Function assist control for pressure relief valve

Details Function assist control for pressure relief valve Function assist control for pressure relief valve

1984-08-10

1986-02-25

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

251 61, F16K 31126

Patent

active

045722374

ABSTRACT:
A dual bellows apparatus for controlled, programmed application of forces to an extension of the spindle of a spring loaded safety relief valve. A controller which may be remote from the valve is adapted to perform a plurality of functions on the valve while installed in an operating system by pressurization of the respective bellows. These functions include force-assisted opening of the valve, force-assisted blowdown, anti-simmer control and measurement of the set pressure.

REFERENCES:
patent: 1229720 (1917-06-01), Ebeling
patent: 2675819 (1954-04-01), Eckman
patent: 2718896 (1955-09-01), Jones
patent: 2955612 (1960-10-01), Moser
patent: 3124147 (1964-03-01), Hallett
patent: 3548866 (1970-12-01), Kaiser
patent: 4349885 (1982-09-01), Thompson

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