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Title: Valving for controlling a fluid-driven reciprocating apparatus

Abstract

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.

Inventors:
 [1]
  1. (Davis, CA)
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
869946
Patent Number(s):
5427507
Assignee:
Regents of University of California (Oakland, CA) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
valving; controlling; fluid-driven; reciprocating; apparatus; pair; control; valve; assemblies; alternately; actuating; free-piston; devices; fluid; pressure; communication; therebetween; assembly; switched; signal; depending; counterpart; piston; logic; arranged; provide; overlap; forward; strokes; pistons; pressurized; uninterrupted; pumping; liquid; pumps; addition; speed; frequency; stroking; entirely; dependent; mechanical; power; load; applied; enables; delivery; substantially; constant; range; flow; rates; zero; maximum; intake-exhaust; pump; connected; responsive; opposite; cylinder; pressure signal; signal depending; power load; substantially constant; flow rates; flow rate; control valve; valve assembly; fluid pressure; constant pressure; mechanical power; reciprocating apparatus; valve assemblies; load applied; piston device; pressure responsive; free-piston devices; liquid delivery; fluid-driven free-piston; intake-exhaust valve; fluid-driven reciprocating; pressure communication; piston pump; alternately actuating; communication therebetween; /417/91/137/

Citation Formats

Whitehead, John C. Valving for controlling a fluid-driven reciprocating apparatus. United States: N. p., 1995. Web.
Whitehead, John C. Valving for controlling a fluid-driven reciprocating apparatus. United States.
Whitehead, John C. Sun . "Valving for controlling a fluid-driven reciprocating apparatus". United States. https://www.osti.gov/servlets/purl/869946.
@article{osti_869946,
title = {Valving for controlling a fluid-driven reciprocating apparatus},
author = {Whitehead, John C.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1995},
month = {1}
}

Patent:

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