二位二通常開電磁閥裏li有you密mi閉bi的de腔qiang，在zai不bu同tong位wei置zhi開kai有you通tong孔kong，每mei個ge孔kong連lian接jie不bu同tong的de油you管guan

，腔qiang中zhong間jian是shi活huo塞sai，兩liang麵mian是shi兩liang塊kuai電dian磁ci鐵tie，哪na麵mian的de磁ci鐵tie線xian圈quan通tong電dian閥fa體ti就jiu會hui被bei吸xi引yin到dao哪na邊bian，通tong過guo控kong製zhi閥fa體ti的de移yi動dong來lai開kai啟qi或huo關guan閉bi不bu同tong的de排pai油you孔kong，而er進jin油you孔kong是shi常chang開kai的de，液ye壓ya油you就jiu會hui進jin入ru不bu同tong的de排pai油you管guan，然ran後hou通tong過guo油you的de壓ya力li來lai推tui動dong油you缸gang的de活huo塞sai，活huo塞sai又you帶dai動dong活huo塞sai杆gan，活huo塞sai杆gan帶dai動dong機ji械xie裝zhuang置zhi。這zhe樣yang通tong過guo控kong製zhi電dian磁ci鐵tie的de電dian流liu通tong斷duan就jiu控kong製zhi了le機ji械xie運yun動dong。