力士樂4WS2EM系列伺服閥在液壓伺服系統(tǒng)中起到信號轉換、功率放大及反饋等控制作用。主要分為機液伺服閥和電液伺服閥兩種。機液伺服閥是以機械運動來控制液體壓力和流量的伺服元件。Rexroth電液伺服閥是一種能把微弱的電氣信號轉變?yōu)榇蠊β室簤耗埽髁?、壓力）的伺服閥。力士樂電液伺服閥廣泛地應用于電液位置,速度,加速度,力伺服系統(tǒng),以及伺服振動發(fā)生器中.它具有體積小,結伺服閥構緊湊,功率放大系數高,控制精度高,直線性好,死區(qū)小,靈敏度高,動態(tài)性能好以及響應速度快等優(yōu)點.
Rexroth力士樂伺伺服閥的工作原理是：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伺服閥時，檔板向右移動，使右邊噴嘴的節(jié)流作用加強，流量減少，右側背壓上升；同時使左邊噴嘴節(jié)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S流向C2，送到負載。負載回油通過 C1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(tài)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。表中是伺服閥的分類。
力士樂伺服閥在工業(yè)中是比較常用的一種特殊性能閥，尤其是像電廠使用的特別多，因為該伺服閥可以保證其他機械的正常使用，那么力士樂4WS2EM系列伺服閥都有哪些型號呢？下面為您提供該系列的全部型號進行參考和選擇，如下：
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結構比較復雜，造價高，對油的質量和清潔度要求高。新型的伺服閥正試圖克服這些缺點，例如利用電致伸縮元件的伺服閥，使結構大為簡化。另一個方向是研制特殊的工作油（如電氣粘性油）。這種工作油能在電磁的作用下改變粘性系數。利用這一性質就可通過電信號直接控制油流。力士樂4WS2EM...VH1型伺服閥，Rexroth電液伺服閥，力士樂液控伺服閥，德國Rexroth伺服閥