Clutch for valve actuator

Details Clutch for valve actuator Clutch for valve actuator

1978-09-18

1981-06-16

Herrmann, Allan D.

Valves and valve actuation

Biased trip

Electrical trip actuation

185 40R, 192 26, 192 81C, 192 84T, F16D 1308, F03G 100

Patent

active

042733073

ABSTRACT:
A valve actuator utilizing a drive motor and a stored energy device to operate valves primarily in safety related applications is disclosed. The actuator operates on signal or loss of power to return a driven valve to a predetermined position. The actuator in particular utilizes unidirectional coupling between a driven shaft and an output shaft that is coupled to the driven valve. Specifically, the coupling utilizes a coiled spring having a unique diametral relationship with the driven shaft in order to insure reliable actuation and control of shaft wear. A fluid dampened device or dashpot is also utilized to provide controlled operation during the return cycle that is powered by the stored energy device.

REFERENCES:
patent: 2883022 (1959-04-01), Clausing et al.
patent: 2930463 (1960-03-01), Dodge et al.
patent: 3110192 (1963-11-01), Hood
patent: 3216392 (1965-11-01), Shimanckas
patent: 3808895 (1974-05-01), Fitzwater
patent: 3850275 (1974-11-01), Helander
patent: 3934690 (1976-01-01), Janning
patent: 4090589 (1978-05-01), Fitzwater

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