Fail safe valve actuator

Details Fail safe valve actuator Fail safe valve actuator

1991-03-28

1993-03-23

Rosenthal, Arnold

Valves and valve actuation

Electrically actuated valve

Rotary electric actuator

192 56R, 192 81C, 192 56C, 744248VA, 464 30, 464 40, F16K 3104, F16D 702, F16D 4320

Patent

active

051957213

ABSTRACT:
A fail safe valve actuator is disclosed that is powered by an electric motor. A valve stem with a helical groove is moved in one direction by a ball nut rotated by the electric motor to move a valve member to its operating position. The valve member is held in operating position by a solenoid. When power fails, a spring moves the valve stem in the other direction to move the valve member to its fail safe position. A torque limiting device protects the electric motor from the high torque created when the valve stem abruptly stops moving when the valve member reaches its operating position. A centrifugal brake absorbs a portion of the energy released when the power fails and the valve stem is moved rapidly to its fail safe position by the spring.

REFERENCES:
patent: 2930571 (1960-03-01), Vogl
patent: 4273307 (1981-06-01), Malinski et al.
patent: 4502269 (1984-11-01), Travenol
patent: 4660428 (1987-04-01), Payne
patent: 4741508 (1988-05-01), Fukamachi
U.K. Patent Office Examiner's Search Report (Apr. 23, 1992) in Applicant's corresponding U. K. Application No. 9107939.2.

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