力士樂比例閥是一種按輸入的電信號連續地、按比例地控制液壓系統的液流方向、流量和壓力的閥類。

它山電-機械比例轉換裝置和液壓控制閥本體兩大部分構成.前者將輸入的電信號連續地按比例地轉換為機械力和位移輸出，后者在接受這種機械力和位移之后、按比例連續地輸出壓力和流量.力士樂比例閥的發展主要有兩個途徑一是用比例電磁鐵取代傳統液壓閥的手動調節裝置或取代普通電磁鐵發展起來的;二是由電液伺服閥簡化結構、降低精度發展起來的。
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設計中就使比例電磁鐵的銜鐵在這段行程中工作。因此。改變線圈中的電流，即可在銜鐵上得到與其成正比的吸力。用比例電磁鐵代替螺旋手柄來調整液壓閥，就能使輸出樂力或流量與輸人電流對應成比例地發生變化。

力士樂比例閥用于模擬控制，是介于普通開關控制與伺服控制之間的控制方式，它也特別適合于設備的革新或改造。使設備自動化控制水平大為提高。其在現代液雌系統中占比例很大。

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