Fail-safe valve actuator

Details Fail-safe valve actuator Fail-safe valve actuator

F - Mech Eng,Light,Heat,Weapons

16

K

251/13

F16K 31/122 (2006.01) F16K 31/143 (2006.01)

Patent

CA 1266853

ABSTRACT OF THE DISCLOSURE A fail-safe valve actuator includes a hydraulic piston (17) and cylinder (15) for driving the valve stem (9) and gate member (35) of a gate valve into a first flow control state res- ponsive to sufficient pressure delivered by a fluid or gas supply line (92). Upon failure or other loss of sufficient control line pressure, a volute spring (7) drives the cylinder (15), and hence the stem (9) and gate member (35), axially outward resulting in the valve being moved into a second flow control state. Retain- ing rings (94, 102) are provided to retain the volute spring in a precompressed state during disassembly of the actuator for servicing.

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