Control arrangement for a hydraulically operated device

Details Control arrangement for a hydraulically operated device Control arrangement for a hydraulically operated device

1979-02-02

1981-10-06

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91446, 91459, 91461, 13759616, 1375962, F15B 1108, F15B 13043

Patent

active

042928842

ABSTRACT:
A control arrangement for a hydraulically operated load lifting and lowering device includes precontrolled first valve means controlling flow of fluid from a source under pressure to a return conduit leading to a tank or to a working conduit leading to the device and a closer block in the working conduit, including a piston controlling flow of pressure fluid from the working conduit into the device, respectively flow of pressure fluid out of the device into the return conduit downstream of the piston. A throttle is arranged in the return conduit to produce upstream of the throttle a pressure acting on the piston but not on the slide of the first valve means, whereby without increasing the neutral fluid circulation pressure a uniform lowering of the load independent of the magnitude thereof may be obtained.

REFERENCES:
patent: 2495785 (1950-01-01), Stephens
patent: 3015316 (1962-01-01), Thomas
patent: 3411521 (1968-11-01), Johnson
patent: 3537259 (1970-11-01), Gordon et al.
patent: 3906838 (1975-09-01), Hofer
patent: 3980000 (1976-09-01), Iijima et al.

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