Pump Control Valve
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| 图 1 | g00111596 |
(1) 信号油 (2) 调整螺丝 (3) 泵控制阀 (4) 压力补偿弹簧(断开压力) (5) 油流到泵壳 (6) 油流到控制活塞 (7) 油从泵的出口流出 (8) 压力补偿卷轴(断开压力) (9) 流量补偿卷轴(压差) (10) 流量补偿弹簧(压差) (AA) 泵输出油 (BB) 低控油压 (EE) 信号压力 (LL) 液压油箱或壳体排放油 | |
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。 压差大约是2100 kPa (305 psi)， 高于信号压力。 泵的信号与泵的输出之间的差别就叫压差。
如果低压备用低于2660 kPa (380 psi) 或高于 4000 kPa (580 psi)，就需要检查压差。 如果压差超出技术规格，就调整压差。 参阅测试和调整, "泵的控制阀(液压转向) – 测试和调整"章节。
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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