油研柱塞泵是一种往复泵，归于体积泵，其柱塞靠泵轴的偏疼滚动驱动，往复运动，其吸入和排出阀都是单向阀。当柱塞外拉时，作业室内压力下降，出口阀封闭，低于进口压力时，进口阀翻开，液体进入；柱塞内推时，作业室压力升高，进口阀封闭，高于出口压力时，出口阀翻开，液体排出。
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