Fail-safe actuator for rotary valves

Details Fail-safe actuator for rotary valves Fail-safe actuator for rotary valves

F - Mech Eng,Light,Heat,Weapons

16

K

251/18, 137/4.3

F16K 31/44 (2006.01) F16K 17/38 (2006.01) F16K 31/05 (2006.01)

Patent

CA 1223855

ABSTRACT OF THE DISCLOSURE An actuator for a rotary valve includes a fail-safe mechanism for automatically opening or closing the valve upon the occurrence of a predetermined condition. The actuator also includes a mechanism for permitting the manual operation of the valve from the open to closed position, and vice versa, and to a continuum of positions between the open and closed positions even when the fail-safe mechanism is activated. A biased clutch activates the fail-safe mechanism and also couples a worm-gear drive for effecting the manual operation of the valve.

446993

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