ROTARY SHEAR VALVE WITH THREE-POINT STATOR SEATING

摘要

A rotary shear valve having three-point stator seating is provided. Three contact points are predetermined between a bottom of the stator and a valve body rim and three clamping pads may also be predetermined. The three clamping pads and the three points of contact between stator and the valve body rim are corresponding and aligned when the rotary shear valve is assembled so that the clamping or compression forces on both sides of the stator directly oppose one another, thereby effectively canceling each other. In one embodiment, the stator includes three contact points on the bottom surface proximate the periphery of the stator to contact the valve rim and a gasket includes three clamping pads proximate the periphery of the gasket web to apply a compression force on the top surface of the stator above the three contact points.

主权项

1. A rotary shear valve comprising:
a valve body comprising a motor mount end and a manifold mount end, and a cavity extending between the motor mount end and the manifold mount end; a valve body rim in the cavity; a disc-shaped rotor rotatably mounted in the valve body, the rotor comprising:
one or more slots in a top surface; anda rotor sealing face on the top surface; a disc-shaped stator mounted in the valve body, the stator comprising:
a top surface and a bottom surface;one or more ports extending between the top surface and the bottom surface;a stator sealing face on the bottom surface, wherein the stator sealing face is in sliding and sealing contact with the rotor sealing face; andan annular recess in an outer periphery of the bottom surface of the stator; and three predefined contact points defined between the stator annular recess and the valve body rim, wherein the stator only contacts the valve body rim at the three contact points.