Valves and valve actuation – Biased trip – Electrical trip actuation
Patent
1987-04-13
1988-05-03
Nilson, Robert G.
Valves and valve actuation
Biased trip
Electrical trip actuation
251 69, 25112912, 185 40R, F16K 3104
Patent
active
047415088
ABSTRACT:
An actuator for a valve has an output shaft adapted to be connected directly to a rotary shaft of the body of a valve, the shaft being pivotally supported in a casing, a gear rotated in one direction only by a motor, an internal gear having outer peripheral teeth meshed with the first-mentioned gear, the internal gear being rotatable independently from the output shaft and pivotally supported thereby, a further gear meshed with the inner peripheral teeth of the internal gear and with a still further gear secured to the output shaft, a yet further gear for pivotally supporting the further gear at a shaft, the yet further gear being pivotally supported by the output shaft such that it is rotatable independently therefrom, a power spring to be wound by the rotation of the output shaft in the valve opening direction, and an electromagnetic device for preventing the yet further gear from being rotated while power is supplied, and permitting it to be rotated when power is shut off.
REFERENCES:
patent: Re30135 (1979-11-01), Fitzwater
patent: 3279744 (1966-10-01), Fieldsen
patent: 4595081 (1986-06-01), Parsons
patent: 4621789 (1986-11-01), Fukamachi
patent: 4669578 (1987-06-01), Fukamachi
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