力士樂(lè)比例閥4WRTE25E220L-4X/6EG24K31/A1M   REXROTH力士樂(lè)換向閥，REXROTH力士樂(lè)電磁閥 由上海韋米機(jī)電設(shè)備有限公司專(zhuān)業(yè)提供

換向閥是具有兩種以上流動(dòng)形式和兩個(gè)以上油口的方向控制閥。是實(shí)現(xiàn)液壓油流的溝通、切斷和換向，以及壓力卸載和順序動(dòng)作控制的閥門(mén)。
可分為手動(dòng)換向閥、電磁換向閥、電液換向閥等。
又稱(chēng)克里斯閥，閥門(mén)的一種，具有多向可調(diào)的通道，可適時(shí)改變流體流向。
工作時(shí)借著閥外的驅(qū)動(dòng)傳動(dòng)機(jī)構(gòu)轉(zhuǎn)動(dòng)驅(qū)動(dòng)軸，帶動(dòng)搖拐臂，啟動(dòng)閥板，使工作流體時(shí)而從左入口通向閥的下部出口，時(shí)而從右入口變換通向下部出口，實(shí)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(yīng)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(jié)構(gòu)，多用于較小流量的場(chǎng)合。工作時(shí)只需轉(zhuǎn)動(dòng)手輪通過(guò)閥瓣來(lái)變換工作流體的流向。

比例閥 閥對(duì)流量的控制可以分為兩種：
一種是開(kāi)關(guān)控制：要么全開(kāi)、要么全關(guān)，流量要么、要么小，沒(méi)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(kāi)任意一個(gè)開(kāi)度，由此控制通過(guò)流量的大小，這類(lèi)閥有手動(dòng)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(shí)現(xiàn)對(duì)流量的節(jié)流控制（當(dāng)然經(jīng)過(guò)結(jié)構(gòu)上的改動(dòng)也可實(shí)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?yàn)樗枰欢ǖ牧髁縼?lái)維持前置級(jí)控制油路的工作。

上海韋米機(jī)電設(shè)備有限公司主營(yíng)產(chǎn)品:
液壓元件：柱塞泵、葉片泵、齒輪泵、馬達(dá)、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(dòng)元件:：氣動(dòng)閥、閥島、閥組、電磁閥、換向閥、壓力調(diào)節(jié)閥、流量控制閥,止回閥、氣缸和驅(qū)動(dòng)裝置、壓縮空氣氣源處理單元、真空技術(shù)、傳感器、氣動(dòng)連接技術(shù),電氣連接技術(shù)。
電控伺服:：伺服驅(qū)動(dòng)器,伺服電機(jī)、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(cè)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(guó)博世REXROTH力士樂(lè)旗下產(chǎn)品的部分型號(hào)：

力士樂(lè)REXROTH三位四通高響應(yīng)換向閥、先導(dǎo)式、電氣位置反饋和集成電子放大版（OBE）4WRTE
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