Pilot operated relief valve

Details Pilot operated relief valve Pilot operated relief valve

1983-04-18

1983-10-18

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

138 44, F16K 3138

Patent

active

044100051

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.

REFERENCES:
patent: 3013583 (1961-12-01), Stanley
patent: 3771553 (1973-11-01), Huet
patent: 4200119 (1980-04-01), Cunningham

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