Fire-safe valve actuator

Details Fire-safe valve actuator Fire-safe valve actuator

F - Mech Eng,Light,Heat,Weapons

16

K

251/18

F16K 31/44 (2006.01) F16K 51/00 (2006.01)

Patent

CA 1164844

ABSTRACT OF THE INVENTION A fire-safe valve actuator which cooperates with a bolted bonnet type valve to define a bolt chamber with an exterior shroud supporting the actuator housing and providing a substantially im- perfect barrier to prevent an external fire from coming into di- rect contact with the bolts or studs and nuts that connect the bonnet to the valve body. The bolt chamber may also be filled with an insulation material. The actuator may have a return spring con- nected to the actuator stem through a bearing so that the winding and unwinding of the spring does not result in any substantial torque being applied to the actuator stem. Similarly, any diaphragm in the actuator can be connected to the actuator stem by a bearing so that rotation of the stem will not impart torque to the dia- phragm. Furthermore, a stop can be provided limiting outward move- ment of the stem under the influence of the spring and by further providing a suitable sliding engagement between the diaphragm-actuator housing and the stem, the actuator housing and diaphragm can be readily removed from the balance of the actuator without bleeding the line pressure down.

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