根据不同的工作压力和工作环境，在液压系统中选用不同型号液压泵，可以提高液压系统的工作效率和稳定性，节省能量，提高产品质量和产品竞争力此外，液压回流泵是一种新型节能产品由于回流泵体积小、重量轻，而效率高，因而能广泛用于各种流体工程机械中。
这类泵的结构简单：油封和泵内均为一体成型的金属材料制成（根据材质不同分为铸造精密泵、玻璃钢精密泵等）这样不但可以减少油封的损坏，而且由于流体工程机械中泵内的压力表处于真空状态，泵内无气，泵内介质较少，相对地减小了体积和重量；油泵有真空泵、真空流量调整装置和真空辅助装置等部件；另外由于液体是静止的和流动的，不需要润滑，因此在设计、制造时都很省油。
低噪声，无污染，有良好的耐温性能，并能改善电机的运行特性，可在苛刻条件下工作噪音极小，不会污染工作环境效率高流量能控制在标准规格范围内低功耗运行平稳 由于油泵的输入油量与出口油量一致，因此可根据用户需要灵活地调节其流量。
这种泵的主要特点是，对压力调节范围较大，且不受流量限制，且不需要对设备进行改造如无液流量监测系统或仪表装置，压力过高时只能调整油压；压力过低时则又需增加液量泵的主要结构是：用弹簧来保持动平衡以防止振动；泵腔里有若干个工作腔。
活塞在运动中产生着巨大的推力并将其作用于气缸壁而产生着反作用力当活塞受到径向力时就会有一部分被吸进气缸内，另一部分又通过一个工作腔继续运动，所以活塞向外产生着作用力；活塞在缸盖内运动时，其行程相当于泵的输出量（流量）的百分比。
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