Counterbalance valve

Details Counterbalance valve Counterbalance valve

1979-01-15

1981-01-13

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

91445, 91447, 137106, 137501, F15B 13042

Patent

active

042442753

ABSTRACT:
A hydraulic system for raising and lowering a load by means of a fluid motor includes a counterbalance valve which controls the flow of fluid to and from the motor. The counterbalance valve has a pilot operated metering orifice which passes fluid from the motor when the load is lowered and a compensator valve which maintains a fixed pressure differential across the metering orifice. This results in a fixed flow of fluid through the metering orifice when the load is lowered.

REFERENCES:
patent: 2881793 (1959-04-01), Lee
patent: 3072107 (1963-01-01), Cassell
patent: 4008731 (1977-02-01), Katz
patent: 4172582 (1979-10-01), Bobnar

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