在的不同位置開有通孔，每個孔都通向不同的油管，腔中間是閥，兩面是兩塊電磁鐵，哪面的磁鐵線圈通電閥體就會被吸引到哪邊，通過控制閥體的移動來檔住或漏出不同的排油的孔，而進油孔是常開的，液壓油就會進入不同的排油管，然后通過油的壓力來推動油剛的活塞，活塞又帶動活塞桿，活塞竿帶動機械裝置動。這樣通過控制電磁鐵的電流就控制了機械運動。

     它是一種直動和先導(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)入口與出口達到啟動壓差時，通電后，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。 

    SCG553A018MS

    SCG353A047 220/50

    SCG353A047 24VDC

    SCG353A051 230/50

    SCG531D001MS 230/50

    SCG531D001MS 24VDC 

    EF8262G212 115/50

    8262G014 24VDC

    8210G004 24VDC

    8223G027 24VDC

    8263G205LT 220/50

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    8320G174 220/50

    8320G174 24VDC

    EF8320G174 220VAC

SCG553A018MS

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    EF8320G184 220VAC

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    8320G186 24VDC

    8320G186 220/50 

    EF8320G186 24VDC

    EF8320G186 220/50

    EF8320G203 24VDC

    EF8320G203V 24VDC

    EF8314G054 24VDC

SCG551A002MS 24VDC

    SCG551A002MS 230/50

    EFG551H401MO 24VDC

    EFG551H401MO 220/50

    EFG551A001MS 220/50

    EFG551A001MS 24VDC

    SCG353A043 230/50

    SCG353A043 24VDC

    SCG353A044 230/50