(一)、直動(dòng)式電磁閥

原理：通電時(shí)，電磁線圈產(chǎn)生電磁力把關(guān)閉件從閥座上提起，閥門(mén)打開(kāi)；斷電時(shí)，電磁力消失，彈簧

力把關(guān)閉件壓在閥座上，閥門(mén)關(guān)閉。
特點(diǎn)：在真空、負(fù)壓、零壓時(shí)能正常工作，但一般通徑不超過(guò)25mm。
(二)、分步直動(dòng)式電磁閥
原 理：它是一種直動(dòng)和先導(dǎo)式相結(jié)合的原理，當(dāng)入口與出口壓差≤0.05Mpa，通電時(shí)，電磁力直接把

先導(dǎo)小閥和主閥關(guān)閉件依次向上提起，閥門(mén)打開(kāi)。當(dāng)入口與 出口壓差>0.05Mpa，通電時(shí)，電磁力先打

開(kāi)先導(dǎo)小閥，主閥下腔壓力上升，上腔壓力下降，從而利用壓差把主閥向上推開(kāi)；斷電時(shí)，先導(dǎo)閥和

主閥利 用彈簧力或介質(zhì)壓力推動(dòng)關(guān)閉件，向下移動(dòng)，使閥門(mén)關(guān)閉。
特點(diǎn)：在零壓差或真空、高壓時(shí)亦能可*工作，但功率較大，要求豎直安裝。
(三)、先導(dǎo)式電磁閥
原理：通電時(shí)，電磁力把先導(dǎo)孔打開(kāi)，上腔室壓力迅速下降，在關(guān)閉件周?chē)纬缮系拖赂叩膲翰睿?/p>

動(dòng)關(guān)閉件向上移動(dòng)，閥門(mén)打開(kāi)；斷電時(shí)，彈簧力把先導(dǎo)孔關(guān)閉，入口壓力通過(guò)旁通孔迅速進(jìn)入上腔室

在關(guān)閥件周?chē)纬上碌蜕细叩膲翰睿苿?dòng)關(guān)閉件向下移動(dòng)，關(guān)閉閥門(mén)。
特點(diǎn)：流體壓力范圍上限很高，但必須滿(mǎn)足流體壓差條件。
目 前在國(guó)內(nèi)銷(xiāo)售的常用電磁閥有DV(DVF)、PGA、PEB(PESB)、BPE系列十幾個(gè)品種，口徑從 3/4”到3

”，主要用于農(nóng)業(yè)、園林、高爾夫、工業(yè)防塵及噴泉等領(lǐng)域。常用電磁閥多為隔膜閥，其工作原理是

：閥體分為上下兩個(gè)室，中間為隔膜，在水壓相同 的條件下，由于隔膜上下受力面積不同而產(chǎn)生壓力

差，到達(dá)切斷水流的目的。
電磁閥開(kāi)啟狀態(tài)----當(dāng)通過(guò)遠(yuǎn)程控制器給電信號(hào)或手動(dòng)旋轉(zhuǎn)電磁頭，排水通道打開(kāi)，上隔膜室內(nèi)水排

出，室內(nèi)壓強(qiáng)減小，作用在上隔膜的壓力變小，在上游壓力作用下推動(dòng)隔膜向上運(yùn)動(dòng)，打開(kāi)管路通道

。
電磁閥關(guān)閉狀態(tài)----手動(dòng)關(guān)閉或斷開(kāi)電磁頭電信號(hào)，使排水通道關(guān)閉，上隔膜室內(nèi)慢慢充滿(mǎn)水，等到

橫膈膜上下壓強(qiáng)一致時(shí)，由于橫膈膜上側(cè)受力面積較大，使隔膜向下運(yùn)動(dòng)，關(guān)閉管路通道。
單電控只有一個(gè)電磁頭,得電后,電磁閥換向，失電后，電磁閥由于彈簧的作用復(fù)位，雙電控2位電磁閥

有2個(gè)電磁頭，只能其中一個(gè)得電，得電后，電磁閥換向,失電后，電磁閥保持位置，必須另一邊的電

磁頭得電，電磁閥才回復(fù)原位。
 

上海樂(lè)利自動(dòng)化科技有限公司

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