Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Patent
1981-05-28
1983-12-06
Garrett, Robert E.
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
91446, 251 28, 251 38, F15B 1304
Patent
active
044186126
ABSTRACT:
A hydraulic control system comprising a hydraulic actuator having opposed openings adapted to alternately function as inlets and outlets for moving the element of the actuator in opposite directions, a pump for supplying fluid to the actuator, pilot operated meter-in valve means to which the fluid from the pump is supplied for controlling the direction of movement of the actuator, meter-out valve means associated with each opening of the actuator for controlling the flow out of said actuator, and a pilot operated check valve operable for controlling flow from the meter-in valve means to one end of the actuator and for preventing flow out the end of said actuator, the pilot operated check valve being operable at a lower pilot pressure than the meter-out valve means and including time delay means such that the valve functions to prevent flow out of the actuator after a predetermined time delay from the time when pilot pressure to said meter-out valve means is interrupted, insuring relief valve protection.
REFERENCES:
patent: 3964505 (1976-06-01), McAvoy
patent: 3972267 (1976-08-01), Hook et al.
patent: 4006667 (1977-02-01), Bianchetta et al.
patent: 4138929 (1979-02-01), Peterson
patent: 4201052 (1980-05-01), Breeden et al.
patent: 4353289 (1982-10-01), Lonnemo
Garrett Robert E.
Meyer Richard S.
Vickers Incorporated
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