Autonomous assistance device for a safety valve

Details Autonomous assistance device for a safety valve Autonomous assistance device for a safety valve

1985-05-14

1987-06-09

Garrett, Robert E.

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

137488, 25112915, F16K 1700

Patent

active

046713190

ABSTRACT:
Autonomous assistance device for a safety valve protecting a vessel under pressure and comprising a hollow body (13), a seat cooperating with a movable closure member fixed to a rod (9), and a calibrated spring (7) bearing against the rod (9) and against the valve body (13) to hold the closure member against the seat. The closure member rod (9) is extended into a casing (19) fastened to the body (13) and receives the additional thrust of a spring (51). The casing (19) constitutes in addition a pneumatic ram whose piston (53) can apply to the rod (9) a thrust opposite to and greater than that of the spring (51). The device feeding the ram (19) comprises an autonomous reservoir (33), a three-way solenoid valve (24) for feeding the ram or connecting it to atmosphere, and a manometer contact (39) mounted on the wall of the pressure vessel and adjusted to close the solenoid valve supply circuit when the pressure in the vessel reaches the adjusted pressure.

REFERENCES:
patent: 862867 (1907-08-01), Eggleston
patent: 2059635 (1936-11-01), Fillo
patent: 2422819 (1947-06-01), Becker
patent: 3308846 (1967-03-01), Yuile
patent: 3865132 (1975-02-01), Wiegand
patent: 4043533 (1977-08-01), Cowley
patent: 4129141 (1978-12-01), Vogeli
patent: 4143851 (1979-03-01), Lange
patent: 4240463 (1980-12-01), Moore
patent: 4249556 (1981-02-01), Waletzko
patent: 4320779 (1982-03-01), Peters
Pneumatic Valve Positioners, by James B. Madison.

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