Working conditions of plunger in water hydraulic plunger pump is quite adverse, and its material needs rather high requirements on strength and wearability.

水液压柱塞泵的柱塞工况非常恶劣，对材料的强度和耐磨性都有较高要求。

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In addition, this kind of hydraulic pumping unit will be simple and convenient to machine, operate and maintain, because the double-acting hydraulic cylinder will be replaced by a plunger cylinder.

此外，用柱塞缸取代双作用液压油缸，使这种液压抽油机具有加工简单、成本低、维护和使用方便等优点。

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This paper introduces briefly the structure, hydraulic system and control principle of a testing twin plunger hydraulic evelator.

本文对双缸液压电梯的结构形式、液压系统和控制原理作了简要分析。

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Lufkin will add a variety of other technologies including rod lift, gas lift, plunger lift, hydraulic lift and progressive cavity pumps, to this.

FORBES: GE's Bet On Lufkin Bolsters Its Growing Energy Business