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電液閥是由一個(gè)主閥和兩個(gè)電磁閥組成，主閥響應(yīng)速度的控制是兩個(gè)柱塞閥，安裝于主閥的入口和出口。通過(guò)兩個(gè)柱塞閥細(xì)微調(diào)節(jié)主閥的啟閉速度。調(diào)整這些裝置（柱塞閥）以控制流入和流出活塞上方介質(zhì)的流量。達(dá)到主閥啟閉速度能基于介質(zhì)的粘度及壓力調(diào)整的目的。
常開(kāi)（N.O）和常閉（N.C）電磁閥分別安裝在主閥的進(jìn)油回路和出油回路中，用于控制主閥的動(dòng)作，當(dāng)兩電磁閥通電時(shí)，進(jìn)油孔（上游閥）回路關(guān)閉，先導(dǎo)孔（下游閥）回路打開(kāi)，活塞上腔泄壓，活塞上行，主閥打開(kāi)。反之，活塞下行，主閥關(guān)閉。在主閥開(kāi)啟和關(guān)閉過(guò)程中，可將流量（流速）信號(hào)及閥塞位置信號(hào)傳送給計(jì)算機(jī)，經(jīng)過(guò)計(jì)算機(jī)處理后發(fā)出相應(yīng)的指令，控制兩個(gè)電磁導(dǎo)閥的通、斷電狀態(tài)，使活塞的上下腔的液壓差產(chǎn)生變化，從而將活塞控制在所需的開(kāi)啟度上，實(shí)現(xiàn)對(duì)管道介質(zhì)流量的控制。