurately design and operate the control valve for fossil as well as nuclear plants. (authors)

  16. Spin transfer switching in current-perpendicular-to-plane spin valve observed by magneto-optical Kerr effect using visible light

    E-Print Network [OSTI]

    Otani, Yoshichika

    Spin transfer switching in current-perpendicular-to-plane spin valve observed by magneto-perpendicular-to-plane spin-valve device. The device consists of three spin-valve elements, each of which comprises-perpendicular-to- plane CPP spin-valve device has been directly observed by using a time resolved x-ray microscopy7 while

  17. Performance characteristics of a turbo expander substituted for expansion valve on air-conditioner

    SciTech Connect (OSTI)

    Cho, Soo-Yong [Department of Mechanical and Aerospace Engineering (ReCAPT), Gyeongsang National University, 900 Gajoa-dong, Jinju 660-701 (Korea); Cho, Chong-Hyun [School of Mechanical and Aerospace Engineering, Gyeongsang National University, 900 Gajoa-dong, Jinju 660-701 (Korea); Kim, Chaesil [Department of Mechanical Engineering, Changwon National University, 9 Sarim-dong, Changwon 641-773 (Korea)

    2008-09-15T23:59:59.000Z

    An experimental study is conducted on a small turbo expander which could be applied to the expansion process in place of expansion valves in refrigerator or air-conditioner to improve the cycle efficiency by recovering energy from the throttling process. The operating gas is HFC134a and the maximum cooling capacity of experiment apparatus is 32.7 kW. Four different turbo expanders are tested to find the performance characteristics of the turbo expander when they operate at a low partial admission rate. The partial admission rate is 1.70% or 2.37, and expanders are operated in the supersonic flow. In the experiment, pressure and temperature are measured at 10 different locations in the experimental apparatus. In addition to these measurements, output power at the turbo expander is measured through a generator installed on a rotor shaft with the rotational speed. Performance data of the turbo expander are obtained at many part load operations by adjusting the output power of the generator. A maximum of 15.8% total-to-static efficiency is obtained when the pressure ratio and the partial admission ratio are 2.37 and 1.70%, respectively. Experimental results show that the optimal velocity ratio decreases when the pressure ratio is decreased, and peak efficiencies, which are obtained at locally maximized efficiency depending on the operating condition, vary linearly against the subcooling temperature or the pressure ratio. (author)

  18. Jet-controlled freeze valve for use in a glass melter

    DOE Patents [OSTI]

    Routt, K.R.

    1985-07-29T23:59:59.000Z

    A drain valve for use in furnace for the melting of thermoplastic material is disclosed. The furnace includes a drain cavity formed in its bottom for withdrawing a flow of thermoplastic material. The drain valve includes a flow member which include a flow tube having an inlet and outlet for the material, and coaxially disposed concentric tubular members defining annuli surrounding the flow tube. The tubular members include heating and cooling means for the flow tube. The drain valve can also be used in a furnace of glass melting that includes a drain cavity for withdrawing molten glass from the furnace.

  19. ANALYSIS OF SAFETY RELIEF VALVE PROOF TEST DATA TO OPTIMIZE LIFECYCLE MAINTENANCE COSTS

    SciTech Connect (OSTI)

    Gross, Robert; Harris, Stephen

    2007-08-01T23:59:59.000Z

    Proof test results were analyzed and compared with a proposed life cycle curve or hazard function and the limit of useful life. Relief valve proof testing procedures, statistical modeling, data collection processes, and time-in-service trends are presented. The resulting analysis of test data allows for the estimation of the PFD. Extended maintenance intervals to the limit of useful life as well as methodologies and practices for improving relief valve performance and reliability are discussed. A generic cost-benefit analysis and an expected life cycle cost reduction concludes that $90 million maintenance dollars might be avoided for a population of 3000 valves over 20 years.

  20. Strength and fatigue of NT551 silicon nitride and NT551 diesel exhaust valves

    SciTech Connect (OSTI)

    Andrews, M.J.; Werezczak, A.A.; Kirkland, T.P.; Breder, K.

    2000-02-01T23:59:59.000Z

    The content of this report is excerpted from Mark Andrew's Ph.D. Thesis (Andrews, 1999), which was funded by a DOE/OTT High Temperature Materials Laboratory Graduate Fellowship. It involves the characterization of NT551 and valves fabricated with it. The motivations behind using silicon nitride (Si{sub 3}N{sub 4}) as an exhaust valve for a diesel engine are presented in this section. There are several economic factors that have encouraged the design and implementation of ceramic components for internal combustion (IC) engines. The reasons for selecting the diesel engine valve for this are also presented.

  1. Proceedings of the symposium on inservice testing of pumps and valves

    SciTech Connect (OSTI)

    Not Available

    1990-10-01T23:59:59.000Z

    The 1990 Symposium on Inservice Testing of Pumps and Valves, jointly sponsored by the Board on Nuclear Codes and Standards of the American Society of Mechanical Engineers and by the Nuclear Regulatory Commission, provided a forum for the discussion of current programs and methods for inservice testing at nuclear power plants. The symposium also provided an opportunity to discuss the need to improve inservice testing in order to ensure the reliable performance of pumps and valves. The participation of industry representatives, regulators, and consultants resulted in the discussion of a broad spectrum of ideas and perspectives regarding the improvement of inservice testing of pumps and valves at nuclear power plants.

  2. Variable valve timing in a homogenous charge compression ignition engine

    DOE Patents [OSTI]

    Lawrence, Keith E.; Faletti, James J.; Funke, Steven J.; Maloney, Ronald P.

    2004-08-03T23:59:59.000Z

    The present invention relates generally to the field of homogenous charge compression ignition engines, in which fuel is injected when the cylinder piston is relatively close to the bottom dead center position for its compression stroke. The fuel mixes with air in the cylinder during the compression stroke to create a relatively lean homogeneous mixture that preferably ignites when the piston is relatively close to the top dead center position. However, if the ignition event occurs either earlier or later than desired, lowered performance, engine misfire, or even engine damage, can result. The present invention utilizes internal exhaust gas recirculation and/or compression ratio control to control the timing of ignition events and combustion duration in homogeneous charge compression ignition engines. Thus, at least one electro-hydraulic assist actuator is provided that is capable of mechanically engaging at least one cam actuated intake and/or exhaust valve.

  3. Configuration and temperature dependence of magnetic damping in spin valves

    SciTech Connect (OSTI)

    Joyeux, X.; Devolder, T.; Kim, Joo-Von; Gomez de la Torre, Y.; Eimer, S.; Chappert, C. [Institut d'Electronique Fondamentale, University Paris-Sud, 91405 Orsay (France); UMR8622, CNRS, University Paris-Sud, 91405 Orsay (France)

    2011-09-15T23:59:59.000Z

    Using vector-analyzer ferromagnetic resonance, we have studied the microwave susceptibility of a Py/Co/Cu/Co/MnIr spin valve over a large temperature range (5-450 K) and as a function of the magnetic configuration. An effective magnetization and Gilbert damping constant of 1.1 T and 0.021, respectively, are found for the permalloy free layer, with no discernible variation in temperature observed for either quantities. In contrast, the pinned layer magnetization is reduced by heating, and the exchange bias collapses near a temperature of 450 K. The ferromagnetic resonance linewidth of the free layer increases by 500 MHz when the layer magnetizations are aligned in antiparallel, which is attributed to a configuration-dependent contribution to the damping from spin pumping effects.

  4. Flexible semi-transparent organic spin valve based on bathocuproine

    SciTech Connect (OSTI)

    Sun, Xiangnan; Bedoya-Pinto, Amilcar; Llopis, Roger [CIC nanoGUNE, Tolosa Hiribidea 76, 20018 Donostia San Sebastian (Spain); Casanova, Fèlix; Hueso, Luis E., E-mail: l.hueso@nanogune.eu [CIC nanoGUNE, Tolosa Hiribidea 76, 20018 Donostia San Sebastian (Spain); IKERBASQUE, Basque Foundation for Science, 48011 Bilbao (Spain)

    2014-08-25T23:59:59.000Z

    Organic semiconductors are attractive materials for advanced spintronic applications due to their long spin lifetimes and, simultaneously, their mechanical flexibility. With the aim of combining these advantages in a single device, we report on the fabrication and properties of a mechanically flexible bathocuproine-based spin valve. This organic spin device shows great stability on both electrical and magneto-transport properties upon mechanical bending at different radius (up to r?=?5?mm), while featuring long-lasting endurance (on bending over 50 times). The room-temperature magnetoresistance ratio reaches up to 3.5%, and is notably preserved under air atmosphere. The observation of spin transport at room-temperature, combined with the outstanding mechanical properties and air stability, highlights the potential of bathocuproine-based spin devices towards applications.

  5. Negative Valve Overlap Reforming Chemistry in Low-Oxygen Environments

    SciTech Connect (OSTI)

    Szybist, James P [ORNL] [ORNL; Steeper, Richard R. [Sandia National Laboratories (SNL)] [Sandia National Laboratories (SNL); Splitter, Derek A [ORNL] [ORNL; Kalaskar, Vickey B [ORNL] [ORNL; Pihl, Josh A [ORNL] [ORNL; Daw, C Stuart [ORNL] [ORNL

    2014-01-01T23:59:59.000Z

    Fuel injection into the negative valve overlap (NVO) period is a common method for controlling combustion phasing in homogeneous charge compression ignition (HCCI) and other forms of advanced combustion. When fuel is injected into O2-deficient NVO conditions, a portion of the fuel can be converted to products containing significant levels of H2 and CO. Additionally, other short chain hydrocarbons are produced by means of thermal cracking, water-gas shift, and partial oxidation reactions. The present study experimentally investigates the fuel reforming chemistry that occurs during NVO. To this end, two very different experimental facilities are utilized and their results are compared. One facility is located at Oak Ridge National Laboratory, which uses a custom research engine cycle developed to isolate the NVO event from main combustion, allowing a steady stream of NVO reformate to be exhausted from the engine and chemically analyzed. The other experimental facility, located at Sandia National Laboratories, uses a dump valve to capture the exhaust from a single NVO event for analysis. Results from the two experiments are in excellent trend-wise agreement and indicate that the reforming process under low-O2 conditions produces substantial concentrations of H2, CO, methane, and other short-chain hydrocarbon species. The concentration of these species is found to be strongly dependent on fuel injection timing and injected fuel type, with weaker dependencies on NVO duration and initial temperature, indicating that NVO reforming is kinetically slow. Further, NVO reforming does not require a large energy input from the engine, meaning that it is not thermodynamically expensive. The implications of these results on HCCI and other forms of combustion are discussed in detail.

  6. HOUSING GUARANTEE Apply Online

    E-Print Network [OSTI]

    Mease, Kenneth D.

    THE UCI HOUSING GUARANTEE Apply Online 1 Log in to your MyAdmission account via the tab of Admission fee. 3 Complete the Online Housing Application and pay the $20 non-refundable fee. Freshmen apply for the residence halls. Transfer students apply for Arroyo Vista theme houses and on-campus apartments. Students 25

  7. Model for inventory management in valve manufacturing cell at Waters Corporation

    E-Print Network [OSTI]

    Yao, Bingxin

    2013-01-01T23:59:59.000Z

    This thesis addresses the challenges of improving the on-time delivery performance of a high-volume critical part type in a high-product-mix manufacturing facility of valves. Preliminary analysis on the push-type production ...

  8. Volume 4 Issue 2 www.nasa.gov/centers/stennis February 2009 Stennis tests shuttle valves

    E-Print Network [OSTI]

    hydrogen tubing. The call went out to three centers to begin testing aspects of the valve. Engineers the Stennis team faced during the original construction, or during the crossover to successfully execute

  9. Towards Real-Time and Memory Efficient Predictions of Valve States in Diesel Engines

    E-Print Network [OSTI]

    Zell, Andreas

    Towards Real-Time and Memory Efficient Predictions of Valve States in Diesel Engines Philippe Komma T¨ubingen, Germany {philippe.komma, andreas.zell}@uni-tuebingen.de system for a diesel engine

  10. Granular Attrition due to Rotary Valve in a Pneumatic Conveying System

    E-Print Network [OSTI]

    Yao, Jun

    The rotary valve is a widely used mechanical device in many solids-handling industrial processes. However, it may also be responsible for most of the attrition effects occurring in a typical process. In this study, the ...

  11. Hemodynamic Environments from Opposing Sides of Human Aortic Valve Leaflets Evoke Distinct Endothelial Phenotypes In Vitro

    E-Print Network [OSTI]

    Weinberg, Eli J.

    The regulation of valvular endothelial phenotypes by the hemodynamic environments of the human aortic valve is poorly understood. The nodular lesions of calcific aortic stenosis (CAS) develop predominantly beneath the ...

  12. Percutaneous aortic valve replacement in a re-animated postmortem heart

    E-Print Network [OSTI]

    White, Jennifer; Sun, Amy; Killien, Lauren; Evangelista, Dennis

    2006-01-01T23:59:59.000Z

    transcatheter implantation of heart valve prosthesis for thein apex of post-mortem heart (lower view). B C A Figure 5A.descending aorta in lambs. Eur Heart J. 2002;23:1045-49. 5.

  13. VALVE FUNNEL SPRING PIN PRESS PERFORMANCE AND FUNCTIONAL REQUIREMENTS EVALUATION FOR SPECIAL TOOLS AND EQUIPMENT

    SciTech Connect (OSTI)

    WITHERSPOON JT

    2009-12-30T23:59:59.000Z

    This evaluation allows use of the valve funnel spring pin press and describes appropriate handling instructions for the tool. The engineering evaluation is required for operations and field use of special tools and equipment.

  14. Purchasing Water-Efficient Faucets, Pre-Rinse Spray Valves, Showerheads, Toilets, and Urinals

    Broader source: Energy.gov [DOE]

    Federal agencies are required to purchase U.S. Environmental Protection Agency (EPA) WaterSense-labeled products where applicable. Faucets, pre-rinse spray valves, showerheads, toilets, and urinals are covered under the WaterSense program.

  15. Rankine cycle condenser pressure control using an energy conversion device bypass valve

    DOE Patents [OSTI]

    Ernst, Timothy C; Nelson, Christopher R; Zigan, James A

    2014-04-01T23:59:59.000Z

    The disclosure provides a waste heat recovery system and method in which pressure in a Rankine cycle (RC) system of the WHR system is regulated by diverting working fluid from entering an inlet of an energy conversion device of the RC system. In the system, an inlet of a controllable bypass valve is fluidly coupled to a working fluid path upstream of an energy conversion device of the RC system, and an outlet of the bypass valve is fluidly coupled to the working fluid path upstream of the condenser of the RC system such that working fluid passing through the bypass valve bypasses the energy conversion device and increases the pressure in a condenser. A controller determines the temperature and pressure of the working fluid and controls the bypass valve to regulate pressure in the condenser.

