電磁閥里有密閉(bi)的腔(qiang)，在不(bu)同(tong)位置(zhi)開(kai)(kai)有通(tong)(tong)(tong)孔，每(mei)個孔連接不(bu)同(tong)的油(you)管，腔(qiang)中間是活(huo)塞，兩面是兩塊電(dian)磁(ci)鐵(tie)(tie)，哪(na)(na)面的磁(ci)鐵(tie)(tie)線圈通(tong)(tong)(tong)電(dian) 閥體就(jiu)會(hui)被(bei)吸引到哪(na)(na)邊(bian)，通(tong)(tong)(tong)過(guo)(guo)控制閥體的移動來(lai)(lai)開(kai)(kai)啟或(huo)關閉(bi)不(bu)同(tong)的排油(you)孔，而進油(you)孔是常開(kai)(kai)的，液壓(ya)油(you)就(jiu)會(hui)進入不(bu)同(tong)的排油(you)管，然后 通(tong)(tong)(tong)過(guo)(guo)油(you)的壓(ya)力來(lai)(lai)推動油(you)缸的活(huo)塞，活(huo)塞又帶動活(huo)塞桿，活(huo)塞桿帶動機械裝置(zhi)。這樣通(tong)(tong)(tong)過(guo)(guo)控制電(dian)磁(ci)鐵(tie)(tie)的電(dian)流通(tong)(tong)(tong)斷就(jiu)控制了機械運動。