石油开采过程中，抽油泵凡尔罩故障性断脱的频繁发生，不仅加大了采油作业工作量，增加了采油成本，同时也严重影响了原油产量。
In the process of oil production, frequent dropout of pump's valve cover may not only increase work load of production operation and cost of production, but also heavily influence oil output.
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。
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.
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