Pilot operated relief valve

Details Pilot operated relief valve Pilot operated relief valve

F - Mech Eng,Light,Heat,Weapons

16

K

137/39.1

F16K 31/122 (2006.01) F16K 17/10 (2006.01)

Patent

CA 1176947

PILOT OPERATED RELIEF VALVE Abstract A pilot operated relief valve for use on medium and high pressure vessels, conduits, and the like. A two-stage, non-flowing valve (5) operates a main relief valve (7) of substantially greater capacity. Flow control elements provided by (35), (36), (38), and (39) associated with the first stage poppet are utilized to provide positive valve operation. In a preferred embodiment the main valve is mounted directly onto the pressure vessel which is to be vented at a predetermined pressure. The pilot is preferably mounted closely adjacent to and in fluid communication with the main valve. A flow adapter (100) having a self-cleaning orifice is disposed intermediate said main valve head volume (68) and pilot vent port (1) to provide improved operation of the combination. A ball (16) selector, (24, 15, 76) provides means for conveniently connecting to a field testing either the pilot or the entire valve, providing improved setpoint and reset or blowdown adjustments for the overall combination. A single stage proportional pilot valve (131) operates main valve (7) to provide pressure relief flow corresponding to the degree of over pressure (Ref. FIG. 16). A partially pressure balanced large diameter poppet (142), and reduced diameter seals 145b provide increased sensitivity to over pressure, improved setting accuracy, and poppet stability. A ball closure arrangement, (154) (158) acts to conserve test gas.

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