| 摘要 |
There is provided a seat assembly for use in a downhole oil pump ball valve. The assembly includes a seat, a seat rest, and a ball. The seat is used for seating the ball of the ball valve. The seat has an outer wall and a top surface and a curved shoulder surface between the outer wall and the top surface. The seat rest receives the seat, and the seat rest has a curved corner surface so that when the seat is assembled with the seat rest the seat and seat rest are in substantial contact at all points of the curved shoulder surface and the curved corner surface.
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