News

Ball valve seat arrangement

Ball valves that include a gland that is interposed between a spring and a seat. The ball valves include a valve body, a ball, a valve seat, and an annular spring. The spring urges the gland member toward the valve seat to urge the valve seat toward the ball. A ball valve comprising: a valve body having a valve chamber, an inlet passage, and an outlet passage; a ball including a flow opening, the ball being mounted in the chamber such that the valve is moveable along an axis defined by the valve chamber and such that that the ball is rotateable in the valve chamber between valve open and closed positions to control fluid flow through the valve; a valve seat disposed in the valve body having a seal surface in sealing engagement with the ball such that the valve seat is moved along said axis when said ball is moved, wherein the valve seat further comprises a planar end surface that is axially spaced apart from the seal surface; a rigid single piece gland member having an outer end surface, a cylindrical outer major surface that extends axially inward from the outer end surface, an axially innermost end surface having a circumferential edge, a cylindrical outer minor surface having a diameter that is smaller than a diameter of said cylindrical outer major surface and that extends axially inward from the circumferential edge of the innermost end surface, and an annular shoulder surface that extends between said outer major surface and said outer minor surface, wherein said circumferential edge of said axially innermost end surface is disposed in the valve body such that the outer circumferential edge of said axially innermost end surface of the gland member directly engages a planar end surface of the valve seat and the gland member is moved along said axis when said ball is moved; an annular disc spring disposed in the valve body in engagement with the gland member such that the disc spring urges the gland member toward the valve seat to urge the valve seat toward the ball. The present application relates to ball valves that include a gland that is interposed between a spring and a seat. One such ball valve includes a valve body, a ball, a valve seat, and a disc spring. The valve body includes a valve chamber, an inlet passage, and an outlet passage. The ball is mounted in the chamber such that the valve is moveable along an axis of the valve chamber and such that that the ball is rotateable in the valve chamber between valve open and closed positions. The valve seat is disposed in the valve body in sealing engagement with the ball such that the valve seat is moved along the axis when the ball is moved. The gland member is disposed in the valve body in engagement with the valve seat such that the gland member is moved along the axis when the ball is moved. The spring is disposed in the valve body in engagement with the gland member. The spring urges the gland member toward the valve seat to urge the valve seat toward the ball. In operation, the spring applies a biasing force to the gland. The ball valve housing guides movement of the gland. The biasing force is transferred from the gland to the seat. The housing guides movement of the seat to maintain engagement between the seat and the ball.

                                                                                       Shanghai Remy Valve Manufacturing Co., Ltd.

2011-12-27 05:02

Back