B - Operations – Transporting – 66 – C
Patent
B - Operations, Transporting
66
C
138/79.16
B66C 1/10 (2006.01) F15B 13/01 (2006.01)
Patent
CA 1168957
Abstract of the Disclosure 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 act- uator, 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 control- ling 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 Abstract (cont'd) after a predetermined time delay from the time when pilot pressure to said meter-out valve means is interrupted, ensuring relief valve protection.
400186
Marks & Clerk
Sperry Corporation
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