气体管道增压泵有单作用泵和双作用泵。
Gas pipelines have a single role of booster pumps and pump dual role.
针对以上要求，目前广泛使用的是三缸单作用往复泵（简称三缸泵）。
Now, the drilling pump widespread in use is the tri-cylinder pump.
单作用叶片泵径向不平衡力是影响其工作压力提高的主要问题。
The imbalance of the radial force of the single action vane pump is a main problem which affects the enhancement of the working pressure.
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