在没有可用的样本时，外部流量开关将会抑制泵输出流量。
External flow switch inhibits pump output when no sample flow is available.
并联系统中，当一台液压泵向一组执行元件供油时，进入各执行元件的流量只是液压泵输出流量的一部分。
Parallel system, when a hydraulic oil supply to the actuator when a group entered the implementation of the components of the flow is only part of the hydraulic pump output flow.
采用恒压变量柱塞泵，输出压力保持恒定，输出流量根据系统需要而变化。
Using constant pressure variables plunger pump, output pressure can keep constant and flow varies as per system's demand.
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