diameter of plunger
柱塞杠直径 D to dosing pole
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减小油泵柱塞直径对稳定性有好处；
Decreasing the piston diameter of the pump can improve the stability.
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当柱塞自由移动时，柱塞的外体直径刚好能够满足生产油管内径密封需求，提供最大的密封保障。
The outer-body diameter of the plunger is cut just under production tubing drift to provide the maximum seal while the plunger moves fr eely.
应用推荐
模块上移
模块下移
不移动