Valve actuator with emergency shutdown feature

Details Valve actuator with emergency shutdown feature Valve actuator with emergency shutdown feature

1999-02-11

2000-11-28

Hepperle, Stephen M.

Fluid handling

Line condition change responsive valves

Safety cut-off requiring reset

137463, F16K 1700

Patent

active

061521671

ABSTRACT:
A valve actuator with an emergency shutdown feature incorporates shutdown of the valve when a sensed line pressure is outside of high- and low-pressure trip points. The actuator can be manually tripped. The actuator can be tripped in the event of a fire or, incorporating a solenoid, a trip can be accomplished with an appropriate signal. Once tripped, the actuator requires manual reset. The normal open and closed operation of the valve cooperates with a clutching mechanism which is part of the trip system. The preferred embodiment of the clutching system is a torsion spring or springs which normally allow movement in one direction but not in the other unless acted upon by the tripping system.

REFERENCES:
patent: 331544 (1885-12-01), Reinecke
patent: 1466945 (1923-09-01), Bendix
patent: 1784094 (1930-12-01), Fletcher
patent: 2327980 (1943-08-01), Bryant
patent: 2733729 (1956-02-01), Wolfe
patent: 2930571 (1960-03-01), Vogl
patent: 5261446 (1993-11-01), Baker
Guiberson AVA Dresser, Model `SRM` Safely Release Manual Actuator, 5 pages, date unknown.
Baker Oil Tools, Maintenance and Operating Instructions for Model "CSWC" Coil Spring, High Thrust Wire-Cutting Actuator, 6 pages, Nov. 5, 1993.
Otis Engineering Corporation, Guide to Otis Surface Safety Valve Actuators and Accessories, 1 page, Feb. 1993.
Axelson, Axelson Type HC Actuator, 2 pages, date unknown.
Baker Oil Tools, Pneumatic and Hydraulic Actuator drawings, 5 pages.

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