Valving for controlling a fluid-driven reciprocating apparatus
Patent
·
OSTI ID:869946
- Davis, CA
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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- Regents of University of California (Oakland, CA)
- Patent Number(s):
- US 5427507
- OSTI ID:
- 869946
- Country of Publication:
- United States
- Language:
- English
Free piston pumps for miniature rocket propulsion
|
conference | August 1991 |
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Related Subjects
/417/91/137/
actuating
addition
alternately
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assemblies
assembly
communication
communication therebetween
connected
constant
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control
control valve
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flow
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fluid
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logic
maximum
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opposite
overlap
pair
piston
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piston pump
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pressure
pressure communication
pressure responsive
pressure signal
pressurized
provide
pump
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pumps
range
rates
reciprocating
reciprocating apparatus
responsive
signal
signal depending
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substantially
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uninterrupted
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valve assembly
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actuating
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apparatus
applied
arranged
assemblies
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communication therebetween
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constant
constant pressure
control
control valve
controlling
counterpart
cylinder
delivery
dependent
depending
devices
enables
entirely
flow
flow rate
flow rates
fluid
fluid pressure
fluid-driven
fluid-driven free-piston
fluid-driven reciprocating
forward
free-piston
free-piston devices
frequency
intake-exhaust
intake-exhaust valve
liquid
liquid delivery
load
load applied
logic
maximum
mechanical
mechanical power
opposite
overlap
pair
piston
piston device
piston pump
pistons
power
power load
pressure
pressure communication
pressure responsive
pressure signal
pressurized
provide
pump
pumping
pumps
range
rates
reciprocating
reciprocating apparatus
responsive
signal
signal depending
speed
strokes
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substantially
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uninterrupted
valve
valve assemblies
valve assembly
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zero