The utility model can efficiently prevent air locking phenomena and the eccentric wear of the plunger, increase the production quantity of raw oil and extend the service life of the oil well pump.
本实用新型可有效地防止“气锁”和柱塞偏磨，提高原油产量和抽油泵的使用寿命。
The utility model can efficiently prevent air locking phenomena and the eccentric wear of the plunger, increase the production quantity of raw oil and extend the service life of the oil well pump.
本实用新型可有效地防止“气锁”和柱塞偏磨，提高原油产量和抽油泵的使用寿命。
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