力士樂分步直動式電磁閥： 原理：REXROTH電磁閥是一種直動和先導(dǎo)式相結(jié)合的原理，當(dāng)入口與出口沒有壓差時，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，閥門打開。當(dāng)入口與出口達(dá)到啟動壓差時，通電后，力士樂電磁閥電磁力先導(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；斷電時，先導(dǎo)閥利用彈簧力或介質(zhì)壓力推動關(guān)閉件，向下移動，使閥門關(guān)閉。
特點：REXROTH力士樂電磁閥在零壓差或真空、高壓時亦能可*動作，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、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。 上海維特銳在德國與REXROTH合作，可長期穩(wěn)定供應(yīng)力士樂電磁閥，REXROTH導(dǎo)軌，力士樂柱塞泵等產(chǎn)品
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