力士樂4WS（E）2EM10-5X/... 四通方向伺服閥是電動(dòng)操作的 2 級(jí)方向伺服閥。它們主要用于控制位置，力和速率。
這些閥由機(jī)電轉(zhuǎn)換器（力矩馬達(dá)）（1），液壓放大器（噴嘴擋板原理）（2）和閥套（第 2 級(jí)）中的控制閥芯（3）（通過機(jī)械反饋連接到力矩馬達(dá)）組成。力矩馬達(dá)的線圈（4）上的電氣輸入信號(hào)通過作用于電樞（5）的*磁體產(chǎn)生力，并與彈性管（6）一起產(chǎn)生扭矩。這導(dǎo)致通過銷連接到彈性管（6）的擋板（7）從兩個(gè)控制噴嘴（8）之間的中心位置移開，并且在控制閥芯的端表面產(chǎn)生壓差。該
壓差導(dǎo)致控制閥芯改變位置，并導(dǎo)致壓力油口連接一個(gè)執(zhí)行機(jī)構(gòu)油口，同時(shí)，另一個(gè)執(zhí)行機(jī)構(gòu)油口連接到回流油口?？刂崎y芯通過彎曲彈簧（機(jī)械反饋）（9）連接到擋板或力矩馬達(dá)?？刂崎y芯的位置將改變，直到彎曲彈簧的反饋扭矩和力矩馬達(dá)的電磁扭矩達(dá)到平衡并且噴嘴擋板系統(tǒng)的壓差變?yōu)榱?。因此，控制閥芯的行程和伺服閥的流量是與電氣輸入信號(hào)成比例來(lái)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，類型 4WS2EM10-5X/...（單獨(dú)訂購(gòu)）
外部控制電子元件（伺服放大器）啟動(dòng)閥并放大模擬輸入信號(hào)（控制值），因此，通過輸出信號(hào)，伺服閥是以流量控制形式驅(qū)動(dòng)的。
集成控制電子元件，類型 4WSE2EM10-5X/...和 4WSE2ED10-5X/...
要放大模擬輸入信號(hào)，需集成特別針對(duì)此閥類型進(jìn)行過調(diào)整的控制電子元件（10）。它們位于力矩馬達(dá)蓋帽中。閥零位可以通過可從外部調(diào)整的電位計(jì)進(jìn)行調(diào)整。
4WSE2ED10-5X/...
除了通過反饋彈簧的機(jī)械控制，此類型的閥還配備有電氣閥芯位置檢測(cè)和控制。控制閥芯位置由感應(yīng)式位置傳感器（11）確定。由集成控制電子元件（10）將位置傳感器信號(hào)與控制值
相比較。任何可能的控制偏差都進(jìn)行電氣放大，并且作為控制信號(hào)饋送到力矩馬達(dá)。與純機(jī)械型號(hào)相比，具有附加電氣反饋時(shí)，電氣控制器增益可在小信號(hào)范圍內(nèi)達(dá)到較高動(dòng)態(tài)值。另外提供的機(jī)械反饋確保電氣電源失敗時(shí)，閥芯位于零范圍內(nèi)。閥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(jì)進(jìn)行調(diào)整。
注意：
更改零位可能導(dǎo)致系統(tǒng)損壞并且只能由指派的專業(yè)人員執(zhí)行。 
力士樂四通方向伺服閥的型號(hào)大全：4WS2EM 6-2X/2B11ET210K17EV
4WS2EM 6-2X/2B11ET315K17DV
4WS2EM 6-2X/2B11ET315K17EV
4WS2EM 6-2X/5B11ET210K17DV
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4WS2EM 6-2X/5B11ET315K17EV
4WS2EM 6-2X/10B11ET210K17EV
4WS2EM 6-2X/10B11ET315K17DV
4WS2EM 6-2X/10B11ET315K17EV
4WS2EM 6-2X/15B11ET210K17EV
4WS2EM 6-2X/15B11ET315K17EV
4WS2EM 6-2X/20B11ET210K17EV
4WS2EM 6-2X/20B11ET315K17DV
4WS2EM 6-2X/20B11ET315K17EV
4WS2EM 6-2X/25B11ET315K17EV
4WS2EM 10-5X/20B11-210K31EV
4WS2EM 10-5X/20B11-315K31EV
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4WS2EM 10-5X/30B11E210K31EV
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4WS2EM 10-5X/45B11-210K31EV
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4WS2EM 10-5X/60B11-210K31EV
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4WS2EM 10-5X/75B11-210K31EV
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4WS2EM 10-5X/90B11-210K31EV
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4WSE2EM 6-2X/2B8ET210K17EV
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4WSE2EM 6-2X/15B8ET210K17EV
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4WSE2ED 10-5X/20B9-210K31EV
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4WSE2ED 10-5X/60B9-315K31EV
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4WSE2ED 10-5X/75B9-210K31EV
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4WSE2ED 10-5X/90B9-315K31EV
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4WSE2EM 10-5X/60B9E315K31EV
4WSE2EM 10-5X/60B9ET210K31EV
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4WSE2EM 10-5X/60B13ET315K31EV
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4WSE2EM 10-5X/75B9-315K31EV
4WSE2EM 10-5X/75B9E210K31EV
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4WSE2EM 10-5X/75B13-315K31EV
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4WSE3EE 16-1X/100B8-210K9EV
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4WSE3EE 16-1X/200B8-315K9EV
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4WSE3EE 16-1X/300B8-210K9EV
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4WSE3EE 25-2X/400B8-210K9EV
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4WSE3EE 25-2X/500B8-210K9EV
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4WSE3EE 32-4X/500B9-210K9EV
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4WSE3EE 32-4X/700B8-315K9EV
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4WSE3EE 32-4X/1000B8-315K9EV
4WSE3EE 32-4X/1000B9-210K9EV
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