The test method of pressure loss, flow loss and frictional force loss etc. of the hydraulic pumping units is presented, from which the mechanical efficiency and volumetric efficiency are obtained.
给出了测取液压抽油机系统压力损失、流量损失以及油缸的摩擦力损失等的方法，并由此求出系统的机械效率与容积效率。
This paper introduces the improving process of outside pour type hydraulic prop. It can reduce Labour strength, raise pressure text safety and work efficiency.
介绍了外注式单体液压支柱试压头的改造过程，对其进行改进可以降低劳动强度，提高试压安全性能和劳动效率。
The leakage of piston pairs has great influence on hydraulic pressure systems service behavior and operating efficiency.
活塞副的泄漏对液压系统的工作性能和工作效率有很大影响；
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