The travelling valve of the pump is designed to be closed and opened forcibly, and the pump plunger adopts equal-diameter bare pipe with a floating structure to prevent gas lock and sand sticking.
这种抽油泵柱塞游动阀采用机械强制开启和关闭的结构，柱塞为等径光管、浮动结构，可防止发生气锁游动阀、阀球关闭滞后、砂卡柱塞现象。
Together with the practical application of the panel turnover gas-lock valve, the factors of the inherent character with the friction effect are also given in this paper.
结合生产实践分析了由于摩擦阻力而形成的翻板式锁气阀所固有的特性及其影响因素。
The rotating valve is connected respectively to four hydraulic lock through two throttling governors which are connected respectively with the four oil and gas springs.
转阀通过两个节流调整器分别与四个液压锁相通，该四个液压锁分别与相应的四个油气弹簧相连接。
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