Safety valve assembly

Details Safety valve assembly Safety valve assembly

1987-03-17

1988-06-07

Garrett, Robert E.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91461, 13759614, 13759616, F15B 1108

Patent

active

047488964

ABSTRACT:
A safety valve assembly for regulating the flow of a fluid under pressure to a fluid operated system e.g. a double acting cylinder element includes a housing with an inlet port, outlet ports and working ports and accommodating a pair of parallel valve spindles which are controllable by respective pilot valves so as to be shiftable between two valve positions. Each valve spindle is provided with a working piston, valve piston and a control piston which cooperates with a respective valve seat as defined by the housing. The control pistons of the valve spindles are successively disposed in a passageway extending between one of the working ports and one of the outlet ports.

REFERENCES:
patent: Re31161 (1983-03-01), Mahorney
patent: 3265089 (1966-08-01), Nill
patent: 4083381 (1978-04-01), McClocklin et al.
patent: 4257455 (1981-03-01), Cameron
patent: 4353392 (1982-10-01), Ruchser et al.
patent: 4542767 (1985-12-01), Thornton et al.

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