Double-acting, fluid-operated pump having pilot valve control of

Details Double-acting, fluid-operated pump having pilot valve control of Double-acting, fluid-operated pump having pilot valve control of

1977-01-03

1978-10-31

Croyle, Carlton R.

Pumps

Motor driven

Fluid motor

417395, 417397, 91307, 91329, F04B 1700, F04B 3500, F01L 2502

Patent

active

041232046

ABSTRACT:
A reciprocating, fluid operated pump, which is reversed at opposite ends of its travel by shifting of a directional valve, is characterized by a control valve for rapidly and completely shifting the directional valve.
In the disclosed embodiment, the pump includes a pair of pumping portions each operated by a respective reciprocating air motor. The air motors are coupled for conjoint reciprocation, and the directional valve alternately applies compressed air to one and then to the other of the air motors. The arrangement is such that when air is applied to one of the motors fluid is forced from its associated pumping portion to an outlet from the pump while fluid is drawn into the other pumping portion from an inlet to the pump, and when air is applied to the other of the motors fluid is forced from its associated pumping portion to the outlet from the pump while fluid is drawn from the pump inlet into the one pumping portion. The control valve is actuated in response to reciprocating movement of the air motors to each opposite end of their travel to positively, rapidly and completely shift the directional valve, whereby a continuous and substantially constant pressure flow of fluid is provided at the pump outlet.
As a consequence of using a control valve to operate the directional valve, as compared with using some mechanical means directly coupling movement of the valve with movement of the motors, the operation of the directional valve is very positive and rapid, and the period during which compressed air is applied to neither of the motors is minimized, whereby the pump is efficient and the fluid outlet pressure therefrom remains substantially constant.

REFERENCES:
patent: 274879 (1883-03-01), Barton et al.
patent: 571751 (1896-11-01), Crocker
patent: 1453561 (1923-05-01), Willshaw
patent: 2625886 (1953-01-01), Browne
patent: 3056353 (1962-10-01), Peters
patent: 3329094 (1967-07-01), Harklan
patent: 3741684 (1973-06-01), Sobieralski
patent: 3741687 (1973-06-01), Rupp

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