  16. Risk assessment of drain valve failure in the K-West basin south loadout pit

    SciTech Connect (OSTI)

    MORGAN, R.G.

    1999-06-23T23:59:59.000Z

    The drain valve located in the bottom of the K-West Basin South Loadout Pit (SLOP) could provide an additional leak path from the K Basins if the drain valve were damaged during construction, installation, or operation of the cask loading system. For the K-West Basin SLOP the immersion pail support structure (IPSS) has already been installed, but the immersion pail has not been installed in the IPSS. The objective of this analysis is to evaluate the risk of damaging the drain valve during the remaining installation activities or operation of the cask loading system. Valve damage, as used in this analysis, does not necessarily imply large amounts of the water will be released quickly from the basin, rather valve damage implies that the valve's integrity has been compromised. The analysis process is a risk-based uncertainty analysis where best engineering judgement is used to represent each variable in the analysis. The uncertainty associated with each variable is represented by a probability distribution. The uncertainty is propagated through the analysis by Monte Carlo convolution techniques. The corresponding results are developed as a probability distribution and the risk is expressed in terms of the corresponding complementary cumulative distribution function (''risk curve''). The total risk is the area under the ''risk curve''. The risk of potentially dropping a cask into or on the IPSS and damaging the drain valve is approximately 1 x 10{sup -4} to 2 x 10{sup -5} per year. The risk of objects falling behind the IPSS and damaging the valve is 3 x 10{sup -2} to 6 x 10{sup -3} per year. Both risks are expressed as drain value failure frequencies. The risk of objects falling behind the IPSS and damaging the valve can be significantly reduced by an impact limiter and/or installing a gating or plate over the area bounded by the back of the IPSS and the wall of the SLOP. With either of these actions there is a 90 percent confidence that the frequency of drain valve failure would be less than 1 x 10{sup -6} per year.

  17. Applied Computer Science

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Science and Innovation Computing CCS Division CCS-7 Applied Computer Science Innovative co-design of applications, algorithms, and architectures in order to enable...

  18. Apply early! Limited enrollment.

    E-Print Network [OSTI]

    volcano. Experience the culture and history of Hawaii, and the impact of human activitiesApply early! Limited enrollment. Environmental Science in the Hawaiian Islands Observe, research

  19. Selecting and Applying Interfacings

    E-Print Network [OSTI]

    2006-05-01T23:59:59.000Z

    Selecting and using interfacing correctly is an important component of garment construction. The various types of interfacing are described and methods of applying them are discussed in detail....

  20. Spin-dependent transport in a nanopillar non-local spin valve J.-B. Laloe a,, T. Yang a

    E-Print Network [OSTI]

    Otani, Yoshichika

    Spin-dependent transport in a nanopillar non-local spin valve J.-B. Lalo¨e a,Ã, T. Yang a , T: Lateral spin-valve Spin current a b s t r a c t We investigate the injection of a pure spin current into a non-magnetic Cu wire in a lateral spin valve. We detect the spin accumulation occurring

  1. Modelling current-induced magnetization switching in Heusler alloy Co2FeAl-based spin-valve nanopillar

    E-Print Network [OSTI]

    Chen, Long-Qing

    Modelling current-induced magnetization switching in Heusler alloy Co2FeAl-based spin-valve-perpendicular-to-plane pseudo spin-valves using Co2Fe(Ga0.5Ge0.5) Heusler alloy Appl. Phys. Lett. 103, 202401 (2013); 10.1063/1.4829633 Simulation of multilevel cell spin transfer switching in a full-Heusler alloy spin-valve nanopillar Appl

  2. Simulation of multilevel cell spin transfer switching in a full-Heusler alloy spin-valve nanopillar

    E-Print Network [OSTI]

    Chen, Long-Qing

    Simulation of multilevel cell spin transfer switching in a full-Heusler alloy spin-valve nanopillar of multilevel cell spin transfer switching in a full-Heusler alloy spin-valve nanopillar H. B. Huang,1,2 X. Q in a full-Heusler Co2FeAl0.5Si0.5 alloy spin-valve nanopillar was investigated using micromagnetic

  3. Acceptance test report for the AN valve pit leak detection and low point drain assembly mock up test procedure

    SciTech Connect (OSTI)

    EWER, K.L.

    1999-07-20T23:59:59.000Z

    This document describes The Performance Mock-up Test Procedure for the Valve Pit Leak Detection and Low Point Drain Assembly Performance Mock-Up Test Procedure.

  4. INTRODUCTION APPLIED GEOPHYSICS

    E-Print Network [OSTI]

    Merriam, James

    GEOL 384.3 INTRODUCTION TO APPLIED GEOPHYSICS OUTLINE INTRODUCTION TO APPLIED GEOPHYSICS GEOL 384 unknowns; the ones we don't know we don't know. And if one looks throughout the history of geophysics he didn't really say geophysics. He said, " ... our country and other free countries ...". But I am

  5. Unit commitment with valve-point loading effect

    E-Print Network [OSTI]

    2014-04-18T23:59:59.000Z

    Apr 18, 2014 ... function, which is modeled with great detail on power regions being used in ... applied to a related problem: that of optimizing short-term hydro ...

  6. SU-C-18C-02: Specifcation of X-Ray Projection Angles Which Are Aligned with the Aortic Valve Plane From a Planar Image of a Valvuloplasty Balloon Inflated Across the Aortic Valve

    SciTech Connect (OSTI)

    Fetterly, K; Mathew, V [Mayo Clinic, Rochester, MN (United States)

    2014-06-01T23:59:59.000Z

    Purpose: Transcatheter aortic valve replacement (TAVR) procedures provide a method to implant a prosthetic aortic valve via a minimallyinvasive, catheter-based procedure. TAVR procedures require use of interventional fluoroscopy c-arm projection angles which are aligned with the aortic valve plane to minimize prosthetic valve positioning error due to x-ray imaging parallax. The purpose of this work is to calculate the continuous range of interventional fluoroscopy c-arm projection angles which are aligned with the aortic valve plane from a single planar image of a valvuloplasty balloon inflated across the aortic valve. Methods: Computational methods to measure the 3D angular orientation of the aortic valve were developed. Required inputs include a planar x-ray image of a known valvuloplasty balloon inflated across the aortic valve and specifications of x-ray imaging geometry from the DICOM header of the image. A-priori knowledge of the species-specific typical range of aortic orientation is required to specify the sign of the angle of the long axis of the balloon with respect to the x-ray beam. The methods were validated ex-vivo and in a live pig. Results: Ex-vivo experiments demonstrated that the angular orientation of a stationary inflated valvuloplasty balloon can be measured with precision less than 1 degree. In-vivo pig experiments demonstrated that cardiac motion contributed to measurement variability, with precision less than 3 degrees. Error in specification of x-ray geometry directly influences measurement accuracy. Conclusion: This work demonstrates that the 3D angular orientation of the aortic valve can be calculated precisely from a planar image of a valvuloplasty balloon inflated across the aortic valve and known x-ray geometry. This method could be used to determine appropriate c-arm angular projections during TAVR procedures to minimize x-ray imaging parallax and thereby minimize prosthetic valve positioning errors.

  7. Heart valve cardiomyocytes of mouse embryos express the serotonin transporter SERT

    SciTech Connect (OSTI)

    Pavone, Luigi Michele [Department of Biological Structures, Functions and Technologies, University of Naples Federico II, Via F. Delpino 1, 80137 Naples (Italy); Department of Biochemistry and Medical Biotechnologies, University of Naples Federico II, Naples (Italy)], E-mail: pavone@dbbm.unina.it; Spina, Anna; Lo Muto, Roberta; Santoro, Dionea [Department of Biological Structures, Functions and Technologies, University of Naples Federico II, Via F. Delpino 1, 80137 Naples (Italy); Department of Biochemistry and Medical Biotechnologies, University of Naples Federico II, Naples (Italy); Mastellone, Vincenzo [Department of Experimental Medicine 'G. Salvatore', University of Magna Graecia, Catanzaro (Italy); Avallone, Luigi [Department of Biological Structures, Functions and Technologies, University of Naples Federico II, Via F. Delpino 1, 80137 Naples (Italy)

    2008-12-12T23:59:59.000Z

    Multiple evidence demonstrate a role for serotonin and its transporter SERT in heart valve development and disease. By utilizing a Cre/loxP system driven by SERT gene expression, we recently demonstrated a regionally restricted distribution of SERT-expressing cells in developing mouse heart. In order to characterize the cell types exhibiting SERT expression within the mouse heart valves at early developmental stages, in this study we performed immunohistochemistry for Islet1 (Isl1) and connexin-43 (Cx-43) on heart sections from SERT{sup Cre/+};ROSA26R embryos previously stained with X-gal. We observed the co-localization of LacZ staining with Isl1 labelling in the outflow tract, the right ventricle and the conal region of E11.5 mouse heart. Cx-43 labelled cells co-localized with LacZ stained cells in the forming atrioventricular valves. These results demonstrate the cardiomyocyte phenotype of SERT-expressing cells in heart valves of the developing mouse heart, thus suggesting an active role of SERT in early heart valve development.

  8. Uncertainty Analysis for a Virtual Flow Meter Using an Air-Handling Unit Chilled Water Valve

    SciTech Connect (OSTI)

    Song, Li; Wang, Gang; Brambley, Michael R.

    2013-04-28T23:59:59.000Z

    A virtual water flow meter is developed that uses the chilled water control valve on an air-handling unit as a measurement device. The flow rate of water through the valve is calculated using the differential pressure across the valve and its associated coil, the valve command, and an empirically determined valve characteristic curve. Thus, the probability of error in the measurements is significantly greater than for conventionally manufactured flow meters. In this paper, mathematical models are developed and used to conduct uncertainty analysis for the virtual flow meter, and the results from the virtual meter are compared to measurements made with an ultrasonic flow meter. Theoretical uncertainty analysis shows that the total uncertainty in flow rates from the virtual flow meter is 1.46% with 95% confidence; comparison of virtual flow meter results with measurements from an ultrasonic flow meter yielded anuncertainty of 1.46% with 99% confidence. The comparable results from the theoretical uncertainty analysis and empirical comparison with the ultrasonic flow meter corroborate each other, and tend to validate the approach to computationally estimating uncertainty for virtual sensors introduced in this study.

  9. Analysis of Flow in Pilot Operated Safety and Relief Valve of Nuclear Reactor Coolant System

    SciTech Connect (OSTI)

    Kwon, Soon-Bum; Lee, Dong-Won [Department of Mechanical Engineering, Kyungpook National University, 1370, Sankyuk-dong, Daegu 702-701 (Korea, Republic of); Kim, In-Goo; Ahn, Hyung-Joon; Kim, Hho-Jung [Korea Institute of Nuclear Safety, 19, Kusungdong, Yousungku, Daejon 305-338 (Korea, Republic of)

    2004-07-01T23:59:59.000Z

    When the POSRV equipped in a nuclear power plant opens in instant by a failure in coolant system of PWR, a moving shock wave generates, and propagates downstream of the valve, inducing a complicated unsteadiness. The moving shock wave may exert severe load to the structure. In this connection, a method of gradual opening of the valve is used to reduce the load acting on the wall at the downstream of the POSRV. In the present study, experiments and calculations are performed to investigate the detail unsteady flow at the various pipe units and the effect of valve opening time on the flow downstream of the valve. In calculation by using of air as working fluid, 2-dimensional, unsteady compressible Navier-Stokes equations are solved by finite volume method. It was found that when the incident shock wave passes through the pipe unit, it may experience diffraction, reflection and interaction with a vortex. Furthermore, the geometry of the pipe unit affects the reflection type of shock wave and changes the load acting on the wall of pipe unit. It was also turned out that the maximum force acting on the wall of the pipe unit becomes in order of T-junction, 108 deg. elbow and branch in magnitude, respectively. And, the results obtained that show that the rapid pressure rise due to the moving shock wave by instant POSRV valve opening is attenuated by employing the gradual opening. (authors)

  10. Essays in applied microeconomics

    E-Print Network [OSTI]

    Aron-Dine, Aviva

    2012-01-01T23:59:59.000Z

    This dissertation consists of three chapters on topics in applied microeconomics. In the first chapter. I investigate whether voters are more likely to support additional spending on local public services when they perceive ...

  11. Engineering and Applied

    E-Print Network [OSTI]

    Stowell, Michael

    > Computer Science > Electrical, Computer, and Energy Engineering > Mechanical Engineering 11, Computational Science and Engineering, Energy Systems and Environmental Sustainability, Materials ScienceCollege of Engineering and Applied Science Contact Robert H. Davis, Engineering Dean 303

  12. Applying for Research Awards

    E-Print Network [OSTI]

    ... 53.22 KB APPLYING FOR RESEARCH AWARDS The Eastern Bird Banding Association seeks applicants for its annual $500 research awards in aid of research using banding techniques or bird banding data. ...

  13. In this research project I will design and build a demo model of Professor Sun's patented camless valve actuator device. Modern internal combustion engines rely on valves in each

    E-Print Network [OSTI]

    Minnesota, University of

    valve actuator device. Modern internal combustion engines rely on valves in each cylinder to open, they can be programmed to allow much more efficiency in the combustion cycle at any engine speed, with any the engine and instead replaces it with electronic actuators that can be precisely controlled by the onboard

  14. Thermal Shock Effects Modeling On A Globe Valve Body-Bonnet Bolted Flange Joint

    E-Print Network [OSTI]

    Mathieu, Jean-Philippe; Ferrari, Jerome; Hersant, David

    2012-01-01T23:59:59.000Z

    This paper attends to show efforts made at EDF R&D to improve comprehension of valve parts loadings during operation. Thermal shock in a globe valve is represented and modeled using EDF R&D Finite Element Analysis code (Code_Aster). Choices of modeling are discussed and balanced on the basis of "what an engineer can obtain without becoming a researcher". First simulation results are presented. Attention is focused on the evolution of Body-Bonnet Bolted Flange Joint (BBBFJ) tightening forces which are simulated during the thermal shock. An experimental setup is also presented for the studied valve, which implies thermocouple implementation for comparison of the simulated thermal field and strain measurement on each threaded rod to validate the mechanical modeling.

