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力士樂比例閥4WRTE25E220L-4X/6EG24K31/A1M   REXROTH力士樂換向閥，REXROTH力士樂電磁閥 由上海韋米機電設備有限公司專業(yè)提供

換向閥是具有兩種以上流動形式和兩個以上油口的方向控制閥。是實現(xiàn)液壓油流的溝通、切斷和換向，以及壓力卸載和順序動作控制的閥門。
可分為手動換向閥、電磁換向閥、電液換向閥等。
又稱克里斯閥，閥門的一種，具有多向可調的通道，可適時改變流體流向。
工作時借著閥外的驅動傳動機構轉動驅動軸，帶動搖拐臂，啟動閥板，使工作流體時而從左入口通向閥的下部出口，時而從右入口變換通向下部出口，實現(xiàn)了周期變換流向的目的。
這種變換閥在石油、化工生產(chǎn)中有著廣泛的應用，在合成氨造氣系統(tǒng)中最為常用。此外，換向閥還可作成閥瓣式的結構，多用于較小流量的場合。工作時只需轉動手輪通過閥瓣來變換工作流體的流向。

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、要么小，沒有中間狀態(tài)，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(xù)控制：閥口可以根據(jù)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(jié)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(xiàn)對流量的節(jié)流控制（當然經(jīng)過結構上的改動也可實現(xiàn)壓力控制等），既然是節(jié)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。

上海韋米機電設備有限公司主營產(chǎn)品:
液壓元件：柱塞泵、葉片泵、齒輪泵、馬達、截止閥、方向閥、減壓閥、流量控制閥、比例閥、伺服閥、插裝閥、電液換向閥、電磁閥、電磁球閥、蓄能器、放大版、壓力繼電器、壓力傳感器。
氣動元件:：氣動閥、閥島、閥組、電磁閥、換向閥、壓力調節(jié)閥、流量控制閥,止回閥、氣缸和驅動裝置、壓縮空氣氣源處理單元、真空技術、傳感器、氣動連接技術,電氣連接技術。
電控伺服:：伺服驅動器,伺服電機、PLC模塊、I/O模塊、框架模塊、電源模塊、數(shù)據(jù)接口模塊、鍵相位模塊、繼電器模塊、測速模塊、溫度模塊、顯示屏、傳感器、探頭、前置器、延伸電纜。

以下是本公司常用德國博世REXROTH力士樂旗下產(chǎn)品的部分型號：

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）4WRTE
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