電磁閥里有密閉的(de)腔，在不(bu)(bu)(bu)同位置(zhi)開(kai)有通(tong)(tong)孔，每個孔連接不(bu)(bu)(bu)同的(de)油(you)管，腔中間(jian)是活(huo)塞，兩(liang)面(mian)是兩(liang)塊電(dian)磁鐵，哪面(mian)的(de)磁鐵線(xian)圈通(tong)(tong)電(dian) 閥體(ti)就(jiu)會被吸引(yin)到哪邊，通(tong)(tong)過控(kong)制(zhi)閥體(ti)的(de)移動(dong)來開(kai)啟或關閉不(bu)(bu)(bu)同的(de)排油(you)孔，而(er)進油(you)孔是常開(kai)的(de)，液壓油(you)就(jiu)會進入不(bu)(bu)(bu)同的(de)排油(you)管，然后(hou) 通(tong)(tong)過油(you)的(de)壓力來推動(dong)油(you)缸的(de)活(huo)塞，活(huo)塞又帶動(dong)活(huo)塞桿(gan)，活(huo)塞桿(gan)帶動(dong)機械(xie)裝置(zhi)。這(zhe)樣(yang)通(tong)(tong)過控(kong)制(zhi)電(dian)磁鐵的(de)電(dian)流通(tong)(tong)斷(duan)就(jiu)控(kong)制(zhi)了機械(xie)運動(dong)。