0811404720 4WRREH6VB40L-1X/G24K0/B5M力士樂比例閥
閥對流量的控制可以分為兩種：
一種是開關控制：要么全開、要么全關，流量要么最大、要么最小，沒有中間狀態，如普通的電磁直通閥、電磁換向閥、電液換向閥。
另一種是連續控制：閥口可以根據需要打開任意一個開度，由此控制通過流量的大小，這類閥有手動控制的，如節流閥，也有電控的，如比例閥、伺服閥。
所以使用比例閥或伺服閥的目的就是：以電控方式實現對流量的節流控制（當然經過結構上的改動也可實現壓力控制等），既然是節流控制，就必然有能量損失，伺服閥和其它閥不同的是，它的能量損失更大一些，因為它需要一定的流量來維持前置級控制油路的工作。
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力士樂REXROTH三位四通高響應換向閥、先導式、電氣位置反饋和集成電子放大版（OBE）4WRGE
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