  15. Scoping Study on the Safety Impact of Valve Spacing in Natural Gas Pipelines

    SciTech Connect (OSTI)

    Sulfredge, Charles David [ORNL

    2007-07-01T23:59:59.000Z

    The U.S. Department of Transportation's Pipeline and Hazardous Materials Safety Administration (PHMSA) is responsible for ensuring the safe, reliable, and environmentally sound operation of the nation's natural gas and hazardous liquid pipelines. Regulations adopted by PHMSA for gas pipelines are provided in 49 CFR 192, and spacing requirements for valves in gas transmission pipelines are presented in 49 CFR 192.179. The present report describes the findings of a scoping study conducted by Oak Ridge National Laboratory (ORNL) to assist PHMSA in assessing the safety impact of system valve spacing. Calculations of the pressures, temperatures, and flow velocities during a set of representative pipe depressurization transients were carried out using a one-dimensional numerical model with either ideal gas or real gas properties for the fluid. With both ideal gas and real gas properties, the high-consequence area radius for any resulting fire as defined by Stevens in GRI-00/0189 was evaluated as one measure of the pipeline safety. In the real gas case, a model for convective heat transfer from the pipe wall is included to assess the potential for shut-off valve failures due to excessively low temperatures resulting from depressurization cooling of the pipe. A discussion is also provided of some additional factors by which system valve spacing could affect overall pipeline safety. The following conclusions can be drawn from this work: (1) Using an adaptation of the Stephens hazard radius criteria, valve spacing has a negligible influence on natural gas pipeline safety for the pipeline diameter, pressure range, and valve spacings considered in this study. (2) Over the first 30 s of the transient, pipeline pressure has a far greater effect on the hazard radius calculated with the Stephens criteria than any variations in the transient flow decay profile and the average discharge rate. (3) Other factors besides the Stephens criteria, such as the longer burn time for an accidental fire, greater period of danger to emergency personnel, increased unavoidable loss of gas, and possible depressurization cooling of the shut-off valves may also be important when deciding whether a change in the required valve spacing would be beneficial from a safety standpoint. (4) The average normalized discharge rate of {lambda}{sub avg} = 0.33 assumed by Stephens in developing his safety criteria is an excellent conservative value for natural gas discharge at the pressures, valve spacings, and pipe diameter used in this study. This conclusion remains valid even when real rather than ideal gas properties are considered in the analysis. (5) Significant pipe wall cooling effects (T{sub w} < -50 F or 228 K) can extend for a mile or more upstream from the rupture point within 30 s of a break. These conditions are colder than the temperature range specifications for many valve lubricants. The length of the low-temperature zone due to this cooling effect is also essentially independent of the system shut-off valve spacing or the distance between the break and a compressor station. (6) Having more redundant shut-off valves available would reduce the probability that pipe cooling effects could interfere with isolating the broken area following a pipeline rupture accident.

  16. "Non-Reflective" Boundary Design via Remote Sensing and PID Control Valve

    SciTech Connect (OSTI)

    Zhang, Qin Fen [ORNL] [ORNL; Karney, Professor Byran W. [University of Toronto, Canada] [University of Toronto, Canada; Pejovic, Dr. Stanislav [University of Toronto, Canada] [University of Toronto, Canada

    2011-01-01T23:59:59.000Z

    This paper develops the concept of a nonreflective (or semireflective) boundary condition using the combination of a remote sensor and a control system to modulate a relief valve. The essential idea is to sense the pressure change at a remote location and then to use the measured data to adjust the opening of an active control valve at the end of the line to eliminate or attenuate the wave reflections at the valve, thus controlling system transient pressures. This novel idea is shown here through numerical simulation to have considerable potential for transient protection. Using this model, wave reflections and resonance can be effectively eliminated for frictionless pipelines or initial no-flow conditions and can be better controlled in more realistic pipelines for a range of transient disturbances. In addition, the features of even-order harmonics and nonreflective boundary conditions during steady oscillation, obtained through time domain transient analysis, are verified by hydraulic impedance analysis in the frequency domain.

  17. Bypass valve and coolant flow controls for optimum temperatures in waste heat recovery systems

    DOE Patents [OSTI]

    Meisner, Gregory P

    2013-10-08T23:59:59.000Z

    Implementing an optimized waste heat recovery system includes calculating a temperature and a rate of change in temperature of a heat exchanger of a waste heat recovery system, and predicting a temperature and a rate of change in temperature of a material flowing through a channel of the waste heat recovery system. Upon determining the rate of change in the temperature of the material is predicted to be higher than the rate of change in the temperature of the heat exchanger, the optimized waste heat recovery system calculates a valve position and timing for the channel that is configurable for achieving a rate of material flow that is determined to produce and maintain a defined threshold temperature of the heat exchanger, and actuates the valve according to the calculated valve position and calculated timing.

  18. Half-metallic magnetism and the search for better spin valves

    SciTech Connect (OSTI)

    Everschor-Sitte, Karin; Sitte, Matthias; MacDonald, Allan H. [Department of Physics, The University of Texas at Austin, 2515 Speedway, Austin, Texas 78712 (United States)

    2014-08-28T23:59:59.000Z

    We use a previously proposed theory for the temperature dependence of tunneling magnetoresistance to shed light on ongoing efforts to optimize spin valves. First, we show that a mechanism in which spin valve performance at finite temperatures is limited by uncorrelated thermal fluctuations of magnetization orientations on opposite sides of a tunnel junction is in good agreement with recent studies of the temperature-dependent magnetoresistance of high quality tunnel junctions with MgO barriers. Using this insight, we propose a simple formula which captures the advantages for spin-valve optimization of using materials with a high spin polarization of Fermi-level tunneling electrons, and of using materials with high ferromagnetic transition temperatures. We conclude that half-metallic ferromagnets can yield better spin-value performance than current elemental transition metal ferromagnet/MgO systems only if their ferromagnetic transition temperatures exceed ?950?K.

  19. CFD Analysis of a Novel High Speed Rotary On/Off Valve 283 Proc. of 6th

    E-Print Network [OSTI]

    Li, Perry Y.

    section, and outlet turbine. A CFD model is created for each section, and then verified. The equations that predict the valve performance has been validated for the inlet rail with nozzles and the outlet turbine, valve design, throttle-less control 1 INTRODUCTION Hydraulic actuation systems have been widely used due

  20. Risk assessment of K basin twelve-inch drain valve failure from a postulated seismic initiating event

    SciTech Connect (OSTI)

    MORGAN, R.G.

    1999-04-06T23:59:59.000Z

    The Spent Nuclear Fuel (SNF) Project will transfer metallic SNF from the Hanford 105 K-East and 105 K-West Basins to safe interim storage in the Canister Storage Building in the 200 Area. The initial basis for design, fabrication, installation, and operation of the fuel removal systems was that the basin leak rates which could result from a postulated accident condition would not be excessive relative to reasonable recovery operations. However, an additional potential K Basin water leak path is through the K Basin drain valves. Three twelve-inch drain valves are located in the main basin bays along the north wall. The sumps containing the valves are filled with concrete which covers the drain valve body. Visual observations suggest that only the valve's bonnet and stem are exposed above the basin concrete floor. It was recognized, however, that damage of the drain valve bonnet or stem during a seismic initiating event could provide a potential K Basin water leak path. The objectives of this activity are to: (1) evaluate the risk of damaging the three twelve-inch drain valves located along the north wall of the main basin from a seismic initiating event, and (2) determine the associated potential leak rate from a damaged valve.

  1. Characterization of a Micro-Mixing, Pumping, and Valving System Ajay A. Deshmukh, Dorian Liepmann, and Albert P. Pisano

    E-Print Network [OSTI]

    Liepmann, Dorian

    Characterization of a Micro-Mixing, Pumping, and Valving System Ajay A. Deshmukh, Dorian Liepmann the performance of a complete pulsatile-flow, continuous micromixing system which utilizes new technology pumps measurements. Keywords: Mixer, Pump, Valve INTRODUCTION A new MEMS pumping and mixing system has been developed

  2. Information Science, Computing, Applied Math

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Science, Computing, Applied Math science-innovationassetsimagesicon-science.jpg Information Science, Computing, Applied Math National security depends on science and...

  3. Sealing off a carbon nanotube with a self-assembled aqueous valve for the storage of hydrogen in GPa pressure

    E-Print Network [OSTI]

    Chen, H Y; Gong, X G; Liu, Zhi-Feng

    2012-01-01T23:59:59.000Z

    The end section of a carbon nanotube, cut by acid treatment, contains hydrophillic oxygen groups. Water molecules can self-assemble around these groups to seal off a carbon nanotube and form an "aqueous valve". Molecular dynamics simulations on single-wall (12,12) and (15,15) tubes with dangling carboxyl groups show that the formation of aqueous valves can be achieved both in the absence of and in the presence of high pressure hydrogen. Furthermore, significant diffusion barriers through aqueous valves are identified. It indicates that such valves could hold hydrogen inside the tube with GPa pressure. Releasing hydrogen is easily achieved by melting the "aqueous valve". Such a design provides a recyclable and non- destructive way to store hydrogen in GPa pressure. Under the storage conditions dictated by sealing off the container in liquid water, the hydrogen density inside the container is higher than that for solid hydrogen, which promises excellent weight storage efficiency.

  4. Pis'ma v ZhETF, vol.91, iss.6, pp.329{333 c 2010 March 25 Superconducting triplet spin valve

    E-Print Network [OSTI]

    Fominov, Yakov

    Pis'ma v ZhETF, vol.91, iss.6, pp.329{333 c 2010 March 25 Superconducting triplet spin valve Ya the parallel (P, = 0) and antiparallel (AP, = ) cases. This implies a possibility of a \\triplet" spin-valve e. In superconducting spin valves with the layer se- quence F1/S/F2 the superconducting transition temper- ature Tc

  5. Harold and Inge Marcus Department of Industrial and Manufacturing Engineering Fall 2010 Lubrication and Tool Wear in the Turning of Powdered Metal M2 Steel Valve

    E-Print Network [OSTI]

    Demirel, Melik C.

    Lubrication and Tool Wear in the Turning of Powdered Metal M2 Steel Valve Seats Final Report Overview) cutting insert on M2 steel valve seats. Two parameters were collected in order to perform a statistical was to analyze tool wear and the effect of select lubricants in the turning operation of powdered M2 metal valve

  6. In-situ magnetoresistance measurements during patterning of spin valve devices

    E-Print Network [OSTI]

    Morecroft, Deborah

    . This dissertation does not exceed the limit of length. Some of the work in this thesis has been published as listed below. Publications • “Control of the switching properties of magnetic thin films and spin valve devices by patterning”, D.Morecroft, C... .W. Leung, N.A. Stelmashenko, J.L. Prieto, D.B. Jardine and M.G. Blamire. IEEE Trans. Mag. 37 Issue: 4 Part: 1 (2001) pp. 2079 –2081. • “In-situ magnetoresistance measurements during patterning of thin films and spin valve devices”, D.Morecroft, C...

  7. Qualification of a Glassy Carbon Blade for a LHC Fast Vacuum Valve

    E-Print Network [OSTI]

    Garion, C

    2013-01-01T23:59:59.000Z

    To protect sensitive LHC machine systems against an unexpected gas inrush, a fast vacuum valve system is under development at CERN. The design of the shutter has to be compatible with dynamic loads occurring during the fast closure, namely in the 20 ms range. The material has to fulfil all main requirements such as transparency, high melting temperature, dust free and adequate leak tightness. A development of a blade in vitreous carbon material has been carried out at CERN. The blade has been successfully integrated in a commercial pendulum fast valve. In this paper, the vacuum and mechanical qualification tests are presented.

  8. Performance Evaluation of Hot Water Efficiency Plumbing System Using Thermal Valve

    E-Print Network [OSTI]

    Cha, K. S.; Park, M. S.; Seo, H. Y.

    hot water piping system, Thermo controlled valve, Circulation, Mixing water pipe, Recirculation water pipe INTRODUCTION Finding ways to conserve energy while heating a building?s water supply can be approached from a number of angles. Still...?s disadvantage is that so much water is wasted until the optimal tap temperature is reached.(6) We tried to solve this problem by developing a water-saving hot water plumbing system that utilizes a thermo-controlled valve. The goal was to not allow...

  9. Spin-transfer switching of orthogonal spin-valve devices at cryogenic temperatures

    SciTech Connect (OSTI)

    Ye, L., E-mail: ly17@nyu.edu; Gopman, D. B.; Rehm, L.; Backes, D.; Wolf, G.; Kent, A. D. [Department of Physics, New York University, New York, New York 10003 (United States); Ohki, T. [Raytheon BBN Technologies, Cambridge, Massachusetts 02138 (United States); Kirichenko, A. F.; Vernik, I. V.; Mukhanov, O. A. [HYPRES, 175 Clearbrook Road, Elmsford, New York 10523 (United States)

    2014-05-07T23:59:59.000Z

    We present the quasi-static and dynamic switching characteristics of orthogonal spin-transfer devices incorporating an out-of-plane magnetized polarizing layer and an in-plane magnetized spin valve device at cryogenic temperatures. Switching at 12?K between parallel and anti-parallel spin-valve states is investigated for slowly varied current as well as for current pulses with durations as short as 200 ps. We demonstrate 100% switching probability with current pulses 0.6?ns in duration. We also present a switching probability diagram that summarizes device switching operation under a variety of pulse durations, amplitudes, and polarities.

  10. Fail Save Shut Off Valve for Filtering Systems Employing Candle Filters

    DOE Patents [OSTI]

    VanOsdol, John

    2006-01-03T23:59:59.000Z

    The invention relates to an apparatus that acts as a fail save shut off valve. More specifically, the invention relates to a fail save shut off valve that allows fluid flow during normal operational conditions, but prevents the flow of fluids in the event of system failure upstream that causes over-pressurization. The present invention is particularly well suited for use in conjunction with hot gas filtering systems, which utilize ceramic candle filters. Used in such a hot gas system the present invention stops the flow of hot gas and prevents any particulate laden gas from entering the clean side of the system.

