電磁閥里有(you)密閉的(de)(de)腔，在不(bu)同(tong)(tong)(tong)位(wei)置開有(you)通(tong)(tong)孔(kong)，每個孔(kong)連(lian)接不(bu)同(tong)(tong)(tong)的(de)(de)油(you)管(guan)，腔中間(jian)是活(huo)塞(sai)(sai)，兩(liang)面是兩(liang)塊電磁(ci)鐵，哪(na)面的(de)(de)磁(ci)鐵線圈通(tong)(tong)電 閥(fa)體(ti)就(jiu)會(hui)被吸引(yin)到哪(na)邊，通(tong)(tong)過(guo)控(kong)制閥(fa)體(ti)的(de)(de)移動(dong)來開啟或(huo)關閉不(bu)同(tong)(tong)(tong)的(de)(de)排(pai)油(you)孔(kong)，而進油(you)孔(kong)是常(chang)開的(de)(de)，液壓油(you)就(jiu)會(hui)進入不(bu)同(tong)(tong)(tong)的(de)(de)排(pai)油(you)管(guan)，然后(hou) 通(tong)(tong)過(guo)油(you)的(de)(de)壓力來推動(dong)油(you)缸的(de)(de)活(huo)塞(sai)(sai)，活(huo)塞(sai)(sai)又帶動(dong)活(huo)塞(sai)(sai)桿，活(huo)塞(sai)(sai)桿帶動(dong)機(ji)(ji)械裝置。這樣通(tong)(tong)過(guo)控(kong)制電磁(ci)鐵的(de)(de)電流通(tong)(tong)斷就(jiu)控(kong)制了機(ji)(ji)械運動(dong)。