Valving for controlling a fluid-driven reciprocating apparatus

Patent · Tue Jun 27 04:00:00 EDT 1995

OSTI ID:87714

Whitehead, J C

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.

• Research Organization: University of California
• DOE Contract Number: W-7405-ENG-48
• Assignee: Univ. of California, Oakland, CA (United States)
• Patent Number(s): US 5,427,507/A/
• Application Number: PAN: 8-081,695
• OSTI ID: 87714
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
ACTUATORS
CONTROL EQUIPMENT
FLOW RATE
HYDRAULICS
LIQUIDS
OPERATION
PUMPS
VALVES