3WE 6../.E型4WE 6 ../.E型三位四通，二位四通和兩位三通帶濕式AC及DC電磁鐵的液壓方向閥；通徑6，最高壓力350 bar，最大流量60 /80(AC/DC)L/min，重量：帶一個電磁鐵的閥1.45kg，帶兩個電磁鐵的閥1.95kg；WE 6../.E：3個或4個工作主油口，帶高功率電磁鐵E，N9=帶護罩的手動應急操作，N=手動應急操作，無代碼不帶手動應急操作；電器連接：單獨連接，K4=不帶插頭，DL=在蓋上有引線有指示燈(LED)顯示，DKL=在蓋上帶有集中插頭，帶指示燈（LED）顯示；直動式高功率電磁鐵操作的電磁滑閥；安裝面油口分布按DIN 24340 A型（無定位孔），安裝面油口分布按ISO4401-03-02-0-94，NFPA T3.5.1MR1和ANSI B93-7 D03（具有定位孔/反扭轉銷）；具有可拆線圈的濕式交流或直流電磁鐵；電磁鐵線圈可轉90度，線圈更換時無需打開壓力密封腔；通過導線盒直接在線圈或中央進行電氣連接；可選手動應急操作….

力士樂換向閥是利用閥芯相對于閥體的相對運動，實現油路換接，或者是接通、關斷，從而實現液壓執行元件的啟動、停止或改變運動方向。

對換向閥的基本要求是，液流通過閥的壓力損失要小，泄漏要小，換向要求平穩可靠。 
換向閥的種類很多，按閥芯的結構分，有滑閥式和轉閥式兩種。滑閥式換向閥用的多，有如下優點:較為簡單的結構，有高度的換效能，閥芯徑向力均衡，操作力低，摩擦小，易于實現多種控制功能。按操作方式分有手動、機動、電動、液動、電液動等多種。按閥芯工 
作在閥體內所處的位置區分有二位和三位閥。按換向閥的接口分有二通、三通、四通和五通四種。 
1、滑閥式換向閥的工作原理和機能 
我們以力士樂公司WE型三位四通電磁換向閥為例來說明。圖10是結構圖，主要由閥體（1）、電磁鐵（2）、滑閥（3）及復位彈簧（4）等組成。電磁鐵不通電時，滑閥即閥芯由復位彈簧保持在中間位置或初始位置（對于二位閥）。在此位置，所有油口 P. T. A. B靠閥芯上的肩和閥體上的環形槽的結構關系都是相互隔開的。

 

力士樂WE型換向閥

     當左電磁通電時，靠電磁鐵推力通過推桿（5），使滑閥（3）右移到上作位置上（終端位置），由此改變了液流的接通關系為P、T、A、B。如果右電磁通電，滑閥左移則形成P->A. B->T的接通關系。閥芯有二個工作位置：中位、右位、左位，稱為三位。具有四個連接油口稱為四通。閥芯在不同工作位置時油路的接通關系不同，稱之為閥的機能。圖11是前述閥的機能符號。對這種機能符號應很好地理解和熟記。三個方塊表示滑閥的三個工作位置，字母P. A. B. T表示四個油口。

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