Fluid-Actuated Butterfly Valve

摘要

The subject matter of this specification can be embodied in, among other things, a valve assembly that includes a valve body having a fluid inlet, fluid outlet, and a movable closure member adapted to block fluid flow from the inlet to the outlet through a housing. The housing has an opening adapted to receive an actuator assembly that includes a central stationary shaft having at least one stator vane. A rotating collar is disposed around the stator vane and a portion of the central stationary shaft. The rotating collar has a housing and at least one stop member disposed inwardly in a cavity of the rotating collar. The rotating collar has at least two actuation chambers defined by the inner wall of the cavity in the rotating collar, the stationary vane, and the stop member. The rotating collar is coupled to the movable valve closure member.

主权项

1. A valve assembly comprising:
a valve body including a fluid inlet and fluid outlet and movable closure member disposed in a housing, said closure member adapted to substantially block fluid flow from the inlet to the outlet; said housing further having an opening adapted to receive an actuator assembly; said actuator assembly comprising:
a central stationary shaft disposed in the valve body, said shaft having at least one stator vane member affixed to the central stationary shaft; anda rotating collar assembly disposed around the stator vane member and a portion of the central stationary shaft, said rotating collar assembly having a housing adapted to be received in the valve body, said rotating collar assembly having at least one stop member disposed inwardly in an inner cavity of the rotating collar assembly, the stop member adapted to contact the stator vane member when the rotary collar assembly is rotated around the central shaft assembly in a first direction and adapted to contact the vane member when the rotary collar assembly is rotated in the opposite direction, said rotating collar having at least two actuation chambers defined by a portion of the inner wall of the cavity in the rotating collar assembly, the stationary vane member, and the stop member; wherein said rotating collar assembly is coupled to the movable valve closure member.