Pilot-operated relief valve

Details Pilot-operated relief valve Pilot-operated relief valve

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 31/122 (2006.01) F16K 17/04 (2006.01) F17C 13/04 (2006.01) G05D 16/16 (2006.01)

Patent

CA 2323857

A pilot operator and a relief valve are provided in the same housing. The pilot--operating mechanism is contained partially within the main closure element of the valve and partially within the valve cap. Inlet pressure to the valve is communicated to the pilot via an access passage extending through the main closure element. In response to high-pressure flow from the inlet, a pilot piston moves a spacer rod through the passage and into engagement with a spring-loaded vent closure. The piston-induced movement of the rod opens the vent to relieve the pressure behind the main closure element, which in turn permits the main closure element to open and relieve the inlet pressure through the valve outlet. Opening of the main closure element terminates flow through the access passage. When the inlet pressure is sufficiently reduced, the pilot piston is unseated by the spring force re-opening the access passage to allow the pressure behind the main closure element to increase and close the main closure element. A back-flow- prevention assembly carried in the main closure element prevents reverse flow of fluids from the outlet to the inlet when the outlet pressure exceeds the inlet pressure.

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