双头螺杆泵比单头螺杆泵工作腔室多，泄漏少，泵的排量大，效率高。

The twin screw pump is of the properties of less leakage, big displacement and effectivity.

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这种系统不是靠改变泵的排量而是靠改变泵的转速来改变其输出流量，从而实现对液压系统的控制。

This hydraulic system is controlled by different pump's flux, which is realized by changing the speed of pump, instead of changing pump's displacement.

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变量泵仅运行在第一和第二泵排量位置中的一个位置上。

The variable displacement pump operates in only one of the first and second pump displacement settings.

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