| 摘要 |
A ball valve having a body with an inlet, an outlet and a cavity containing a ball with a spherical flow passage between the inlet and the outlet. A ring supported on the body concentric to the inlet and the outlet. A seat surface is supported on the ring between an outer transition surface, an inner transition surface and concentric to the inlet. The seat surface is engaged by the ball member. The inner transition surface and the outer transition surface are each inclined to the seat surface at a shallow angle. A flow passage extends through the spherical surface of the ball at a sharp edge that moves across the transition surface adjacent the seat surface to the seat surface as the ball moves from an open to a closed position. The sides of the ball each have a recess extending through the spherical surface at a sharp edge whereby a cleaning action on the seat results during opening and closing of the spherical surface.
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