Back to results
US 4,379,543 AGranted
Vane type valve actuator
AssigneeValinco, Inc.
InventorV. Randon Reaves
Life of this patent
Estimating the term…
Abstract
In the preferred and illustrated embodiment of a valve actuator, a vane type fail safe actuator is disclosed. The actuator comprises a housing enclosing a vane which is integral with a shaft extending through the housing to a rotary operable valve. Fail safe operation is provided by a spring return mechanism connected to the housing. Compressed air is utilized to operate the actuator and the spring return mechanism which assures complete valve closure when the air supply fails or is reduced below a predetermined minimum setting.
Claims6
A valve actuator, comprising:
- (a) a housing sealingly enclosing a vane connected to a valve via a shaft rotated by said vane;
- (b) means for moving said vane in said housing to a valve open position;
- (c) a movable piston and return spring enclosed by a piston housing fixedly secured to said vane housing, said piston joined to an elongate rod wherein one end of said rod protrudes through an opening in said vane housing to contact said vane;
- (d) said elongate rod including a cylindrical cross-bar perpendicularly extending from said one end of said rod, said cross-bar providing a bearing surface for a bearing means to enable rolling contact with said vane.
1 more element
Dependencies are inferred from the claim text.