Pump Control Valve (Implement, Steering)
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| 图 1 | g01799493 |
(1) 信号机油 (2) 调整螺丝 (3) 泵控制阀 (4) 压力补偿器弹簧（切断压力） (5) 至泵壳体的油流 (6) 至控制活塞的油流 (7) 来自泵输出端口的油流 (8) 压力补偿器滑阀（切断压力） (9) 流量补偿器滑阀（边缘压力） (10) 流量补偿器弹簧（边缘压力） (AA) 泵输出机油 (BB) 低控制机油压力 (EE) 信号压力 (LL) 液压油箱或箱体排油 | |
泵的控制阀 (3) 根据系统负荷和系统流量的需要，自动维持泵的压力和流量以满足要求。 在没有使用液压机具和转向回路时，泵则处在低压备用状态。 然而，如有一个或多个回路在用，信号决定阀就把机具控制阀的信号压力与转向信号压力进行比较。 把最高的决定信号通到泵的控制阀。 泵的控制阀 (3) 就此向泵发出信号，以维持需要的流量和压力。 边缘压力大约高于信号压力 2100 kPa (305 psi)。 泵的信号与泵的输出之间的差别就叫边缘压力。
如果低压备用低于 2660 kPa (380 psi) 或高于 4000 kPa (580 psi)，应检查边缘压力。 如果边缘压力超出技术规格，就调整边缘压力。
参考请参考测试和调整, "泵控制阀（机具、转向）- 测试和调整"部分。
泵的控制阀同时还有限制系统压力的功能，以防止过负荷。 如果系统压力快速上升，压力补偿装置就超越流量补偿的作用。 这就降低泵的输出流量。 这个动作从以下机具卸压阀的设定开始， 在破坏性高压出现时，其为液压系统提供保护。
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