  11. Fail save shut off valve for filtering systems employing candle filters

    DOE Patents [OSTI]

    VanOsdol, John (Fairmont, WV)

    2006-01-03T23:59:59.000Z

    The invention relates to an apparatus that acts as a fail save shut off valve. More specifically, the invention relates to a fail save shut off valve that allows fluid flow during normal operational conditions, but prevents the flow of fluids in the event of system failure upstream that causes over-pressurization. The present invention is particularly well suited for use in conjunction with hot gas filtering systems, which utilize ceramic candle filters. Used in such a hot gas system the present invention stops the flow of hot gas and prevents any particulate laden gas from entering the clean side of the system.

  12. SUSTAINABILITY WHO CAN APPLY

    E-Print Network [OSTI]

    FUNDED BY CALL FOR SUSTAINABILITY RESEARCH STUDENT WHO CAN APPLY Undergraduate and graduate Participate in the Global Change & Sustainability Center's Research Symposium; attend workshops with faculty or publish in the U's student-run sustainability publication to be released in May 2014. Are you conducting

  13. Applied Microbiology and Biotechnology

    E-Print Network [OSTI]

    Alvarez-Cohen, Lisa

    1 23 Applied Microbiology and Biotechnology ISSN 0175-7598 Appl Microbiol Biotechnol DOI 10.1007/s-Cohen #12;1 23 Your article is protected by copyright and all rights are held exclusively by Springer in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version

  14. Establishment of the mathematical model for diagnosing the engine valve faults by genetic

    E-Print Network [OSTI]

    Fernandez, Thomas

    in a six- cylinders/four-stroke cycle diesel engine, i.e. normal condition, valve-tappet clearance and gas for diagnosing the faults occurring in rotor-bearing system, but current computer programs cannot easily distinguish the orbit shapes automatically. Likewise, when diagnosing the faults in a rolling-element bearing

  15. Thermocapillary valve for droplet production and sorting Charles N. Baroud,1,

    E-Print Network [OSTI]

    Boyer, Edmond

    for use as microfluidic reactors, if active control of their formation and transport can be achieved. We as a microfluidic valve for two-phase flows. A theoretical model is developed to explain the forces acting on a drop in complex droplet microfluidic systems. PACS numbers: 47.61.-k, 47.55.dm Microfluidic droplets have been

  16. Strength and Fatigue of NT551 Silicon Nitride and NT551 Diesel Exhaust Valves

    SciTech Connect (OSTI)

    Andrews, M.J.; Wereszczak, A.A.; Kirkland, T.P.; Breder, K.

    2000-02-01T23:59:59.000Z

    The content of this report is excerpted from Mark Andrew's Ph.D. Thesis (Andrews, 1999), which was funded by a DOEYOTT High Temperature Materials Laboratory Graduate Fellowship. It involves the characterization of NT551 and valves fabricated with it. Greater detail of the described issues may be found in that reference or through communications with Andrew Wereszczak.

  17. Confined Dissipative Droplet Solitons in Spin-Valve Nanowires with Perpendicular Magnetic Anisotropy

    E-Print Network [OSTI]

    Hoefer, Mark

    in nanoscale structures for magnetic storage and computation, but dissipative droplet studies have so far been possibilities for the study of low-dimensional solitons and droplet applications in nanostructures. DOI: 10 is achieved in devices known as spin valves (SVs) [5­8], where two magnetic layers are separated

  18. Temperature impacts on the set pressure of soft seated pressure relief valves

    SciTech Connect (OSTI)

    Engel, J.J.; Zirps, G.T.; Gleason, R.B. [and others

    1995-11-01T23:59:59.000Z

    From a safety standpoint, regardless of plant or facility type, the most important pieces of equipment are the pressure relief devices. The most critical characteristics of a pressure relief device are its set pressure and the related relieving capacity. The Set Pressure of a pressure relief device is defined as that value of increasing inlet static pressure at which the discharge becomes continuous (ASME PTC 25-1994, Performance Test Codes). To preclude an unsafe overpressure situation, the set pressure of the pressure relief device must not exceed the maximum allowable working pressure of the equipment or system being protected. Because of testing facility limitations, size or pressure, pressure relief valves intended for elevated temperature service are often set using ambient temperature air. Adjustments are made to the ambient valve opening pressures to compensate for the temperature differences. The extent of the adjustments to the pressure relief valve set pressure is important to ensure the valve will provide the required overpressure protection at the elevated in-service temperature.

  19. Design and Operation of a Fast Electromagnetic Inductive Massive Gas Injection Valve for NSTX-Ua)

    E-Print Network [OSTI]

    Princeton Plasma Physics Laboratory

    for the sliding piston. The pressure rise in the test chamber is measured directly using a fast time response based on valve opening times and orifice size, in these studies the vessel pressure increase following injects the required amount of gas (200 Torr.L, at an operating pressure of just 7000 Torr) in less than 3

  20. Evidence for spin selectivity of triplet pairs in superconducting spin valves

    E-Print Network [OSTI]

    Banerjee, N.; Smiet, C. B.; Smits, R. G. J.; Ozaeta, A.; Bergeret, F. S.; Blamire, M. G.; Robinson, J. W. A.

    2014-01-09T23:59:59.000Z

    in spintronics to control the flow of electrons by ferromagnets in a ferromagnet (F1)/normal metal (N)/ferromagnet (F2) spin valve, where F1 acts as the polarizer and F2 the analyser. The feasibility of superconducting spintronics depends on the spin sensitivity...

  1. A New Cone-Shaped Aortic Valve Prosthesis for Orthotopic Position: An Experimental Study in Swine

    SciTech Connect (OSTI)

    Sochman, Jan, E-mail: jan.sochman@medicon.c [Institute for Clinical and Experimental Medicine, Clinic of Cardiology (Czech Republic); Peregrin, Jan H.; Pulda, Zdenek [Institute for Clinical and Experimental Medicine, Department of Diagnostic and Interventional Radiology (Czech Republic); Pavcnik, Dusan; Uchida, Barry T.; Timmermans, Hans A.; Roesch, Josef [Oregon Health and Science University, Dotter Interventional Institute (United States)

    2010-04-15T23:59:59.000Z

    The aim of this experimental study was to evaluate a newly designed cone-shaped aortic valve prosthesis (CAVP) for one-step transcatheter placement in an orthotopic position. The study was conducted in 15 swine using either the transcarotid (11 animals) or the transfemoral (4 animals) artery approach. A 12- or 13-Fr sheath was inserted via arterial cutdown. The CAVP was deployed under fluoroscopic control and its struts, by design, induced significant native valve insufficiency. CAVP function was evaluated by aortography and aortic pressure curve tracing. In 11 of 15 swine the CAVP was properly deployed and functioned well throughout the scheduled period of 2-3 h. In three swine the CAVPs were placed lower than intended, however, they were functional even in the left ventricular outflow tract position. One swine expired due to inadvertent low CAVP placement that caused both aortic regurgitation and immobilization of the anterior mitral valve leaflet by the valve struts. We conclude that this design of CAVP is relatively easy to deploy, works well throughout a short time period (2-3 h), and, moreover, seems to be reliable even in a lower-than-orthotopic position (e.g., infra-annulary space). Longer-term studies are needed for its further evaluation.

  2. Neural Network-Based Noise Suppressor and Predictor for Quantifying Valve Stiction in Oscillatory Control Loops

    E-Print Network [OSTI]

    Annan, Carl Ashie

    2014-12-18T23:59:59.000Z

    . This work proposes a neural network approach to quantify the degree of stiction in a valve once the phenomenon has been detected. Several degrees of stiction are simulated in a closed loop control system by specifying the magnitude of static (fs) and dynamic...

  3. SAE 2002-01-1106 Modeling and Control of Electromechanical Valve Actuator

    E-Print Network [OSTI]

    Stefanopoulou, Anna

    fractions. Fuel economy can be improved through unthrottled load control and cylinder deactivation. Internal load torque. Although a conventional valvetrain system limits engine performance, it has operational advantages. The valve motion is controlled by a cam profile that is carefully designed to give low seating

  4. MS17AM LEAK CHECKER The MS17AM is a manual valve version of the MS17AB. Since it is a manual unit, some care must be

    E-Print Network [OSTI]

    Massey, Thomas N.

    MS17AM LEAK CHECKER The MS17AM is a manual valve version of the MS17AB. Since it is a manual unit, some care must be exercised in the sequencing of the valves. The most important things to remember are that during normal leak testing: 1. The THROTTLE VALVE is NEVER opened unless the ROUGH VALVE has been

  5. Regulatory instrument review: Aging management of LWR cables, containment and basemat, reactor coolant pumps, and motor-operated valves

    SciTech Connect (OSTI)

    Werry, E.V.; Somasundaram, S.

    1995-09-01T23:59:59.000Z

    The results of Stage 2 of the Regulatory Instrument Review are presented in this volume. Selected regulatory instruments, such as the Code of Federal Regulations (CFR), US Nuclear Regulatory Commission (NRC), Regulatory Guides, and ASME Codes, were investigated to determine the extent to which these regulations apply aging management to selected safety-related components in nuclear power plants. The Regulatory Instrument Review was funded by the NRC under the Nuclear Plant Aging Research (NPAR) program. Stage 2 of the review focused on four safety-related structures and components; namely, cables, containment and basemat, reactor coolant pumps, and motor-operated valves. The review suggests that the primary-emphasis of the regulatory instruments was on the design, construction, start-up, and operation of a nuclear power plant, and that aging issues were primarily addressed after an aging-related problem was recognized. This Stage 2 review confirms the results of the prior review; (see Regulatory Instrument Review: Management of Aging of LWR Major Safety-Related Components NUREG/CR-5490. The observations indicate that the regulations generally address management of age-related degradation indirectly. Specific age-related degradation phenomena frequently are dealt with in bulletins and notices or through generic issues, letters, etc. The major recommendation of this report, therefore, is that the regulatory instruments should more directly and explicitly address the aging phenomenon and the management of the age-related degradation process.

  6. Applied ALARA techniques

    SciTech Connect (OSTI)

    Waggoner, L.O.

    1998-02-05T23:59:59.000Z

    The presentation focuses on some of the time-proven and new technologies being used to accomplish radiological work. These techniques can be applied at nuclear facilities to reduce radiation doses and protect the environment. The last reactor plants and processing facilities were shutdown and Hanford was given a new mission to put the facilities in a safe condition, decontaminate, and prepare them for decommissioning. The skills that were necessary to operate these facilities were different than the skills needed today to clean up Hanford. Workers were not familiar with many of the tools, equipment, and materials needed to accomplish:the new mission, which includes clean up of contaminated areas in and around all the facilities, recovery of reactor fuel from spent fuel pools, and the removal of millions of gallons of highly radioactive waste from 177 underground tanks. In addition, this work has to be done with a reduced number of workers and a smaller budget. At Hanford, facilities contain a myriad of radioactive isotopes that are 2048 located inside plant systems, underground tanks, and the soil. As cleanup work at Hanford began, it became obvious early that in order to get workers to apply ALARA and use hew tools and equipment to accomplish the radiological work it was necessary to plan the work in advance and get radiological control and/or ALARA committee personnel involved early in the planning process. Emphasis was placed on applying,ALARA techniques to reduce dose, limit contamination spread and minimize the amount of radioactive waste generated. Progress on the cleanup has,b6en steady and Hanford workers have learned to use different types of engineered controls and ALARA techniques to perform radiological work. The purpose of this presentation is to share the lessons learned on how Hanford is accomplishing radiological work.

  7. A custom-designed limited-angle actuator for an electromechanical engine valve drive Part I: Conceptual design

    E-Print Network [OSTI]

    Qiu, Yihui

    Research has shown that variable valve timing (VVT) can improve significantly the performance of internal combustion (IC) engines, including higher fuel efficiencies, lower emissions, and larger torque outputs at each point ...

  8. A custom-designed limited-angle actuator for an electromechanical engine valve drive Part II: Fabrication and evaluation

    E-Print Network [OSTI]

    Kassakian, John G.

    Research has shown that variable valve timing (VVT) can improve significantly the performance of internal combustion (IC) engines, including higher fuel efficiencies, lower emissions, and larger torque outputs at each point ...

  9. Application of Gene Network Analysis Techniques Identifies AXIN1/PDIA2 and Endoglin Haplotypes Associated with Bicuspid Aortic Valve

    E-Print Network [OSTI]

    Housman, David E.

    Bicuspid Aortic Valve (BAV) is a highly heritable congenital heart defect. The low frequency of BAV (1% of general population) limits our ability to perform genome-wide association studies. We present the application of ...

  10. Replace Pressure-Reducing Valves with Backpressure Turbogenerators (International Fact Sheet), Energy Tips-Steam, Steam Tip Sheet #20c

    SciTech Connect (OSTI)

    Not Available

    2010-10-01T23:59:59.000Z

    This English/Chinese ITP steam tip sheet on replacing pressure-reducing valves provides how-to advice for improving industrial steam systems using low-cost, proven practices and technologies.

  11. Evaluation of main feedwater line instability due to the sudden opening of flow control valve

    SciTech Connect (OSTI)

    Kathiresan, R.M.; Huang, S.M.; Tonet, N.

    1983-11-01T23:59:59.000Z

    Feedwater piping in a nuclear power plant can be subjected to transient forces due to the sudden opening of flow control valves. A numerical analysis of the valve transient problem is performed to simulate an incident that occurred at an operating facility. The results of the investigation of hydrodynamic loads on the feedwater lines and the dynamic structural response due to the aforementioned event are presented. The computer code WAVENET is employed to calculate the fluid transient response and hydrodynamic loads. The NUPIPE finite element computer program is used to calculate the structural response of the feedwater piping and piping support for these transient hydrodynamic loads. Based on the analysis, potential problem areas in the feedwater pipeline in terms of both support loads and stresses are identified. The results obtained successfully verify the mathematical modeling procedure of the failure of the pipe supports and snubbers.

  12. Influence of pressurizer relief valves on success of ``feed and bleed`` procedure

    SciTech Connect (OSTI)

    Petelin, S.; Mavko, B.; Gortnar, O. [Univ. of Ljubljana (Slovenia). Reactor Engineering Division

    1994-12-31T23:59:59.000Z

    The RELAP5/MOD3.1 analysis of the accident with total loss of secondary heat sink was performed for Krsko nuclear power plant which is a two loop Westinghouse PWR power plant of 1,876 MW thermal power. In the study of ``feed and bleed`` accident managing the particular attention was given to the emergency operating procedures foreseen operator actions. This paper deals with the modeling of saturated liquid and two-phase mixture critical discharge through the pressurizer power operated relief valves and aims to evaluate its influence on the simulation of other thermal-hydraulic processes in the reactor coolant system. The time evolution of simulated accident and the determination of the longest allowed operator response time for the successful accident managing were shown to be much dependent on the prediction of critical flow through the pressurizer relief valves.

