| 摘要 |
<p>A ball valve assembly comprises a valve body having an inlet port, a passageway therebetween for transmitting fluid from the inlet port to the outlet port, and at least one of an open valve hydraulic port and a closed valve hydraulic port; a ball within the valve body having a through port therein and a spherical exterior surface, the ball being positioned within the valve body for rotation between an open position and a closed position; a seat ring 30 within the valve body for sealing engagement with the spherical exterior surface of the ball when the ball is in the closed position and fluid pressure is upstream of the ball; a support ring 40 for engaging the exterior surface of the ball when the ball is in the closed position and supporting the ball when fluid pressure is upstream of the ball; an actuator sleeve surrounding the ball and axially moveable with respect to the valve body for rotating the ball between the open position and the closed position; the ball being formed from a high strength material; a ball engaging ring 44 of the support ring being formed from a high strength material, and the seat ring 30 being formed from a low strength material.</p> |
