| 摘要 |
In a ball-type valve having a valve body and an annular seat therein for accommodating the ball, the improvement comprising adapting the seat whereby when the valve is in its open or closed position, the ball compresses the seat to seal the same against the valve body and at the same time tensions the seat to seal thereagainst. Also disclosed is a method of forming a seal between the body of a ball valve and the ball thereof, comprising the steps of providing a seat intermediate the body and the ball and moving the ball toward the body upon assembly of the valve whereby to compress a portion of the seat against the body and at the same time to tension a portion of the seat against the ball, thereby forming the seal between the body and the ball.
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