The kind of pump improves greatly the control efficient and control accuracy and simply the design of hydraulic system with proportional regulation and save the energy of hydraulic systems.

应用这种泵可大大提高液压系统控制效率、控制精度，简化了比例调节液压系统的设计，并使液压系统具有节能的功效。

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There are many factors that influence impact and vibration in hydraulic systems, such as pump structure, valve parameters, load, pipe design and operation conditions.

影响液压系统冲击、振动的因素很多，如泵的结构、阀的参数及负载情况和整个系统管路设计的合理性、工作条件等。

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A mathematical model of water hammer arrester with the lower open type in calculating the hydraulic transient in the pump systems is established.

建立了下开式水锤消除器在泵系统水力过渡过程计算中的数学模型。

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