  13. Zero Energy Peak and Triplet Correlations in Nanoscale SFF Spin-Valves

    E-Print Network [OSTI]

    Mohammad Alidoust; Klaus Halterman; Oriol T. Valls

    2015-06-17T23:59:59.000Z

    Using a self-consistent Bogoliubov-de Gennes approach, we theoretically study the proximity-induced density of states (DOS) in clean SFF spin-valves with noncollinear exchange fields. Our results clearly demonstrate a direct correlation between the presence of a zero energy peak (ZEP) in the DOS spectrum and the persistence of spin-1 triplet pair correlations. By systematically varying the geometrical and material parameters governing the spin-valve, we point out to experimentally optimal system configurations where the ZEPs are most pronounced, and which can be effectively probed via scanning tunneling microscopy. We complement these findings in the ballistic regime by employing the Usadel formalism in the full proximity limit to investigate their diffusive SFF counterparts. We determine the optimal normalized ferromagnetic layer thicknesses which result in the largest ZEPs. Our results can serve as guidelines in designing samples for future experiments.

  14. Lateral spin valves with two-different Heusler-alloy electrodes on the same platform

    SciTech Connect (OSTI)

    Oki, S.; Yamada, S.; Tanikawa, K.; Yamasaki, K.; Miyao, M.; Hamaya, K., E-mail: hamaya@ed.kyushu-u.ac.jp [Department of Electronics, Kyushu University, 744 Motooka, Fukuoka 819-0395 (Japan)

    2013-11-18T23:59:59.000Z

    Using room-temperature molecular beam epitaxy on Si(111), we demonstrate Heusler-alloy bilayers consisting of L2{sub 1}-Co{sub 2}FeSi (CFS) and D0{sub 3}-Fe{sub 3}Si (FS). By fabricating lateral spin valves with L2{sub 1}-CFS and D0{sub 3}-FS electrodes, we can see ideal spin signals even though we use one L2{sub 1}-CFS as a spin injector and another D0{sub 3}-FS as a spin detector. The difference in the spin absorption between L2{sub 1}-CFS and D0{sub 3}-FS can also be examined, and we find that the spin resistance of D0{sub 3}-FS is larger than that of L2{sub 1}-CFS. This work will be useful for understanding spin transport in lateral spin-valve devices with different Heusler-alloy electrodes.

  15. Giant amplification of tunnel magnetoresistance in a molecular junction: Molecular spin-valve transistor

    SciTech Connect (OSTI)

    Dhungana, Kamal B.; Pati, Ranjit, E-mail: patir@mtu.edu [Department of Physics, Michigan Technological University, Houghton, Michigan 49931 (United States)

    2014-04-21T23:59:59.000Z

    Amplification of tunnel magnetoresistance by gate field in a molecular junction is the most important requirement for the development of a molecular spin valve transistor. Herein, we predict a giant amplification of tunnel magnetoresistance in a single molecular spin valve junction, which consists of Ru-bis-terpyridine molecule as a spacer between two ferromagnetic nickel contacts. Based on the first-principles quantum transport approach, we show that a modest change in the gate field that is experimentally accessible can lead to a substantial amplification (320%) of tunnel magnetoresistance. The origin of such large amplification is attributed to the spin dependent modification of orbitals at the molecule-lead interface and the resultant Stark effect induced shift in channel position with respect to the Fermi energy.

  16. Bimodal switching field distributions in all-perpendicular spin-valve nanopillars

    SciTech Connect (OSTI)

    Gopman, D. B., E-mail: daniel.gopman@physics.nyu.edu; Kent, A. D. [Department of Physics, New York University, New York, New York 10003 (United States); Bedau, D.; Katine, J. A. [HGST San Jose Research Center, San Jose, California 95135 (United States); Mangin, S. [Institut Jean Lamour, UMR CNRS 7198 Université de Lorraine, Nancy (France); Fullerton, E. E. [CMRR, University of California at San Diego, La Jolla, California 92093 (United States)

    2014-05-07T23:59:59.000Z

    Switching field measurements of the free layer element of 75?nm diameter spin-valve nanopillars reveal a bimodal distribution of switching fields at low temperatures (below 100?K). This result is inconsistent with a model of thermal activation over a single perpendicular anisotropy barrier. The correlation between antiparallel to parallel and parallel to antiparallel switching fields increases to nearly 50% at low temperatures. This reflects random fluctuation of the shift of the free layer hysteresis loop between two different magnitudes, which may originate from changes in the dipole field from the polarizing layer. The magnitude of the loop shift changes by 25% and is correlated to transitions of the spin-valve into an antiparallel configuration.

  17. Testing of one-inch UF{sub 6} cylinder valves under simulated fire conditions

    SciTech Connect (OSTI)

    Elliott, P.G. [Martin Marietta Energy Systems, Inc., Paducah, KY (United States)

    1991-12-31T23:59:59.000Z

    Accurate computational models which predict the behavior of UF{sub 6} cylinders exposed to fires are required to validate existing firefighting and emergency response procedures. Since the cylinder valve is a factor in the containment provided by the UF{sub 6} cylinder, its behavior under fire conditions has been a necessary assumption in the development of such models. Consequently, test data is needed to substantiate these assumptions. Several studies cited in this document provide data related to the behavior of a 1-inch UF{sub 6} cylinder valve in fire situations. To acquire additional data, a series of tests were conducted at the Paducah Gaseous Diffusion Plant (PGDP) under a unique set of test conditions. This document describes this testing and the resulting data.

  18. Project W-314 Specific Test and Evaluation Plan 241-AN-A Valve Pit

    SciTech Connect (OSTI)

    HAMMERS, J.S.

    1999-08-25T23:59:59.000Z

    The purpose of this Specific Test and Evaluation Plan (STEP) is to provide a detailed written plan for the systematic testing of modifications made to the 241-AN-A Valve Pit by the W-314 Project. The STEP develops the outline for test procedures that verify the system's performance to the established Project design criteria. The STEP is a lower tier document based on the W-314 Test and Evaluation Plan (TEP).

  19. Expanding Robust HCCI Operation with Advanced Valve and Fuel Control Technologies

    SciTech Connect (OSTI)

    Szybist, J. P. [Oak Ridge National Lab., Oak Ridge, TN (United States); Confer, K. [Delphi Automotive Systems (United States)

    2012-09-11T23:59:59.000Z

    Delphi Automotive Systems and ORNL established this CRADA to advance the commercialization potential of the homogeneous charge compression ignition (HCCI) advanced combustion strategy for gasoline engine platforms. HCCI combustion has been shown by others to produce high diesel-like efficiency on a gasoline engine platform while simultaneously producing low NOX and particulate matter emissions. However, the commercialization barriers that face HCCI combustion are significant, with requirements for a more active engine control system, likely with next-cycle closed-loop feedback control, and with advanced valve train technologies to enable negative valve overlap conditions. In the partnership between Delphi and ORNL, each organization brought a unique and complementary set of skills to the project. Delphi has made a number of breakthroughs with production-intent valve train technologies and controls in recent years to make a part time production-intent HCCI engine plausible. ORNL has extensive knowledge and expertise with HCCI combustion, and also has a versatile research engine with hydraulic valve actuation (HVA) that is useful for guiding production of a cam-based HCCI system. Partnering these knowledge bases and capabilities was essential towards making progress to better understand HCCI combustion and the commercialization barriers that it faces. ORNL and Delphi maintained strong collaboration throughout the project. Meetings were held regularly, with additional reports, presentations, and meetings as necessary to maintain progress. Delphi provided guidance to ORNL regarding operational strategies to investigate on their single-cylinder research engine with HVA and data from their experimental multi-cylinder engine for modeling. ORNL provided single-cylinder engine data and modeling results.

  20. Electronic waiting-time distribution of a quantum-dot spin valve

    E-Print Network [OSTI]

    Björn Sothmann

    2014-10-27T23:59:59.000Z

    We discuss the electronic waiting-time distribution of a quantum-dot spin valve, i.e. a single-level quantum dot coupled to two ferromagnetic electrodes with magnetizations that can point in arbitrary directions. We demonstrate that the rich transport physics of this setup such as dynamical channel blockade and spin precession in an interaction-driven exchange field shows up in the waiting-time distribution and analyze the conditions necessary to observe the various effects.

  1. Operational Experience and Consolidations for the Current Lead Control Valves of the Large Hadron Collider

    E-Print Network [OSTI]

    Perin, A; Pirotte, O; Krieger, B; Widmer, A

    2012-01-01T23:59:59.000Z

    The Large Hadron Collider superconducting magnets are powered by more than 1400 gas cooled current leads ranging from 120 A to 13000 A. The gas flow required by the leads is controlled by solenoid proportional valves with dimensions from DN 1.8 mm to DN 10 mm. During the first months of operation, signs of premature wear were found in the active parts of the valves. This created major problems for the functioning of the current leads threatening the availability of the LHC. Following the detection of the problems, a series of measures were implemented to keep the LHC running, to launch a development program to solve the premature wear problem and to prepare for a global consolidation of the gas flow control system. This article describes first the difficulties encountered and the measures taken to ensure a continuous operation of the LHC during the first year of operation. The development of new friction free valves is then presented along with the consolidation program and the test equipment developed to val...

  2. School of Applied Technology School of Applied Technology

    E-Print Network [OSTI]

    Heller, Barbara

    School of Applied Technology School of Applied Technology Daniel F. and Ada L. Rice Campus Illinois Institute of Technology 201 E. Loop Road Wheaton, IL 60187 630.682.6000 www.iit.edu/applied tech/ Dean and Academic Director, Information Technology and Management Programs: C. Robert Carlson Director of Operations

  3. School of Applied Technology School of Applied Technology

    E-Print Network [OSTI]

    Heller, Barbara

    School of Applied Technology School of Applied Technology Daniel F. and Ada L. Rice Campus Illinois Institute of Technology 201 E. Loop Road Wheaton, IL 60187 630.682.6000 www.iit.edu/applied tech/ Dean Technology and Management Programs: Mazin Safar Director, Marketing & Development: Scott Pfeiffer Director

  4. Pis'ma v ZhETF, vol. 97, iss. 8, pp. 549 553 c 2013 April 25 Peculiarities of performance of the spin valve for the superconducting

    E-Print Network [OSTI]

    Fominov, Yakov

    of the spin valve for the superconducting current P. V. Leksin, A. A. Kamashev, N. N. Garif'yanov, I. A The spin valve effect for the superconducting current based on the superconductor/ferromagnet prox- imity of the spin valve effect occurs at dFe1 dFe2. At the optimal value of dFe1 almost full switching from

  5. ISSN 0021 3640, JETP Letters, 2013, Vol. 97, No. 8, pp. 478482. Pleiades Publishing, Inc., 2013. The possibility to create a spin valve, based on the

    E-Print Network [OSTI]

    Fominov, Yakov

    . 478 The possibility to create a spin valve, based on the superconductor/ferromagnet (S/F) proximity valve for the superconducting current have been theoretically pro posed. The first one [1] is the F1/F2 of the magnetizations in the F/S/F structure on Tc (see, e.g., [4­9]). How ever, the magnitude of the spin valve effect

  6. Applied inductive learning Louis Wehenkel

    E-Print Network [OSTI]

    Wehenkel, Louis

    problems 20 2.3.1 Classes 20 2.3.2 Types of classi cation problems 20 2.3.3 Learning and test sets 21 2Applied inductive learning Louis Wehenkel University of Li`ege Faculty of Applied Sciences Course;#12;APPLIED INDUCTIVE LEARNING COURSE NOTES : OCTOBER 2000 LOUIS A. WEHENKEL University of Li#12;ege

  7. Applied inductive learning Louis Wehenkel

    E-Print Network [OSTI]

    Wehenkel, Louis

    .3.2 Types of classification problems 20 2.3.3 Learning and test sets 21 2.3.4 Decision or classificationApplied inductive learning Louis Wehenkel University of Liâ??ege Faculty of Applied Sciences Courseâ??e'' #12; #12; APPLIED INDUCTIVE LEARNING COURSE NOTES : OCTOBER 2000 LOUIS A. WEHENKEL University of Li

  8. Journal of Applied Ecology 2004

    E-Print Network [OSTI]

    Holl, Karen

    Journal of Applied Ecology 2004 41, 922­933 © 2004 British Ecological Society Blackwell Publishing-scale, Sacramento River, succession, vegetation Journal of Applied Ecology (2004) 41, 922­933 Introduction More than@ucsc.edu). #12;923 Riparian forest restoration © 2004 British Ecological Society, Journal of Applied Ecology, 41

  9. Journal of Applied Ecology 2002

    E-Print Network [OSTI]

    Holl, Karen

    Journal of Applied Ecology 2002 39, 960­970 © 2002 British Ecological Society Blackwell Science- tion, succession. Journal of Applied Ecology (2002) 39, 960­970 Introduction Efforts to reclaim@ucsc.edu). #12;961 Vegetation on reclaimed mines © 2002 British Ecological Society, Journal of Applied Ecology

  10. Applying Mathematics.... ... to catch criminals

    E-Print Network [OSTI]

    O'Leary, Michael

    Applying Mathematics.... ... to catch criminals Mike O'Leary Department of Mathematics Towson University Stevenson University Kappa Mu Epsion 2008 Mike O'Leary (Towson University) Applying mathematics Department Mike O'Leary (Towson University) Applying mathematics to catch criminals September 10, 2008 2 / 42

  11. Magnetism reflectometer study shows LiF layers improve efficiency in spin valve devices

    SciTech Connect (OSTI)

