Pilot operated relief valve

F - Mech Eng,Light,Heat,Weapons – 16 – K

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137/39

F16K 31/122 (2006.01) F16K 17/02 (2006.01) F16K 17/10 (2006.01) G05D 16/16 (2006.01)

Patent

CA 1159337

Abstract Pilot Operated Relief Valve A pilot operated relief valve for use on medium and high pressure vessels, conduits, and the like. A unique two-stage, non-flowing pilot 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 oper- ation. 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 the main valve for operating communication therewith. 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.

386887

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