| 摘要 |
A valve assembly for an oil pumping system including a shell, a seat affixed in a lower end of the shell, a ball positioned within the shell and having a diameter greater than a diameter of the seat, and a cage positioned within the interior passageway of the shell. The cage has a first ported area and a second ported area on opposite sides of a ball retaining system. An elastomeric ring or a resilient member is positioned against a top of the cage.
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