    Bardoel, Agatha A [ORNL; Lauter, Valeria [ORNL; Szulczewski, Greg J [ORNL

    2012-01-01T23:59:59.000Z

    New, more efficient materials for spin valves - a device used in magnetic sensors, random access memories, and hard disk drives - may be on the way based on research using the magnetism reflectometer at Oak Ridge National Laboratory (ORNL). Spin valve devices work by means of two or more conducting magnetic material layers that alternate their electrical resistance depending on the layers alignment. Giant magnetoresistance is a quantum mechanical effect first observed in thin film structures about 20 years ago. The effect is observed as a significant change in electrical resistance, depending on whether the magnetization of adjacent ferromagnetic layers is in a parallel or an antiparallel magnetic alignment. 'What we are doing here is developing new materials. The search for new materials suitable for injecting and transferring carriers with a preferential spin orientation is most important for the development of spintronics,' said Valeria Lauter, lead instrument scientist on the magnetism reflectometer at the Spallation Neutron Source (SNS), who collaborated on the experiment. The researchers discovered that the conductivity of such materials is improved when an organic polymer semiconductor layer is placed between the magnetic materials. Organic semiconductors are now the material of choice for future spin valve devices because they preserve spin coherence over longer times and distances than conventional semiconductors. While research into spin valves has been ongoing, research into organic semiconductors is recent. Previous research has shown that a 'conductivity mismatch' exists in spin valve systems in which ferromagnetic metal electrodes interface with such organic semiconductors as Alq3 ({pi}-conjugated molecule tris(8-hydroxy-quinoline) aluminium). This mismatch limits the efficient injection of the electrons from the electrodes at the interface with the semiconductor material. However, lithium fluoride (LiF), commonly used in light-emitting diodes, has been found to enhance the injection of electrons through the semiconductor. Researchers from the University of Alabama and ORNL used polarized neutrons at the magnetism reflectometer at SNS to investigate the electronic, magnetic, and structural properties of the electrodes in a novel system. In this system, the magnetic layers cobalt and Ni{sub 80}Fe{sub 20} are interfaced with spacer layers composed of the organic semiconductor Alq3. A coupling layer of LiF is inserted to separate the magnetized layers from the semiconductor. 'ALQ3 is an organic semiconductor material,' said Lauter. 'Normally in these systems a first magnetic layer is grown on a hard substrate so that one can get the controlled magnetic parameters. Then you grow the organic semiconductor layer, followed by another magnetic material layer, such as cobalt.' In addition to determining the effect of the LiF layers on the efficiency of the electron injection, the researchers wanted to determine the magnetic properties of the cobalt and Ni{sub 80}Fe{sub 20} as well as the interfacial properties: whether there is interdiffusion of cobalt through the LiF layer to the semiconductor, for example. The researchers used polarized neutrons at beam line 4A to probe the entire, layer-by-layer assembly of the system. 'Reflectometry with polarized neutrons is a perfect method to study thin magnetic films,' Lauter said. 'These thin films - if you put one on a substrate, you see it just like a mirror. However, this mirror has a very complicated internal multilayer structure. The neutrons look inside this complicated structure and characterize each and every interface. Due to the depth sensitivity of the method, we measure the structural and magnetic properties of each layer with the resolution of 0.5 nm. The neutron scattering results found that inserting LiF as a barrier significantly improves the quality of the interface, increasing the injection of electrons from the magnetic layer through the organic semiconductor in the spin valve and enhancing the overall properties of the system. In related work the magneti

  12. Combustion, Control, and Fuel Effects in a Spark Assisted HCCI Engine Equipped with Variable Valve Timing

    SciTech Connect (OSTI)

    Bunting, Bruce G [ORNL

    2006-01-01T23:59:59.000Z

    Widespread implementation of homogeneous charge compression ignition (HCCI) engines is presently hindered by stability, control, and load range issues. Although the operable HCCI speed/load range is expanding, it is likely that the initial HCCI engines will rely on conventional combustion for part of the operating cycle. In the present study, we have investigated the role of fuel properties and chemistry on the operation of a spark-assisted gasoline HCCI engine. The engine employed is a single cylinder, 500 cc, port fuel injected research engine, operating near lambda = 1.0 and equipped with hydraulic variable valve actuation. HCCI is initiated by early exhaust valve closing to retain exhaust in the cylinder, thereby increasing the cylinder gas temperature. This is also referred to as a 'negative overlap' strategy. A total of 10 custom blended gasolines and three different batches of indolene from two suppliers were run at 5 speed-load combinations and performance was characterized by timing sweeps. Within the quality of the data set, we can say the all fuels provided equivalent combustion and performance characteristics when compared at the same combustion phasing. The fuels did, however, require different degrees of retained exhaust as measured by exhaust valve closing angle to achieve the same combustion phasing. Fuels with higher octane sensitivity were found to ignite more easily or more quickly and to burn more quickly than fuels with lower octane sensitivity. This is an expected result since the engine is naturally aspirated and operates with high compression temperatures due to the high retained exhaust fraction and recompression.

  13. Results from the Water Flow Test of the Tank 37 Backflush Valve

    SciTech Connect (OSTI)

    Fowley, M.D.

    2002-11-01T23:59:59.000Z

    A flow test was conducted in the Thermal Fluids Lab with the Tank 37 Backflush Valve to determine the pressure drop of water flow through the material transfer port. The flow rate was varied from 0 to 100 gpm. The pressure drop through the Backflush Valve for flow rates of 20 and 70 gpm was determined to be 0.18 and 1.77 feet of H2O, respectively. An equivalent length of the Backflush Valve was derived from the flow test data. The equivalent length was used in a head loss calculation for the Tank 37 Gravity Drain Line. The calculation estimated the flow rate that would fill the line up to the Separator Tank, and the additional flow rate that would fill the Separator Tank. The viscosity of the fluid used in the calculation was 12 centipoise. Two specific gravities were investigated, 1.4 and 1.8. The Gravity Drain Line was assumed to be clean, unobstructed stainless steel pipe. The flow rate that would fill the line up to the Separator Tank was 73 and 75 gpm for the 1.4 or 1.8 specific gravity fluids, respectively. The flow rate that would fill the Separator Tank was 96 and 100 gpm for the 1.4 or 1.8 specific gravity fluids, respectively. These results indicate that concentrate will not back up into the Separator Tank during evaporator normal operation, 15-25 gpm, or pot liftout, 70 gpm. A noteworthy observation during the flow test was water pouring from the holes in the catheterization tube. Water poured from the holes at 25 gpm and above. Data from the water flow test indicates that at 25 gpm the pressure drop through the Backflush Valve is 0.26 ft of H2O. A concentrate with a specific gravity of 1.8 and a viscosity of 12 cp will produce the same pressure drop at 20 gpm. This implies that concentrate from the evaporator may spill out into the BFV riser during a transfer.

  14. PULSED EDDY CURRENT THICKNESS MEASUREMENT OF SELECTIVE PHASE CORROSION ON NICKEL ALUMINUM BRONZE VALVES

    SciTech Connect (OSTI)

    Krause, T. W.; Harlley, D.; Babbar, V. K.; Wannamaker, K. [Department of Physics, Royal Military College of Canada, Kingston, ON, K7K 7B4 (Canada)

    2010-02-22T23:59:59.000Z

    Nickel Aluminum Bronze (NAB) is a material with marine environment applications that under certain conditions can undergo selective phase corrosion (SPC). SPC involves the removal of minority elements while leaving behind a copper matrix. Pulsed eddy current (PEC) was evaluated for determination of SPC thickness on a NAB valve section with access from the surface corroded side. A primarily linear response of PEC amplitude, up to the maximum available SPC thickness of 4 mm was observed. The combination of reduced conductivity and permeability in the SPC phase relative to the base NAB was used to explain the observed sensitivity of PEC to SPC thickness variations.

  15. Note: Hollow cathode lamp with integral, high optical efficiency isolation valve: A modular vacuum ultraviolet source

    SciTech Connect (OSTI)

    Sloan Roberts, F.; Anderson, Scott L. [Department of Chemistry, University of Utah, 315 S. 1400 E., Salt Lake City, Utah 84112 (United States)] [Department of Chemistry, University of Utah, 315 S. 1400 E., Salt Lake City, Utah 84112 (United States)

    2013-12-15T23:59:59.000Z

    The design and operating conditions of a hollow cathode discharge lamp for the generation of vacuum ultraviolet radiation, suitable for ultrahigh vacuum (UHV) application, are described in detail. The design is easily constructed, and modular, allowing it to be adapted to different experimental requirements. A thin isolation valve is built into one of the differential pumping stages, isolating the discharge section from the UHV section, both for vacuum safety and to allow lamp maintenance without venting the UHV chamber. The lamp has been used both for ultraviolet photoelectron spectroscopy of surfaces and as a “soft” photoionization source for gas-phase mass spectrometry.

  16. Reviews of ASME Section 11 pump and valve relief requests: Post Generic Letter 89-04

    SciTech Connect (OSTI)

    DiBiasio, A.

    1992-01-01T23:59:59.000Z

    This paper presents a discussion of ASME Section 11 Pump and Valve Inservice Testing relief request reviews by the NRC and their contractors. Topics that will be discussed include the scope of USNRC reviews in Technical Evaluation Reports (TERs) (and Safety Evaluation, SEs); including the basis for granting relief requests, the status of relief requests in IST Program updates, and the Generic Letter 89-04 approval process; and the level of technical detail required in submitted programs. This presentation is based on the experiences of Brookhaven National Laboratory in reviewing IST Programs for the Mechanical Engineering Branch of the US Nuclear Regulatory Commission.

  17. Reviews of ASME Section 11 pump and valve relief requests: Post Generic Letter 89-04

    SciTech Connect (OSTI)

    DiBiasio, A.

    1992-07-01T23:59:59.000Z

    This paper presents a discussion of ASME Section 11 Pump and Valve Inservice Testing relief request reviews by the NRC and their contractors. Topics that will be discussed include the scope of USNRC reviews in Technical Evaluation Reports (TERs) (and Safety Evaluation, SEs); including the basis for granting relief requests, the status of relief requests in IST Program updates, and the Generic Letter 89-04 approval process; and the level of technical detail required in submitted programs. This presentation is based on the experiences of Brookhaven National Laboratory in reviewing IST Programs for the Mechanical Engineering Branch of the US Nuclear Regulatory Commission.

  18. Voltage polarity manipulation of the magnetoresistance sign in organic spin valve devices

    SciTech Connect (OSTI)

    Jiang, S. W.; Chen, B. B.; Wang, P.; Zhou, Y.; Shi, Y. J.; Yue, F. J.; Ding, H. F.; Wu, D., E-mail: dwu@nju.edu.cn [National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, 22 Hankou Road, Nanjing 210093 (China)

    2014-06-30T23:59:59.000Z

    The spin transport in organic spin valve (OSV) devices has been systematically investigated by inserting a low work function material Al between ferromagnetic electrode and organic layer. The resistance and current-voltage curve symmetry are dramatically altered as increasing Al thickness, indicating that an electron-unipolar OSV is obtained. Moreover, the magnetoresistance sign depends on the voltage polarity for certain Al thickness. We attribute this phenomenon to the Fermi and the lowest unoccupied molecular orbits energies of the two electrodes responding to the spin injection and detection, respectively. These findings provide a simple approach to control both the carrier type and the spin direction simultaneously.

  19. Imaging of lateral spin valves with soft x-ray microscopy

    SciTech Connect (OSTI)

    Mosendz, O.; Mihajlovic, G.; Pearson, J. E.; Fischer, P.; Im, M.-Y.; Bader, S. D.; Hoffmann, A.

    2009-05-01T23:59:59.000Z

    We investigated Co/Cu lateral spin valves by means of high-resolution transmission soft x-ray microscopy with magnetic contrast that utilizes x-ray magnetic circular dichroism (XMCD). No magnetic XMCD contrast was observed at the Cu L{sub 3} absorption edge, which should directly image the spin accumulation in Cu. Although electrical transport measurements in a non-local geometry clearly detected the spin accumulation in Cu, which remained unchanged during illumination with circular polarized x-rays at the Co and Cu L{sub 3} absorption edges.

  20. Imaging of lateral spin valves with soft x-ray microscopy.

    SciTech Connect (OSTI)

    Mosendz, O.; Mihajlovic, G.; Pearson, J. E.; Fischer, P.; Im, M.-Y.; Bader, S. D.; Hoffmann, A.; LBNL

    2009-01-01T23:59:59.000Z

    We investigated Co/Cu lateral spin valves by means of high-resolution transmission soft x-ray microscopy with magnetic contrast that utilizes x-ray magnetic circular dichroism (XMCD). No magnetic XMCD contrast was observed at the Cu L{sub 3} absorption edge, which should directly image the spin accumulation in Cu, although electrical transport measurements in a nonlocal geometry clearly detected the spin accumulation in Cu, which remained unchanged during illumination with circular polarized x rays at the Co and Cu L{sub 3} absorption edges.

  1. Load Expansion of Stoichiometric HCCI Using Spark Assist and Hydraulic Valve Actuation

    SciTech Connect (OSTI)

    Szybist, James P [ORNL; Nafziger, Eric J [ORNL

    2010-01-01T23:59:59.000Z

    A spark-assist homogeneous charge compression ignition (SA-HCCI) operating strategy is presented here that allows for stoichiometric combustion from 1000-3000 rpm, and at loads as high as 750 kPa net IMEP. A single cylinder gasoline engine equipped with direct fuel injection and fully variable hydraulic valve actuation (HVA) is used for this experimental study. The HVA system enables negative valve overlap (NVO) valve timing for hot internal EGR. Spark-assist stabilizes combustion over a wide range of engine speeds and loads, and allows for stoichiometric operation at all conditions. Characteristics of both spark-ignited combustion and HCCI are present, with combustion analysis showing a distinctive spark ignited phase of combustion, followed by a much more rapid HCCI combustion phase. At high load, the maximum pressure rise rate is controlled by a combination of spark timing and retarding the intake valve closing angle. The latter reduces the effective compression ratio, and therefore the compressive temperatures, allowing the high load limit of the operating range to be expanded. The SA-HCCI operating strategy exhibits improved thermal efficiency at most operating conditions, with fuel consumption improvements up to 9% realized at light engine loads. The SA-HCCI operating strategy presented here does not provide an efficiency advantage at all operating points compared to SI combustion; a decrease was observed at the highest speed and at loads above 500 kPa net IMEP. At light engine loads the majority of the heat release takes place during the HCCI phase of the heat release, and as such the NOx emissions are very low and are similar to levels observed in pure HCCI. At higher loads, a larger portion of the heat release takes place during the spark ignited phase of combustion, which produces NOx emissions that are much higher than is typically associated with HCCI, but still represent a decrease from conventional SI combustion. By limiting the fuel/air mixture to stoichiometric conditions, the higher NOx emissions do not represent an implementation barrier to this strategy because compatibility is maintained with very effective conventional 3-way catalysts.

