力士樂比例閥是一種按輸入的電信號連續地、按比例地控製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製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，後者在接受這種機械力和位移之後、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。

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。

力士樂比例閥用於模擬控製，是介於普通開關控製與伺服控製之間的控製方式，它也特別適合於設備的革新或改造。使設備自動化控製水平大為提高。其在現代液雌系統中占比例很大。

與普通液壓閥相比.力士樂比例閥的優點是:①能簡單地實現遠距離控製:②能連續地、按比例地控製液壓系統的壓力和流量。從而實現對執行機構的位置、速度和力的連續控製，並能防止或減小壓力、速度變換時的沖擊;③油路簡化，元件數量少。

力士樂比例閥適用於既要求能連續控製脹力、流量.和方向.而又不需要很I的控製精度的場合。

力士樂比例閥也分為壓力閥、流量閥和方向閥幾大類。

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4WRDE16V125L-5X/6L24K9/M-202
4WRDE16V125L-5X/6L24K9/V-576
4WRDE16V200L-5X/6L24K9/MR
4WRDE16V200L-5X/6L24K9/V
4WRDE16V200L-5X/6L24K9/WG152MR
4WRDE16V200P-5X/6L24K9/VR-576
4WRDE16V200R-5X/6L24K9/M
4WRDE16W1-125L-5X/6L24K9/MR-280
4WRDE16W1-125L-5X/6L24K9/V
4WRDE25E220L-5X/6L24K9/MR-280
4WRDE25E350L-5X/6L24K9/M-280
4WRDE25E350L-5X/6L24K9/MR-280
4WRDE25V1-220L-5X/6L24K9/WG152MR
4WRDE25V1-350L-5X/6L24K9/WG152MR
4WRDE25V1-350P-5X/6L24K9/WG152MR
4WRDE25V220L-5X/6L24ETK9/M
4WRDE25V220L-5X/6L24ETK9/M-576
4WRDE25V220L-5X/6L24ETK9/WG152M
4WRDE25V220L-5X/6L24K9/M
4WRDE25V220L-5X/6L24K9/M-576
4WRDE25V220P-5X/6L24K9/M
4WRDE25V350L-5X/6L15K9/M
4WRDE25V350L-5X/6L24ETK9/M
4WRDE25V350L-5X/6L24ETK9/WG152M
4WRDE25V350L-5X/6L24K9/M
4WRDE25V350L-5X/6L24K9/MR-576
4WRDE25V350L-5X/6L24K9/WG152MR
4WRDE25V350R-5X/6L24K9/M
4WRDE27V1-500L-5X/6L24K9/WG152MR
4WRDE27V500L-5X/6L24K9/MR-280
4WRDE27V500L-5X/6L24K9/MR-576
4WRDE32E600L-5X/6L24K9/MR
4WRDE32Q1-600S-5X/6L15K9/MR
4WRDE32V1-600L-5X/6L24K9/WG152MR
4WRDE32V600L-5X/6L24ETK9/M
4WRDE32V600L-5X/6L24ETK9/WG152M
4WRDE32V600L-5X/6L24K9/MR
4WRDE32V600L-5X/6L24K9/MR-202
4WRDE32V600L-5X/6L24K9/MR-576
4WRDE32V600L-5X/6L24K9/VR-881
4WRDE32V600L-5X/6L24K9/WG152MR
4WRDE35E1000P-5X/6L15K9/M
4WRDE35V1000L-5X/6L24K9/WG152MR

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