Hydraulic control system for load supporting hydraulic motors

Details Hydraulic control system for load supporting hydraulic motors Hydraulic control system for load supporting hydraulic motors

1975-05-02

1977-02-08

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91447, 91461, 1375962, F15B 1108, F15B 13042

Patent

active

040066673

ABSTRACT:
A load supporting hydraulic system having a pilot operated main control valve is provided with pilot controlled load check valve operative to permit free flow of fluid from said control valve toward the load supporting means of the system in response to pilot pressure and to block fluid flow from the load supporting means toward the control valve. The system includes vent valve means operative with the main control valve to permit the load check valve to be opened by fluid pressure in the load supporting means to allow fluid flow therefrom to the reservoir.

REFERENCES:
patent: 2294702 (1942-09-01), Van der Werff
patent: 3049101 (1962-08-01), Ruhl
patent: 3068596 (1962-12-01), Hein et al.
patent: 3127688 (1964-04-01), Hein et al.
patent: 3530896 (1970-09-01), Whiteman, Jr.
patent: 3557829 (1971-01-01), Finley
patent: 3768518 (1973-10-01), Roth et al.

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