德國力士樂伺服閥4WS2EM10-5X/30B11ET315K31EV原理
力士樂德國產伺服閥，直接德國原廠訂貨，提供報關單，質保一年。力士樂rexroth伺服閥本系列產品為我公司主打產品系列。
力士樂伺服閥，是電液轉換元件同時也是功率放大原件。是電液伺服系統控制的核心。
伺服閥，主要由6部分組成，分別是：永磁力矩馬達、噴嘴、檔板、閥芯、閥套以及控制腔。而它的工作原理就是當連通電流的時候，擋板會向右移動，使得其右邊的噴嘴節能作用變強，自然流量也會隨之減少。與此同時左邊噴嘴節流作用會減少，流量會隨之增加。這時候閥芯它兩端就會失去平衡，使得閥芯會向左移動。然后閥芯它的位移量跟馬達的電流量是形成正比的，而在閥芯上面的液壓力跟彈簧力是剛好平衡的。
力士樂伺服閥由永磁力矩馬達、噴嘴、檔板、閥芯、閥套和控制腔組成。當輸入線圈通入電流時，檔板向右移動，使右邊噴嘴的節流作用加強，流量減少，右側背壓上升;同時使左邊噴嘴節流作用減小，流量增加，左側背壓下降。閥芯兩端的作用力失去平衡, 閥芯遂向左移動。高壓油從流向，送到負載。負載回油通過流過回油口，進入油箱。閥芯的位移量與力矩馬達的輸入電流成正比，作用在閥芯上的液壓力與彈簧力相平衡，因此在平衡狀態下力矩馬達的差動電流與閥芯的位移成正比。如果輸入的電流反向，則流量也反向。
力士樂伺服閥主要用在電氣液壓伺服系統中作為執行元件(見液壓伺服系統)。在伺服系統中，液壓執行機構同電氣及氣動執行機構相比，具有快速性好、單位重量輸出功率大、傳動平穩、抗干擾能力強等特點。另一方面，在伺服系統中傳遞信號和校正特性時多用電氣元件。因此，現代高性能的伺服系統也都采用電液方式，伺服閥就是這種系統的必需元件。
力士樂部分型號如下：
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