Safety valve for fluid systems

Details Safety valve for fluid systems Safety valve for fluid systems

1990-11-26

1991-11-26

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91 29, 91446, 91447, 91451, 91464, 137107, 13759616, 13759618, F15B 1304

Patent

active

050675192

ABSTRACT:
An improved safety valve includes piston-actuated provisions for gradually pressurizing a fluid-actuated motor during start-up of the system, preferably by way of a changeable flow restriction. In addition such improved safety valve preferably includes a floating exhaust valve actuating apparatus movable in an exhaust closure chamber and that operates in response to the presence or absence of line pressure in the exhaust closure chamber for respectively blocking off or opening fluid communication between the safety valve's outlet port and exhaust port. A pilot operator is also included for selectively permitting or cutting off line pressure flow to actuate the piston actuator and the exhaust valve actuating apparatus. The preferred safety valve also includes a check valve for preventing back-flow from the safety valve's outlet port back to the piston actuator and back to the exhaust valve actuating apparatus.

REFERENCES:
patent: Re30403 (1980-09-01), Bitonti
patent: 3741245 (1973-06-01), West
patent: 4561464 (1985-12-01), Frantz
patent: 4794951 (1989-01-01), Ryzner

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