電磁閥里有(you)密閉的腔，在不(bu)(bu)同(tong)位(wei)置開有(you)通(tong)孔，每個孔連(lian)接不(bu)(bu)同(tong)的油(you)管，腔中間是活(huo)塞(sai)，兩面(mian)是兩塊電磁鐵，哪面(mian)的磁鐵線圈通(tong)電 閥體就(jiu)會被(bei)吸引到哪邊，通(tong)過控(kong)制(zhi)(zhi)閥體的移(yi)動來(lai)開啟或(huo)關閉不(bu)(bu)同(tong)的排油(you)孔，而進油(you)孔是常開的，液壓(ya)油(you)就(jiu)會進入不(bu)(bu)同(tong)的排油(you)管，然后 通(tong)過油(you)的壓(ya)力來(lai)推動油(you)缸的活(huo)塞(sai)，活(huo)塞(sai)又帶動活(huo)塞(sai)桿(gan)，活(huo)塞(sai)桿(gan)帶動機械(xie)裝置。這樣通(tong)過控(kong)制(zhi)(zhi)電磁鐵的電流通(tong)斷就(jiu)控(kong)制(zhi)(zhi)了(le)機械(xie)運動。