| 摘要 |
An open type cage, having exterior threads and three equally spaced slots, which locates and contains the stationary or standing ball and seat check valve, and connects to standardized, stationary barrel, top or bottom anchored, rod insert pumps that are commonly used for crude oil production. This cage allows for the placement of a standard sized, flat type, ball and seat at the very end of the pump barrel or extension coupling, or up inside of the same. This positioning allows the upper travelling valve to sweep as close as possible to the lower standing valve when the plunger is at the bottom of its stroke. This reduces the unswept volume and increases the pumps compression ratio. This cage has two slightly different configurations that is determined by the bore size of the pump for which it is designed, but both variations use standard valve sizes and threaded connections.
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