Valve with internal accumulator and check valve

Details Valve with internal accumulator and check valve Valve with internal accumulator and check valve

1979-02-22

1981-03-24

Michalsky, Gerald A.

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

1375135, 13762564, F16K 31124, F15B 13043, F15B 2000

Patent

active

042575729

ABSTRACT:
A solenoid controlled, pilot operated valve which is provided with a pilot air accumulator chamber in the pilot air supply to insure soundness of operation of the pilot air supply, and make the shifting characteristics of the valve relatively constant and positive. The main spool valve is shifted in one direction by pilot air and shifted in the other direction by either a return spring alone, or a return spring with an air assist. The accumulator chamber may be supplied with pilot air from an external source of pressurized air, or from an internal source within the valve. If an internal source of pilot air is employed, then a check valve is operatively mounted in an air passage between the valve supply chamber and the accumulator chamber to allow free flow into the accumulator chamber and restrict any air bleeding back to the valve supply chamber.

REFERENCES:
patent: 3038500 (1962-06-01), Lansky
patent: 3238972 (1966-03-01), Bowman
patent: 3595265 (1971-07-01), Cryder

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