Patent ID: 6345805
Filing Date: 2002-02-12
Classification: F16K,Y10T

Abstract:
An assembly for a rotary plug valve for controlling a line pressure, a valve body for said rotary plug valve having a valve chamber therein, first and second passages extending through said valve body and being in communication with said valve chamber to define a flow passage through said valve body, said valve body having a recess surrounding said flow passage adjacent to said valve chamber, a rotatable valve stem disposed in said valve body, said rotatable stem having a stem axis, said assembly comprising:a cylindrical plug mounted in said valve chamber for controlling flow through said valve body, said cylindrical plug having a curved plug seal surface; a telescoping seat assembly in each of said recesses, each said telescoping seat assembly including, a first seat element defining a curved seat seal surface for engaging said curved plug seal surface; and a second seat element for engaging and sealing with said recess, said first seat element and said second seat element being relatively moveable with respect to each other, said cylindrical plug being connected with said valve stem, said cylindrical plug being mounted within said valve chamber of said valve body so as to be moveable transversely to said stem axis in response to line pressure acting on said cylindrical plug when said cylindrical plug is rotated to a closed position.