電磁閥里有(you)密閉(bi)(bi)的腔，在不(bu)同(tong)位(wei)置開有(you)通(tong)孔(kong)，每個孔(kong)連接不(bu)同(tong)的油(you)(you)管，腔中間是(shi)(shi)活塞(sai)，兩(liang)面(mian)是(shi)(shi)兩(liang)塊電(dian)磁鐵，哪(na)面(mian)的磁鐵線圈通(tong)電(dian) 閥(fa)體(ti)就會被(bei)吸引到哪(na)邊，通(tong)過(guo)控(kong)(kong)制(zhi)閥(fa)體(ti)的移動(dong)來開啟或關閉(bi)(bi)不(bu)同(tong)的排(pai)油(you)(you)孔(kong)，而進(jin)油(you)(you)孔(kong)是(shi)(shi)常開的，液壓油(you)(you)就會進(jin)入不(bu)同(tong)的排(pai)油(you)(you)管，然后 通(tong)過(guo)油(you)(you)的壓力來推動(dong)油(you)(you)缸的活塞(sai)，活塞(sai)又帶動(dong)活塞(sai)桿(gan)，活塞(sai)桿(gan)帶動(dong)機(ji)械裝置。這樣(yang)通(tong)過(guo)控(kong)(kong)制(zhi)電(dian)磁鐵的電(dian)流通(tong)斷就控(kong)(kong)制(zhi)了機(ji)械運動(dong)。