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

049037277

ABSTRACT:
A hydraulically actuated safety valve includes two electromagnetically actuable pilot valves and is provided with two coaxial valve bodies movable in opposite direction towards each other. One of both pilot valves is designed as a proportional pressure differential valve and one of both valve bodies is provided with fine control notches. Thus, upon suitable actuation of the proportional pressure differential valve, the fine control notches clear a respective cross-section between the pump port and the working port and between the working port and the tank port to thereby allow a control of the speed and pressure buildup of a consumer such as e.g. a cylinder or a motor which is connected to the working port.

REFERENCES:
patent: 4473095 (1974-09-01), Motzer

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