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力士乐REXROTH四通型号的方向伺服阀
4WS.2E...
规格 10
组件系列 5X
*大工作压力 315 bar
*大流量 180 l/min
用于控制位置、力、压力或速率的阀
带机械反馈或机械和电气反馈的二级伺服阀
第 1 级喷嘴/挡板放大器
用于底板安装：孔图按 ISO 4401
干燥的控制电机，液压液不得弄脏电磁铁间隙
也用作 3 通结构
无磨损控制阀芯复位元件
在外部控制或通过集成电子元件 (OBE) 控制
阀和集成控制电子元件已进行调节和测试
带液动力补偿的控制阀芯
中心固定的控制阀套，因此对温度和压力的敏感性很低
控制阀套上的压力腔带有间隙密封，因此无密封圈磨损
第 1 级的过滤器可从外部自由检修
产品说明
4WS(E)2EM10-5X/...
4WS(E)2EM10-5X 型阀门是电动操作的 2 级伺服方向阀。它们主要用于控制位置、力和速率。
这些阀门由机电转换器（力矩马达）、液压放大器（原理：喷嘴挡板）和套筒（第二级）中的控制阀芯（通过机械反馈连接到力矩马达）组成。
力矩马达线圈上的电气输入信号通过永久磁体产生作用于电枢的力，并与弹性管 一起产生扭矩。这导致通过螺栓连接到弹性管的挡板从两个控制喷嘴之间的中心位置移开，并且在控制阀芯的前侧产生压差。该压差导致控制阀芯改变位置，并导致压力油口连接一个执行机构油口，同时，另一个执行机构油口连接到回流油口。
控制阀芯通过弯曲弹簧（机械反馈）连接到挡板或力矩马达。控制阀芯的位置将改变，直到弯曲弹簧的反馈扭矩和力矩马达的电磁扭矩达到平衡并且喷嘴挡板系统的压差变为零。
因此，控制阀芯的行程和伺服阀的流量是与电气输入信号成比例来控制的。必须注意的是，流量取决于阀压降。
外部控制电子元件，4WS2EM10-5X/... 型（单独订购）
外部控制电子元件（伺服放大器）操作阀门并放大模拟输入信号（控制值），以便通过输出信号以流量控制形式驱动伺服阀。
集成控制电子元件，4WSE2EM10-5X/... 型和 4WSE2ED10-5X/... 型
要放大模拟输入信号，需集成特别针对此阀类型进行过调整的控制电子元件 (10)。它们与力矩马达盖帽相连接。阀零位可以通过可从外部检修的电位计进行调整。
4WSE2ED10-5X/...
对于通过复位弹簧的机械控制，此类型的阀门还配备有电气阀芯位置检测和控制装置。控制阀芯位置由感应式位置传感器确定。由集成控制电子元件将位置传感器信号与控制值相比较。任何可能的控制偏差都进行电气放大，并且作为控制信号馈送到力矩马达。具有附加电气反馈时，与纯机械型号相比，电气控制器放大率可在较小信号范围内达到较高动态值。另外提供的机械反馈可确保在电源故障时，阀芯位于零范围内。
阀门仅与集成控制电子元件配合使用。阀零位可以通过可从外部检修的电位计进行调整。
注意：更改零电位可能导致系统损坏，故只能由指定的*人员执行。
力士乐四通伺服阀4WS2EM10-52/20B11ET315K8DV
力士乐REXROTH四通伺服方向阀4WS.2E...
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伺服阀的主阀一般来说和换向阀一样是滑阀结构，只不过阀芯的换向不是靠电磁铁来推动，而是靠前置级阀输出的液压力来推动，这一点和电液换向阀比较相似，只不过电液换向阀的前置级阀是电磁换向阀，而伺服阀的前置级阀是动态特性比较好的喷嘴挡板阀或射流管阀。
也就是说，伺服阀的主阀是靠前置级阀的输出压力来控制的，而前置级阀的压力则来自于伺服阀的入口p，假如p口的压力不足，前置级阀就不能输出足够的压力来推动主阀芯动作。
而我们知道，当负载为零的时候，如果四通滑阀完全打开，p口压力=t口压力+阀口压力损失（忽略油路上的其它压力损失），如果阀口压力损失很小，t口压力又为零，那么p口的压力就不足以供给前置级阀来推动主阀芯，整个伺服阀就失效了。所以伺服阀的阀口做得偏小，即使在阀口全开的情况下，也要有一定的压力损失，来维持前置级阀的正常工作。
伺服阀其实缺点极多：能耗浪费大、容易出故障、抗污染能力差、价格昂贵等等等等，好处只有一个：动态性能是所有液压阀中高的。就凭着这一个优点，在很多对动态特性要求高的场合不得不使用伺服阀，如飞机火箭的舵机控制、汽轮机调速等等。动态要求低一点的，基本上都是比例阀的天下了。
一般说来，好像伺服系统都是闭环控制，比例多用于开环控制；其次比例阀类型要多，有比例压力、流量控制阀等，控制比伺服要灵活一些。从他们内部结构看，伺服阀多是零遮盖，比例阀则有一定的死区，控制精度要低，响应要慢。但从发展趋势看，特别在比例方向流量控制阀和伺服阀方面，两者性能差别逐渐在缩小，另外比例阀的成本比伺服阀要低许多，抗污染能力也强！

伺服阀与比例阀的区别
伺服阀与比例阀之间的差别并没有严格的规定，因为比例阀的性能越来越好，逐渐向伺服阀靠近，所以近些年出现了比例伺服阀。
比例阀和伺服阀的区别主要体现在以下几点：
1.驱动装置不同。比例阀的驱动装置是比例电磁铁；伺服阀的驱动装置是力马达或力矩马达；
2.性能参数不同。滞环、中位死区、频宽、过滤精度等特性不同，因此应用场合不同，伺服阀和伺服比例阀主要应用在闭环控制系统，其它结构的比例阀主要应用在开环控系统及闭环速度控制系统；
2.1 伺服阀中位没有死区，比例阀有中位死区；
2.2 伺服阀的频响（响应频率）更高，可以高达200Hz左右，比例阀一般高几十Hz；
2.3 伺服阀对液压油液的要求更高，需要精过滤才行，否则容易堵塞，比例阀要求低一些；
3.阀芯结构及加工精度不同。比例阀采用阀芯+阀体结构，阀体兼作阀套。伺服阀和伺服比例阀采用阀芯+阀套的结构。
4.中位机能种类不同。比例换向阀具有与普通换向阀相似的中位机能，而伺服阀中位机能只有O型（Rexroth产品的E型）。
5.阀的额定压降不同。
而比例伺服阀性能介于伺服阀和比例阀之间。
比例换向阀属于比例阀的一种，用来控制流量和流向。