Load check with mechanical venting means

Details Load check with mechanical venting means Load check with mechanical venting means

1977-04-07

1979-09-18

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91447, 1375962, F15B 1108, F15B 13042

Patent

active

041678923

ABSTRACT:
A hydraulic motor and control system therefor which includes a pump for delivering fluid to a control valve, the control valve having a Float position which connects a first end of the motor to a sump, a First position for applying fluid from the pump to power the motor in a first direction by delivering fluid to the first end of the motor via a flow path and a Second position in which the motor moves in a second and opposite direction. A conduit connects the control valve to the sump. A check valve is provided in the flow path which always allows flow therethrough towards the first end of the motor and normally blocks reverse flow therethrough and also a mechanism for opening the check valve to allow reverse flow therethrough responsive to operation of the control valve in the Float position and in the Second position.

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patent: 3800670 (1974-04-01), Hufeld et al.
patent: 3908515 (1975-09-01), Johnson
patent: 4006667 (1977-02-01), Bianchetta et al.
patent: 4018350 (1977-04-01), Brown

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