Valving for controlling a fluid-driven reciprocating apparatus

Details Valving for controlling a fluid-driven reciprocating apparatus Valving for controlling a fluid-driven reciprocating apparatus

1993-06-25

1995-06-27

Bertsch, Richard A.

Pumps

Motor driven

Relatively movable pumping members driven by relatively...

417392, 417426, 13762566, 91189A, 91193, F04B 3502

Patent

active

054275075

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.

REFERENCES:
patent: 3524714 (1970-08-01), Grove et al.
patent: 3578025 (1971-05-01), Furrer
patent: 3768518 (1973-10-01), Roth et al.
patent: 4021156 (1977-05-01), Fuchs, Jr. et al.
patent: 4490096 (1984-12-01), Box
patent: 4541640 (1985-09-01), Tregonning
patent: 4714411 (1987-12-01), Searle
patent: 4722183 (1988-02-01), Rosen
patent: 4894986 (1990-01-01), Etheridge
patent: 5026259 (1991-06-01), Whitehead
AIAA91-1837, "Free Piston Pumps For Miniature Rocket Propulsion", J. C. Whitehead, Jun. 1991.
UCRL-JC-109568, "A Lightweight Pumped Hydrazine Maneuvering Vehicle", J. C. Whitehead, Jan. 1992.

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