Pilot operated relief valve

Details Pilot operated relief valve Pilot operated relief valve

1981-02-17

1983-06-28

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

137492, 137102, F16K 3112

Patent

active

043900410

ABSTRACT:
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 operates a main relief valve of substantially greater capacity. In a preferred embodiment 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 particularly unique ball selector provides means for testing both first and second stages without operating the main valve, providing improved setpoint and reset or blowdown adjustments for the overall combination.

REFERENCES:
patent: 3110468 (1963-11-01), Herion
patent: 3272218 (1966-09-01), Johnson
patent: 3294111 (1966-12-01), Abercrombie
patent: 3414008 (1968-12-01), Greenwood
patent: 3512549 (1970-05-01), Wiegand
patent: 3664362 (1972-05-01), Weise
patent: 3754566 (1973-08-01), Gemigniani

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