  2. APPLIED TECHNOLOGY Strategic Plan Summary

    E-Print Network [OSTI]

    Heller, Barbara

    and collaborative technology-based support for the proposed Innovation Center and the Entrepreneurship Academy. We research centers­CNR, CPI, and CSP. Establish a food safety and processing technology hub/incubator/innovationSCHOOL OF APPLIED TECHNOLOGY Strategic Plan Summary #12;School of Applied Technology Strategic Plan

  3. Department of Applied Mathematics Department of Applied Mathematics

    E-Print Network [OSTI]

    Heller, Barbara

    , computational mathematics, discrete applied mathematics, and stochas- tics. More detailed descriptions of Philosophy in Collegiate Mathematics Education (joint program with the Department of Mathematics and Science Education) Research Facilities The department provides students with office space equipped with computers

  4. A nonintrusive method for measuring the operating temperature of a solenoid-operated valve

    SciTech Connect (OSTI)

    Kryter, R.C.

    1990-01-01T23:59:59.000Z

    Experimental data are presented to show that the in-service operating temperature of a solenoid-operated valve (SOV) can be interred simply and nondisruptively by using the copper winding of the solenoid coil as a self-indicating, permanently available resistance thermometer. The principal merits of this approach include (a) there is no need for an add-on temperature sensor, (b) the true temperature of a critical --- and likely the hottest --- part of the SOV (namely, the electrical coil) is measured directly, (c) temperature readout can be provided at any location at which the SOV electrical lead wires are accessible (even though remote from the valve), (d) the SOV need not be disturbed (whether normally energized or deenergized) to measure its temperature in situ, and (e) the method is applicable to all types of SOVs, large and small, ac- and dc-powered. Laboratory tests comparing temperatures measured both by coil resistance and by a conventional thermometer placed in contact with the external surface of the potted solenoid coil indicate that temperature within the coil may be on the order of 40{degree}C higher than that measured externally, a fact that is important to life-expectancy calculations made on the basis of Arrhenius theory. Field practicality is illustrated with temperature measurements made using this method on a SOV controlling the flow of refrigerant in a large chilled-water air-conditioning system. 5 refs., 7 figs.

  5. Conductance valve and pressure-to-conductance transducer method and apparatus

    DOE Patents [OSTI]

    Schoeniger, Joseph S.; Cummings, Eric B.; Brennan, James S.

    2005-01-18T23:59:59.000Z

    A device for interrupting or throttling undesired ionic transport through a fluid network is disclosed. The device acts as a fluid valve by reversibly generating a fixed "bubble" in the conducting solvent solution carried by the network. The device comprises a porous hydrophobic structure filling a portion of a connecting channel within the network and optionally incorporates flow restrictor elements at either end of the porous structure that function as pressure isolation barriers, and a fluid reservoir connected to the region of the channel containing the porous structure. Also included is a pressure pump connected to the fluid reservoir. The device operates by causing the pump to vary the hydraulic pressure to a quantity of solvent solution held within the reservoir and porous structure. At high pressures, most or all of the pores of the structure are filled with conducting liquid so the ionic conductance is high. At lower pressures, only a fraction of the pores are filled with liquid, so ionic conductivity is lower. Below a threshold pressure, the porous structure contains only vapor, so there is no liquid conduction path. The device therefore effectively throttles ionic transport through the porous structure and acts as a "conductance valve" or "pressure-to-conductance" transducer within the network.

  6. Vct system having closed loop control employing spool valve actuated by a stepper motor

    SciTech Connect (OSTI)

    Quin, S.B. Jr.; Siemon, E.C.

    1993-06-15T23:59:59.000Z

    An internal combustion engine is described comprising: a crankshaft, the crankshaft being rotable about an axis; a cam shaft, the cam shaft being rotatable about a second axis, the second axis being parallel to the axis, the cam shaft being subject to torque reversals during the rotation thereof; a vane, the vane having at least one lobe, the vane being attached to the cam shaft, being rotatable with the cam shaft and being non-oscillatable with respect to the cam shaft; a housing, the housing being rotatable with the cam shaft and being oscillatable with respect to the cam shaft, the housing having at least one recess, the recess receiving the lobe, the lobe being oscillatable within the recess; rotary movement transmitting means for transmitting rotary movement from the crankshaft to the housing; actuating means for varying the position of the housing relative to the cam shaft in reaction to torque reversals in the cam shaft, the actuating means comprising a stepper motor, a lead screw and a proportional spool valve, the position of the spool valve being controlled by the position of the lead screw driven by the stepper motor, the actuating means also delivering hydraulic fluid to the vane; and processing means for controlling the position of the actuating means.

  7. Modeling applied to problem solving

    E-Print Network [OSTI]

    Pawl, Andrew

    We describe a modeling approach to help students learn expert problem solving. Models are used to present and hierarchically organize the syllabus content and apply it to problem solving, but students do not develop and ...

  8. IIT SCHOOL OF APPLIED TECHNOLOGY

    E-Print Network [OSTI]

    Heller, Barbara

    INDUSTRIAL TECHNOLOGY AND MANAGEMENT IIT SCHOOL OF APPLIED TECHNOLOGY PREPARING SKILLED INDIVIDUALS, INDUSTRIAL FACILITIES, SUPPLY CHAIN MANAGEMENT, SUSTAINABILITY AND MANUFACTURING TECHNOLOGY. #12;BE ONE to assess, implement, and utilize current technologies, and to learn how to manage industrial operations

  9. Sustainable FACULTY OF APPLIED SCIENCE

    E-Print Network [OSTI]

    Michelson, David G.

    Working Together Towards a Sustainable Energy Future FACULTY OF APPLIED SCIENCE Clean Energy aspects of sustainable energy solutions, and is committed to using its extensive expertise to serve, Electrical & Computer, Materials, Mechanical, Mining), the School of Architecture & Landscape Architecture

  10. Adjustable Speed Drives as Applied to Centrifugal Pumps

    E-Print Network [OSTI]

    Jarc, D. A.; Robechek, J. D.; Connors, D. P.

    1982-01-01T23:59:59.000Z

    Required Power In addition to energy savings, which are discussed in detail later, operation at reduced pressures can result in longer pump seal life, reduced impeller wear, and less system vibration and noise. These benefits could provide additional... FLOW CONTROL TECHNIQUES Historically, centrifugal pumps have been driven by fixed speed A-C motors and reduced flow has been achieved by using control valves as shown in Figure 8. Closing the valve reduces the flow by increasing the friction...

  11. Relationship between valve activity, microalgae concentration in the water1 and toxin accumulation in the digestive gland2

    E-Print Network [OSTI]

    Brest, Université de

    1 Relationship between valve activity, microalgae concentration in the water1 and toxin harmful microalgae Heterocapsa triquetra (H.t.) were26 exposed to 4 microalgae mixtures at constant total of harmful microalgae on bivalve physiology and ecology; to test the45 putative interest of behavioral change

  12. Combustion Phasing Model for Control of a Gasoline-Ethanol Fueled SI Engine with Variable Valve Timing

    E-Print Network [OSTI]

    Combustion Phasing Model for Control of a Gasoline-Ethanol Fueled SI Engine with Variable Valve engine efficiency. Fuel-flexible engines permit the increased use of ethanol-gasoline blends. Ethanol points across the engine operating range for four blends of gasoline and ethanol. I. INTRODUCTION Fuel

  13. Airpath Control of a SI Engine with Variable Valve Timing Actuators Thomas Leroy, Jonathan Chauvin and Nicolas Petit

    E-Print Network [OSTI]

    a range wider than the one considered on conventional (fixed-valve timing) SI engine. VVT systems also allow internal exhaust gas recirculation leading to reduce Nitrogen Oxides (NOx) and Hydrocarbons (HC according to the driver's requests, while limiting pollutant emissions. On conventional SI engines, torque

  14. CX-009420: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Additive Manufacturing Using EOSINT M280 CX(s) Applied: None applied. Date: 10/30/2012 Location(s): Missouri Offices(s): Kansas City Site Office

  15. CX-009418: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Electron Beam Melting CX(s) Applied: None applied. Date: 10/30/2012 Location(s): Missouri Offices(s): Kansas City Site Office

  16. CX-010574: Categorical Exclusion Determination | Department of...

    Broader source: Energy.gov (indexed) [DOE]

    Exclusion Determination Applied Materials - Kerf-less Crystaline-Silicon Photovoltaic: Gas to Modules CX(s) Applied: B3.6 Date: 05162013 Location(s): California,...

  17. CX-009419: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Magnetic Pulser CX(s) Applied: None applied. Date: 10/30/2012 Location(s): Missouri Offices(s): Kansas City Site Office

  18. Effects of non-latching blast valves on the source term and consequences of the design-basis accidents in the Device Assembly Facility (DAF)

    SciTech Connect (OSTI)

    Nguyen, D.H.

    1993-08-01T23:59:59.000Z

    The analysis of the Design-Basis Accidents (DBA) involving high explosives (HE) and Plutonium (Pu) in the assembly cell of the Device Assembly Facility (DAF), which was completed earlier, assumed latching blast valves in the ventilation system of the assembly cell. Latching valves effectively sealed a release path through the ventilation duct system. However, the blast valves in the assembly cell, as constructed are actually non-latching valves, and would reopen when the gas pressure drops to 0.5 psi above one atmosphere. Because the reopening of the blast valves provides an additional release path to the environment, and affects the material transport from the assembly cell to other DAF buildings, the DOE/NV DAF management has decided to support an additional analysis of the DAF`s DBA to account for the effects of non-latching valves. Three cases were considered in the DAF`s DBA, depending on the amount of HE and Pu involved, as follows: Case 1 -- 423 {number_sign}HE, 16 kg Pu; Case 2 -- 150 {number_sign}HE 10 kg Pu; Case 3 -- 55 {number_sign}HE 5 kg Pu. The results of the analysis with non-latching valves are summarized.

  19. Enhanced spin signals due to native oxide formation in Ni{sub 80}Fe{sub 20}/Ag lateral spin valves.

    SciTech Connect (OSTI)

    Mihajlovic, G.; Schreiber, D. K.; Liu, Y.; Pearson, J. E.; Bader, S. D.; Petford-Long, A. K.; Hoffmann, A.; Northwestern Univ.

    2010-01-01T23:59:59.000Z

    Large nonlocal spin valve signals are reported in mesoscopic Ni{sub 80}Fe{sub 20}/Ag lateral spin valves upon exposing them to air. Magnetotransport measurements combined with transmission electron microscopy show that the formation of a native oxide layer at the Ni{sub 80}Fe{sub 20}/Ag interface is responsible for the large signals. The results indicate that lateral spin valves with superior performance to those based on high-resistance tunnel barriers can be achieved via controllable growth of native permalloy oxides.

  20. THE EFFECTS OF MAINTENANCE ACTIONS ON THE PFDavg OF SPRING OPERATED PRESSURE RELIEF VALVES

    SciTech Connect (OSTI)

    Harris, S.; Gross, R.

    2014-04-01T23:59:59.000Z

    The safety integrity level (SIL) of equipment used in safety instrumented functions is determined by the average probability of failure on demand (PFDavg) computed at the time of periodic inspection and maintenance, i.e., the time of proof testing. The computation of PFDavg is generally based solely on predictions or estimates of the assumed constant failure rate of the equipment. However, PFDavg is also affected by maintenance actions (or lack thereof) taken by the end user. This paper shows how maintenance actions can affect the PFDavg of spring operated pressure relief valves (SOPRV) and how these maintenance actions may be accounted for in the computation of the PFDavg metric. The method provides a means for quantifying the effects of changes in maintenance practices and shows how these changes impact plant safety.

  1. Investigation Of Adhesion Formation In New Stainless Steel Trim Spring Operated Pressure Relief Valves

    SciTech Connect (OSTI)

    Gross, Robert E. [Savannah River Site (SRS), Aiken, SC (United States); Bukowski, Julia V. [Villanova University, Villanova, PA (United States); Goble, William M. [exida, Sellersville, PA (United States)

    2013-04-16T23:59:59.000Z

    Examination of proof test data for new (not previously installed) stainless steel (SS) trim spring operated pressure relief valves (SOPRV) reveals that adhesions form between the seat and disc in about 46% of all such SOPRV. The forces needed to overcome these adhesions can be sufficiently large to cause the SOPRV to fail its proof test (FPT) prior to installation. Furthermore, a significant percentage of SOPRV which are found to FPT are also found to ''fail to open'' (FTO) meaning they would not relief excess pressure in the event of an overpressure event. The cases where adhesions result in FTO or FPT appear to be confined to SOPRV with diameters < 1 in and set pressures < 150 psig and the FTO are estimated to occur in 0.31% to 2.00% of this subpopulation of SS trim SOPRV. The reliability and safety implications of these finding for end-users who do not perform pre-installation testing of SOPRV are discussed.

  2. Molecular-Flow Properties of RIB Type Vapor-Transport Systems Using a Fast-Valve

    SciTech Connect (OSTI)

    Alton, Gerald D [ORNL] [ORNL; Bilheux, Hassina Z [ORNL] [ORNL; Zhang, Y. [Oak Ridge National Laboratory (ORNL)] [Oak Ridge National Laboratory (ORNL); Liu, Yuan [ORNL] [ORNL

    2014-01-01T23:59:59.000Z

    The advent of the fast-valve device, described previously, permits measurement of molecular-flow times of chemically active or inactive gaseous species through radioactive ion beam (RIB) target ion source systems, independent of size, geometry and materials of construction. Thus, decay losses of short-half-life RIBs can be determined for a given target/vapor-transport system in advance of on-line operation, thereby ascertaining the feasibility of the system design for successful processing of a given isotope. In this article, molecular-flow-time theory and experimentally measured molecular-flow time data are given for serial- and parallel-coupled Ta metal RIB vapor-transport systems similar to those used at ISOL based RIB facilities. In addition, the effect of source type on the molecular-flow time properties of a given system is addressed, and a chemical passivation method for negating surface adsorption enthalpies for chemically active gaseous species on Ta surfaces is demonstrated.

  3. Enhanced Component Performance Study: Motor-Operated Valves 1998–2012

    SciTech Connect (OSTI)

    T. E. Wierman

    2013-10-01T23:59:59.000Z

    This report presents an enhanced performance evaluation of motor-operated valves (MOVs) at U.S. commercial nuclear power plants. The data used in this study are based on the operating experience failure reports from fiscal year 1998 through 2012 for the component reliability as reported in the Equipment Performance and Information Exchange (EPIX). The MOV failure modes considered are failure to open/close, failure to operate or control, and spurious operation. The component reliability estimates and the reliability data are trended for the most recent 10-year period while yearly estimates for reliability are provided for the entire active period. No statistically significant increasing trends were identified in the MOV results. Statistically significant decreasing trends were identified for failure to open/close and operation demands.

