Pilot operated pressure and vacuum relief valve

Details Pilot operated pressure and vacuum relief valve Pilot operated pressure and vacuum relief valve

1975-12-01

1977-04-12

Cohen, Irwin C.

Fluid handling

Line condition change responsive valves

Bi-directional flow valves

1374936, 1374939, F16K 1726

Patent

active

040169030

ABSTRACT:
A pilot operated pressure and vacuum relief valve which is adapted to open both at times when fluid pressure in a system in which the valve is connected exceeds a predetermined high value and at times when such pressure falls below a predetermined lower value.
Said valve comprises a housing, a first valve means slidably inserted in said housing, a second valve means slidably inserted in said first valve means, a regulating member inserted in said first and second valve means, extending from the front end portion to rear end portion of said first valve means, and first and second springs disposed in said housing and said first valve means located and constructed so as to bias said first valve means and said second valve means respectively.

REFERENCES:
patent: 2501730 (1950-03-01), McClure
patent: 3100503 (1963-08-01), Tennis
patent: 3112763 (1963-12-01), Tennis et al.

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