Counterbalance valve

Details Counterbalance valve Counterbalance valve

1971-03-08

1977-02-22

Cohen, Irwin C.

Fluid handling

Self-proportioning or correlating systems

Supply and exhaust type

91420, 91447, 137501, F15B 13042, G05D 700

Patent

active

040087310

ABSTRACT:
A counterbalance valve assembly for controlling the lowering of an actuator driven load including a housing with a passage connected to deliver fluid to or from one side of the actuator. A main pilot-operated lock check valve is provided in this passage to selectively block flow from the actuator when it is desired that the load be held and also to move to an open position permitting return flow from the actuator with the open valve defining an orifice. The speed of the load is controlled by maintaining a constant pressure drop across this orifice with a compensator valve upstream of the main check valve, which serves the purpose of throttling flow from the actuator to the check valve.

REFERENCES:
patent: 2146537 (1939-02-01), Farnham
patent: 2644482 (1953-07-01), McCallum
patent: 3072107 (1963-01-01), Cassell
patent: 3198088 (1965-08-01), Johnson et al.
patent: 3207177 (1965-09-01), Nevulis
patent: 3234957 (1966-02-01), Allen
patent: 3272086 (1966-09-01), Soeters
patent: 3523490 (1970-08-01), Bianchetta
patent: 3524386 (1970-08-01), Cudnohufsky
patent: 3543784 (1970-12-01), Smith
patent: 3587393 (1971-06-01), Vick

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