力士樂(lè)分步直動(dòng)式電磁閥： 原理：REXROTH電磁閥是一種直動(dòng)和先導(dǎo)式相結(jié)合的原理，當(dāng)入口與出口沒(méi)有壓差時(shí)，通電后，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)入口與出口達(dá)到啟動(dòng)壓差時(shí)，通電后，力士樂(lè)電磁閥電磁力先導(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)：REXROTH力士樂(lè)電磁閥在零壓差或真空、高壓時(shí)亦能可*動(dòng)作，但功率較大，要求必須水平安裝。
REXROTH電磁閥液壓裝置中容易產(chǎn)生噪聲的元件一般認(rèn)為是泵和閥，閥中又以溢流閥和電磁換向閥等為主。產(chǎn)生噪聲的因素很多。 力士樂(lè)REXROTH電磁閥的噪聲有流速聲和機(jī)械聲二種。流速聲中主要由油液振動(dòng)、空穴以及液壓沖擊等原因產(chǎn)生的噪聲。機(jī)械聲中主要由閥中零件的撞擊和磨擦等原因產(chǎn)生的噪聲。 上海維特銳在德國(guó)與REXROTH合作，可長(zhǎng)期穩(wěn)定供應(yīng)力士樂(lè)電磁閥，REXROTH導(dǎo)軌，力士樂(lè)柱塞泵等產(chǎn)品
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