Safety valve for fluid systems

Details Safety valve for fluid systems Safety valve for fluid systems

F - Mech Eng,Light,Heat,Weapons

15

B

F15B 13/02 (2006.01) F15B 11/068 (2006.01)

Patent

CA 2046431

SAFETY VALVE FOR FLUID SYSTEMS ABSTRACT OF THE DISCLOSURE 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.

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