Pilot operated relief valve

Details Pilot operated relief valve Pilot operated relief valve

1980-09-30

1982-10-26

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

137469, 137102, F16K 31122

Patent

active

043556574

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 (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 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.

REFERENCES:
patent: 1690097 (1928-11-01), Ackermann
patent: 2644480 (1953-07-01), Earle
patent: 3074425 (1963-01-01), Kikendall
patent: 3568706 (1971-03-01), Weise
patent: 3605793 (1971-09-01), Kinsel
patent: 3702141 (1971-11-01), Wetterhorn
patent: 3726301 (1973-04-01), Schmidt
patent: 3754566 (1973-08-01), Gemigniani
patent: 4172466 (1977-07-01), Pattarini

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