It has been proved in experiments that these methods not only improve the efficiency of the hydraulic system, but also the controllability of excavator.

试验证明，这些措施的采用，不仅提高了液压系统效率，而且使挖掘机的操纵性得到明显提高。

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The hydraulic fluid viscosity, the volumetric efficiency and the hydraulic system working efficiency drops, divulging increases, even causes the mechanical device to be unable the normal work.

液压油黏度、容积效率和液压系统工作效率均下降，泄漏增加，甚至使机械设备无法正常工作。

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The optimal hydraulic design can effectively improve the outlet flow pattern of suction box to ensure better flow conditions for pump and raise the efficiency of pumping system substantially.

进水流道水力设计优化可有效地改善进水流道出口流态，确保水泵有良好的进水条件，大幅度提高水泵装置效率。

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