(5)防止管路压力丢失过大致使恒功率变量泵输出流量达不到估计需求，恒功率变量泵的出口经单向阀和换向阀等与液压缸相连，液压缸的回油也须经相应的阀流到油箱。假如有的阀标准偏小，形成压力丢失偏大，则会使泵的输出流量过小，达不到液压缸疾速动作的需求。 (5)防止管路压力丢失过大致使恒功率变量泵输出流量达不到估计需求，恒功率变量泵的出口经单向阀和换向阀等与液压缸相连，液压缸的回油也须经相应的阀流到油箱。假如有的阀标准偏小，形成压力丢失偏大，则会使泵的输出流量过小，达不到液压缸疾速动作的需求。
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