力士乐先导式比例方向阀：R900731922 4WRKE25E350L-3X/6EG24EK31/A1D3M 现货供应

4WRKE 型阀门是二级比例方向阀。它们控制流动方向和流量。主级是受位置控制的，这样，控制阀芯位置在流量较大的情况下也不会受液动力的影响。

这种阀门主要由先导控制阀 (1)、壳体 (8)、主控制阀芯 (7)、盖（5 和 6）、对中弹簧 (4)、感应式位置传感器 (9) 和减压阀 (3) 组成。如果没有输入信号，则主控制阀芯 (7) 就会被对中弹簧 (4) 固定在中心位置。盖（5 和 6）中的两个控制腔通过控制阀芯 (2) 连接到油箱。主控制阀芯 (7) 通过感应式位置传感器 (9) 连接到合适的控制电子元件。主控制阀芯 (7) 的位置改变和放大器求和点控制值的改变，都能产生差动电压。比较控制值和理论值期间，通过电子元件确定可能的控制偏差，并向先导控制阀 (1) 的比例电磁铁施加电流。电流会在线圈中产生不断通过推杆来操作控制阀芯的力。通过控制剖面激活的流量会导致主控制阀芯的调整。连接了感应式位置传感器 (9) 内核的主控制阀芯 (7) 会一直移动，直到理论值与控制值相符。在控制状态下，主控制阀芯 (7) 处于力平衡状态并停留在该控制位置。控制阀芯行程和控制开口与控制值成比例改变。控制电子元件集成到阀门中。通过对阀门和电子元件进行调节，可以将批量生产设备导致的偏差保持在较低水平。

不得让油箱管路排空运行；在相应的安装条件下，必须安装一个预载阀（预载压力约为 2 bar）。

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