電磁閥里有密閉的(de)腔，在不(bu)(bu)同位置開(kai)有通(tong)(tong)(tong)孔，每個孔連接不(bu)(bu)同的(de)油(you)管，腔中間是(shi)活(huo)塞(sai)，兩面(mian)是(shi)兩塊電磁(ci)鐵，哪面(mian)的(de)磁(ci)鐵線(xian)圈通(tong)(tong)(tong)電 閥(fa)(fa)體就(jiu)(jiu)會(hui)(hui)被吸引到哪邊，通(tong)(tong)(tong)過控(kong)(kong)制(zhi)閥(fa)(fa)體的(de)移動來(lai)開(kai)啟或關閉不(bu)(bu)同的(de)排油(you)孔，而進(jin)油(you)孔是(shi)常開(kai)的(de)，液壓(ya)油(you)就(jiu)(jiu)會(hui)(hui)進(jin)入不(bu)(bu)同的(de)排油(you)管，然(ran)后(hou) 通(tong)(tong)(tong)過油(you)的(de)壓(ya)力(li)來(lai)推動油(you)缸的(de)活(huo)塞(sai)，活(huo)塞(sai)又帶動活(huo)塞(sai)桿，活(huo)塞(sai)桿帶動機(ji)械(xie)裝置。這樣通(tong)(tong)(tong)過控(kong)(kong)制(zhi)電磁(ci)鐵的(de)電流通(tong)(tong)(tong)斷就(jiu)(jiu)控(kong)(kong)制(zhi)了機(ji)械(xie)運動。