Safety valve

Details Safety valve Safety valve

1989-04-26

1990-02-27

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91424, 13759618, F15B 13043

Patent

active

049037293

ABSTRACT:
A hydraulic safety valve which is controlled by two electromagnetically actuatable pilot valves is provided with two valve bodies movable in opposite direction towards each other and including control pistons for regulating the connection between one pump port, two working ports and two tank ports. Upon occurrence of a faulty switching, the valve bodies move into a hydraulically locked end position. One of both pilot valves is designed as a proportional pressure differential valve and the control pistons associated therewith are provided with fine control notches so that the valve can be proportionally controlled to thereby allow a control of the pressure buildup, the speed and direction of motion of a consumer which is connected to the valve.

REFERENCES:
patent: 4473095 (1984-09-01), Motzer

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