  4. Helium pressures in RHIC vacuum cryostats and relief valve requirements from magnet cooling line failure

    SciTech Connect (OSTI)

    Liaw, C.J.; Than, Y.; Tuozzolo, J.

    2011-03-28T23:59:59.000Z

    A catastrophic failure of the RHIC magnet cooling lines, similar to the LHC superconducting bus failure incident, would pressurize the insulating vacuum in the magnet and transfer line cryostats. Insufficient relief valves on the cryostats could cause a structural failure. A SINDA/FLUINT{reg_sign} model, which simulated the 4.5K/4 atm helium flowing through the magnet cooling system distribution lines, then through a line break into the vacuum cryostat and discharging via the reliefs into the RHIC tunnel, had been developed to calculate the helium pressure inside the cryostat. Arc flash energy deposition and heat load from the ambient temperature cryostat surfaces were included in the simulations. Three typical areas: the sextant arc, the Triplet/DX/D0 magnets, and the injection area, had been analyzed. Existing relief valve sizes were reviewed to make sure that the maximum stresses, caused by the calculated maximum pressures inside the cryostats, did not exceed the allowable stresses, based on the ASME Code B31.3 and ANSYS results. The conclusions are as follows: (1) The S/F simulation results show that the highest internal pressure in the cryostats, due to the magnet line failure, is {approx}37 psig (255115 Pa); (2) Based on the simulation, the temperature on the cryostat chamber, INJ Q8-Q9, could drop to 228 K, which is lower than the material minimum design temperature allowed by the Code; (3) Based on the ASME Code and ANSYS results, the reliefs on all the cryostats inside the RHIC tunnel are adequate to protect the vacuum chambers when the magnet cooling lines fail; and (4) In addition to the pressure loading, the thermal deformations, due to the temperature decrease on the cryostat chambers, could also cause a high stress on the chamber, if not properly supported.

  5. Preliminary design for hot dirty-gas control-valve test facility. Final report

    SciTech Connect (OSTI)

    Not Available

    1980-01-01T23:59:59.000Z

    This report presents the results of a preliminary design and cost estimating effort for a facility for the testing of control valves in Hot Dirty Gas (HDGCV) service. This design was performed by Mittelhauser Corporation for the United States Department of Energy's Morgantown Energy Technology Center (METC). The objective of this effort was to provide METC with a feasible preliminary design for a test facility which could be used to evaluate valve designs under simulated service conditions and provide a technology data base for DOE and industry. In addition to the actual preliminary design of the test facility, final design/construction/operating schedules and a facility cost estimate were prepared to provide METC sufficient information with which to evaluate this design. The bases, assumptions, and limitations of this study effort are given. The tasks carried out were as follows: METC Facility Review, Environmental Control Study, Gas Generation Study, Metallurgy Review, Safety Review, Facility Process Design, Facility Conceptual Layout, Instrumentation Design, Cost Estimates, and Schedules. The report provides information regarding the methods of approach used in the various tasks involved in the completion of this study. Section 5.0 of this report presents the results of the study effort. The results obtained from the above-defined tasks are described briefly. The turnkey cost of the test facility is estimated to be $9,774,700 in fourth quarter 1979 dollars, and the annual operating cost is estimated to be $960,000 plus utilities costs which are not included because unit costs per utility were not available from METC.

  6. Journal of Applied Ecology 2006

    E-Print Network [OSTI]

    Thomas, Len

    Journal of Applied Ecology 2006 43, 377­384 © 2006 The Authors. Journal compilation © 2006 British Ecological Society Blackwell Publishing Ltd METHODOLOGICAL INSIGHTS Point transect sampling with traps, Etive House, Beechwood Park, Inverness IV2 3BW, UK Summary 1. The ability to monitor abundance of animal

  7. APPLIED MATHEMATICS AND SCIENTIFIC COMPUTING

    E-Print Network [OSTI]

    Rogina, Mladen

    APPLIED MATHEMATICS AND SCIENTIFIC COMPUTING Brijuni, Croatia June 23{27, 2003. y x Runge's example; Organized by: Department of Mathematics, Unversity of Zagreb, Croatia. Miljenko Maru#20;si#19;c, chairman;simir Veseli#19;c Andro Mikeli#19;c Sponsors: Ministry of Science and Technology, Croatia, CV Sistemi d

  8. Applied Sustainability Political Science 319

    E-Print Network [OSTI]

    Young, Paul Thomas

    1 Applied Sustainability Political Science 319 College of Charleston Spring 2013 Day/Time: TH 1 Address: fisherb@cofc.edu Office: 284 King Street, #206 (Office of Sustainability) Office Hours: by appt sustainability. It will focus on the development of semester-long sustainability projects, from conception

  9. California Energy Commission Apply Today!

    E-Print Network [OSTI]

    including HVAC and thermal energy storage system upgrades, stadium light conversion and a microturbineCalifornia Energy Commission Apply Today! "The College implemented all of the recommended projects Programs Office (916) 654-4147 pubprog@energy.state.ca.us "CEC financing allowed us to install many

  10. implementing bioenergy applied research & development

    E-Print Network [OSTI]

    Northern British Columbia, University of

    1 A Northern Centre for Renewable Energy implementing bioenergy applied research & development to develop local solutions to these challenges by integrating campus operations, education, and research will help the University meet its current and future energy needs, reduce or eliminate our greenhouse gas

  11. Estimating the Annual Water and Energy Savings in Texas A & M University Cafeterias using Low Flow Pre-Rinse Spray Valves 

    E-Print Network [OSTI]

    Rebello, Harsh Varun

    2011-08-08T23:59:59.000Z

    Improving the efficiency of a Pre- Rinse Spray Valve (PRSV) is one of the most cost effective water conservation methods in the Food Services Industry. A significant contributor to this cost efficiency is the reduction in the energy costs required...

  12. Does preservation of the sub-valvular apparatus during mitral valve replacement affect long-term survival and quality of life? A Microsimulation Study

    E-Print Network [OSTI]

    Rao, Christopher; Hart, Jonathan; Chow, Andre; Siannis, Fotios; Tsalafouta, Polyxeni; Murtuza, Bari; Darzi, Ara; Wells, Frank C; Athanasiou, Thanos

    2008-04-23T23:59:59.000Z

    Abstract Background Techniques to preserve the sub-valvular apparatus in order to reduce morbidity and mortality following mitral valve replacement have been frequently reported. However, it is uncertain what impact sub-valvular apparatus...

  13. Proceedings of the Third NRC/ASME Symposium on Valve and Pump Testing. Volume 2, Session 3A--Session 4B

    SciTech Connect (OSTI)

    Not Available

    1994-07-01T23:59:59.000Z

    The 1994 Symposium on Valve and Pump Testing, jointly sponsored by the Board of Nuclear Codes and Standards of the American Society of Mechanical Engineers and by the Nuclear Regulatory Commission, provides a forum for the discussion of current programs and methods for inservice testing and motor-operated valve testing at nuclear power plants. The symposium also provides an opportunity to discuss the need to improve that testing in order to help ensure the reliable performance of pumps and valves. The participation of industry representatives, regulators, and consultants results in the discussion of a broad spectrum of ideas and perspectives regarding the improvement of inservice testing of pumps and valves at nuclear power plants. Individual papers have been cataloged separately.

  14. Automatic flush valve performance (gallons per flush) measured from fixtures in a mixed-use classroom/office building at Texas A&M University

    E-Print Network [OSTI]

    Lertbannaphong, Salilla

    2005-08-29T23:59:59.000Z

    flush valve performance (gpf) of fixtures in a mixed use classroom building at Texas A&M University. Water consumption (gpf) among three types of fixtures; low-consumption manual, old optic automatic and improved optic automatic systems are measured...

  15. Proceedings of the Third NRC/ASME Symposium on Valve and Pump Testing. Session 1A--Session 2C: Volume 1

    SciTech Connect (OSTI)

    Not Available

    1994-07-01T23:59:59.000Z

    The 1994 Symposium on Valve and Pump Testing, jointly sponsored by the Board of Nuclear Codes and Standards of the American Society of Mechanical Engineers and by the Nuclear Regulatory Commission, provides a forum for the discussion of current programs and methods for inservice testing and motor-operated valve testing at nuclear power plants. The symposium also provides an opportunity to discuss the need to improve that testing in order to help ensure the reliable performance of pumps and valves. The participation of industry representatives, regulators, and consultants results in the discussion of a broad spectrum of ideas and perspectives regarding the improvement of inservice testing of pumps and valves at nuclear power plants. This document, Volume 1, covers sessions 1A through session 2C. The individual papers have been cataloged separately.

  16. Control methods and valve arrangement for start-up and shutdown of pressurized combustion and gasification systems integrated with a gas turbine

    DOE Patents [OSTI]

    Provol, Steve J. (Carlsbad, CA); Russell, David B. (San Diego, CA); Isaksson, Matti J. (Karhula, FI)

    1994-01-01T23:59:59.000Z

    A power plant having a system for converting coal to power in a gas turbine comprises a coal fed pressurized circulating bed for converting coal to pressurized gases, a gas turbine having a compressor for pressurizing air for the pressurized circulating bed and expander for receiving and expanding hot combustion gases for powering a generator, a first fast acting valve for controlling the pressurized air, a second fast acting valve means for controlling pressurized gas from the compressor to the expander.

  17. ESTIMATED SIL LEVELS AND RISK COMPARISONS FOR RELIEF VALVES AS A FUNCTION OF TIME-IN-SERVICE

    SciTech Connect (OSTI)

    Harris, S.

    2012-03-26T23:59:59.000Z

    Risk-based inspection methods enable estimation of the probability of spring-operated relief valves failing on demand at the United States Department of Energy's Savannah River Site (SRS) in Aiken, South Carolina. The paper illustrates an approach based on application of the Frechet and Weibull distributions to SRS and Center for Chemical Process Safety (CCPS) Process Equipment Reliability Database (PERD) proof test results. The methodology enables the estimation of ANSI/ISA-84.00.01 Safety Integrity Levels (SILs) as well as the potential change in SIL level due to modification of the maintenance schedule. Current SRS practices are reviewed and recommendations are made for extending inspection intervals. The paper compares risk-based inspection with specific SILs as maintenance intervals are adjusted. Groups of valves are identified in which maintenance times can be extended as well as different groups in which an increased safety margin may be needed.

  18. Dual function armchair graphene nanoribbon-based spin-photodetector: Optical spin-valve and light helicity detector

    SciTech Connect (OSTI)

    Ostovari, Fatemeh [Department of Physics, Tarbiat Modares University, P.O. Box 14115-335, Tehran 1411713116 (Iran, Islamic Republic of); Moravvej-Farshi, Mohammad Kazem, E-mail: Farshi-k@modares.ac.ir [Department of Physics, Tarbiat Modares University, P.O. Box 14115-335, Tehran 1411713116 (Iran, Islamic Republic of); Faculty of Electrical and Computer Engineering, Advanced Devices Simulation Lab (ADSL), Tarbiat Modares University, P.O. Box 14115-194, Tehran 1411713116 (Iran, Islamic Republic of)

    2014-08-18T23:59:59.000Z

    We show an armchair graphene nanoribbon channel connected between asymmetric ferromagnetic source-drain structure—i.e., p-type Co/Au/graphene source and n-type Co/Cu/graphene drain—can operate as dual function spin-photodetector, under zero external biases at room temperature. It can function as an optical spin-valve with magnetoresistance of greater than 60% and responsivity as high as 25.12?A/mW, when irradiated by an un-polarized light of energy ?3.03?eV. Under a circularly polarized illumination, this optical spin-valve can also operate as a light helicity detector. The calculated magnetoresistances for right and left circularly polarized lights are both greater than 60%.

  19. k-space spin filtering effect in the epitaxial Fe/Au/Fe/GaAs(001) spin-valve

    SciTech Connect (OSTI)

    Hervé, M.; Tricot, S.; Claveau, Y.; Delhaye, G.; Lépine, B.; Di Matteo, S.; Schieffer, P.; Turban, P., E-mail: pascal.turban@univ-rennes1.fr [Département Matériaux et Nanosciences, Institut de Physique de Rennes, UMR 6251, CNRS-Université de Rennes 1, Campus de Beaulieu, Bât 11E, 35042 Rennes cedex (France)

    2013-11-11T23:59:59.000Z

    The hot-electron magnetotransport of epitaxial Fe/Au/Fe/GaAs(001) spin-valves is investigated by ballistic-electron magnetic microscopy. A magnetocurrent amplitude larger than 500% is observed at room temperature close to the Schottky barrier energy. Remarkably, this magnetocurrent is not significantly affected by the thickness reduction of ferromagnetic films, down to 5 atomic layers of the Fe(001) top electrode. This rather suggests a dominant interfacial spin-filtering effect. Finally, the magnetocurrent is strongly reduced when the effective mass of the semiconductor collector is increased. These observations are consistent with recent theoretical prediction of k-space spin-filtering effect in epitaxial spin-valves attached to a semiconducting lead.

  20. Temperature dependent nucleation, propagation, and annihilation of domain walls in all-perpendicular spin-valve nanopillars

    SciTech Connect (OSTI)

    Gopman, D. B., E-mail: daniel.gopman@physics.nyu.edu; Kent, A. D. [Department of Physics, New York University, New York, New York 10003 (United States); Bedau, D. [Department of Physics, New York University, New York, New York 10003 (United States); HGST San Jose Research Center, San Jose, California 95135 (United States); Mangin, S. [Institut Jean Lamour, UMR CNRS 7198 Université de Lorraine, Nancy, France 54506 (France); Fullerton, E. E. [CMRR, University of California at San Diego, La Jolla, California 92093 (United States); Katine, J. A. [HGST San Jose Research Center, San Jose, California 95135 (United States)

    2014-03-21T23:59:59.000Z

    We present a study of the temperature dependence of the switching fields in Co/Ni-based perpendicularly magnetized spin-valves. While magnetization reversal of all-perpendicular Co/Ni spin valves at ambient temperatures is typically marked by a single sharp step change in resistance, low temperature measurements can reveal a series of resistance steps, consistent with non-uniform magnetization configurations. We propose a model that consists of domain nucleation, propagation, and annihilation to explain the temperature dependence of the switching fields. Interestingly, low temperature (<30?K) step changes in resistance that we associate with domain nucleation have a bimodal switching field and resistance step distribution, attributable to two competing nucleation pathways.