力士樂四通伺服閥4WS2EM10-52/20B11ET315K8DV，德國REXROTH四通伺服閥，力士樂伺服閥，上海韋米機電設備有限公司主營銷售產品，原廠原裝，質量保障，熱誠歡迎新老客戶咨詢購買！
力士樂REXROTH四通型號的方向伺服閥
4WS.2E...
規格 10
組件系列 5X
*大工作壓力 315 bar
*大流量 180 l/min
用于控制位置、力、壓力或速率的閥
帶機械反饋或機械和電氣反饋的二級伺服閥
第 1 級噴嘴/擋板放大器
用于底板安裝：孔圖按 ISO 4401
干燥的控制電機，液壓液不得弄臟電磁鐵間隙
也用作 3 通結構
無磨損控制閥芯復位元件
在外部控制或通過集成電子元件 (OBE) 控制
閥和集成控制電子元件已進行調節和測試
帶液動力補償的控制閥芯
中心固定的控制閥套，因此對溫度和壓力的敏感性很低
控制閥套上的壓力腔帶有間隙密封，因此無密封圈磨損
第 1 級的過濾器可從外部自由檢修
產品說明
4WS(E)2EM10-5X/...
4WS(E)2EM10-5X 型閥門是電動操作的 2 級伺服方向閥。它們主要用于控制位置、力和速率。
這些閥門由機電轉換器（力矩馬達）、液壓放大器（原理：噴嘴擋板）和套筒（第二級）中的控制閥芯（通過機械反饋連接到力矩馬達）組成。
力矩馬達線圈上的電氣輸入信號通過永久磁體產生作用于電樞的力，并與彈性管 一起產生扭矩。這導致通過螺栓連接到彈性管的擋板從兩個控制噴嘴之間的中心位置移開，并且在控制閥芯的前側產生壓差。該壓差導致控制閥芯改變位置，并導致壓力油口連接一個執行機構油口，同時，另一個執行機構油口連接到回流油口。
控制閥芯通過彎曲彈簧（機械反饋）連接到擋板或力矩馬達。控制閥芯的位置將改變，直到彎曲彈簧的反饋扭矩和力矩馬達的電磁扭矩達到平衡并且噴嘴擋板系統的壓差變為零。
因此，控制閥芯的行程和伺服閥的流量是與電氣輸入信號成比例來控制的。必須注意的是，流量取決于閥壓降。
外部控制電子元件，4WS2EM10-5X/... 型（單獨訂購）
外部控制電子元件（伺服放大器）操作閥門并放大模擬輸入信號（控制值），以便通過輸出信號以流量控制形式驅動伺服閥。
集成控制電子元件，4WSE2EM10-5X/... 型和 4WSE2ED10-5X/... 型
要放大模擬輸入信號，需集成特別針對此閥類型進行過調整的控制電子元件 (10)。它們與力矩馬達蓋帽相連接。閥零位可以通過可從外部檢修的電位計進行調整。
4WSE2ED10-5X/...
對于通過復位彈簧的機械控制，此類型的閥門還配備有電氣閥芯位置檢測和控制裝置。控制閥芯位置由感應式位置傳感器確定。由集成控制電子元件將位置傳感器信號與控制值相比較。任何可能的控制偏差都進行電氣放大，并且作為控制信號饋送到力矩馬達。具有附加電氣反饋時，與純機械型號相比，電氣控制器放大率可在較小信號范圍內達到較高動態值。另外提供的機械反饋可確保在電源故障時，閥芯位于零范圍內。
閥門僅與集成控制電子元件配合使用。閥零位可以通過可從外部檢修的電位計進行調整。
注意：更改零電位可能導致系統損壞，故只能由指定的*人員執行。
力士樂四通伺服閥4WS2EM10-52/20B11ET315K8DV
力士樂REXROTH四通伺服方向閥4WS.2E...
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伺服閥的主閥一般來說和換向閥一樣是滑閥結構，只不過閥芯的換向不是靠電磁鐵來推動，而是靠前置級閥輸出的液壓力來推動，這一點和電液換向閥比較相似，只不過電液換向閥的前置級閥是電磁換向閥，而伺服閥的前置級閥是動態特性比較好的噴嘴擋板閥或射流管閥。
也就是說，伺服閥的主閥是靠前置級閥的輸出壓力來控制的，而前置級閥的壓力則來自于伺服閥的入口p，假如p口的壓力不足，前置級閥就不能輸出足夠的壓力來推動主閥芯動作。
而我們知道，當負載為零的時候，如果四通滑閥完全打開，p口壓力=t口壓力+閥口壓力損失（忽略油路上的其它壓力損失），如果閥口壓力損失很小，t口壓力又為零，那么p口的壓力就不足以供給前置級閥來推動主閥芯，整個伺服閥就失效了。所以伺服閥的閥口做得偏小，即使在閥口全開的情況下，也要有一定的壓力損失，來維持前置級閥的正常工作。
伺服閥其實缺點極多：能耗浪費大、容易出故障、抗污染能力差、價格昂貴等等等等，好處只有一個：動態性能是所有液壓閥中高的。就憑著這一個優點，在很多對動態特性要求高的場合不得不使用伺服閥，如飛機火箭的舵機控制、汽輪機調速等等。動態要求低一點的，基本上都是比例閥的天下了。
一般說來，好像伺服系統都是閉環控制，比例多用于開環控制；其次比例閥類型要多，有比例壓力、流量控制閥等，控制比伺服要靈活一些。從他們內部結構看，伺服閥多是零遮蓋，比例閥則有一定的死區，控制精度要低，響應要慢。但從發展趨勢看，特別在比例方向流量控制閥和伺服閥方面，兩者性能差別逐漸在縮小，另外比例閥的成本比伺服閥要低許多，抗污染能力也強！
伺服閥與比例閥的區別
伺服閥與比例閥之間的差別并沒有嚴格的規定，因為比例閥的性能越來越好，逐漸向伺服閥靠近，所以近些年出現了比例伺服閥。
比例閥和伺服閥的區別主要體現在以下幾點：
1.驅動裝置不同。比例閥的驅動裝置是比例電磁鐵；伺服閥的驅動裝置是力馬達或力矩馬達；
2.性能參數不同。滯環、中位死區、頻寬、過濾精度等特性不同，因此應用場合不同，伺服閥和伺服比例閥主要應用在閉環控制系統，其它結構的比例閥主要應用在開環控系統及閉環速度控制系統；
2.1 伺服閥中位沒有死區，比例閥有中位死區；
2.2 伺服閥的頻響（響應頻率）更高，可以高達200Hz左右，比例閥一般高幾十Hz；
2.3 伺服閥對液壓油液的要求更高，需要精過濾才行，否則容易堵塞，比例閥要求低一些；
3.閥芯結構及加工精度不同。比例閥采用閥芯+閥體結構，閥體兼作閥套。伺服閥和伺服比例閥采用閥芯+閥套的結構。
4.中位機能種類不同。比例換向閥具有與普通換向閥相似的中位機能，而伺服閥中位機能只有O型（Rexroth產品的E型）。
5.閥的額定壓降不同。
而比例伺服閥性能介于伺服閥和比例閥之間。
比例換向閥屬于比例閥的一種，用來控制流量和流向。
