| 摘要 |
An improved travelling valve, which provides improved qualities of wear resistance, efficiency, and gas lock prevention. the improved travelling valve has a ball which is positioned on a seal stem, so that the ball is reliably centered when seated on the valve seat, reducing damage to the ball and seat from improper seating and providing increased efficiency for deviated or non- vertical pumping operations and the pumping of highly viscous fluids such as heavy crude. Tn the preferred embodiment, the improved travelling valve is constructed so that a lower portion or the valve rotates during pumping, and thereby imparts rotational movement to the fluid passed therethrough. Such rotational movement of the valve and fluid helps reduce gas lock, and reduces damage to the ball, seat, and valve exterior from impurities in the pumped fluid. Preferably, rotational movement is caused by angled channels in an interior portion of a vein rotator positioned at the bottom of the travelling valve, working in combination with angled channels in the seal stem.
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