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力士樂比例閥是一種新型的液壓控制裝置，在普通壓力閥、流量閥和方向閥上，用比例電磁鐵替代原有的控制部分，按輸入的電氣信號連續地、按比例地對油流的壓力、流量或方向進行遠距離控制。力士樂比例閥一般都具有壓力補償性能，輸出壓力和流量可以不受負載變化的影響
力士樂比例閥的工作原理如下：在不制動時,活塞在感載彈簧通過杠桿施加的推力F的作用下,處 于左端極限位置,這時閥門離開閥座打開,使輸入輸出油路相通。當開始制動時,來自助力器的壓力為P1的制動液由進油口進入,并通過閥門從出油口輸至后制動管路.此時輸出液壓P,等于輸入液壓P1當制動踏板力增大時,P1和P2同步增大。但由于活塞左側承壓面積大于右側,致使活塞左側受到的力也大于右側. Rexroth力士樂比例閥的結構和其它參數一定的情況下,調節作用的初始控制壓力P·的值取決于感載的比例閥感載彈簧預緊力的大小,其變化范圍在.
■規格6和10
■安裝面按*** 4401
■控制流量的方向和大小
■比例電磁鐵操作
■對中彈簧控制閥芯
■不同閥芯可遮蓋
■集成控制電氣元件（OBE）用于4WREE型
6 通徑和 10 通徑直動式比例方向閥，帶集成的閥電子元件和位
控閥芯。控制電子元件（VT 13080 和 VT 13081 類型）集成
在閥上。
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