美國歐可進口先導式電磁閥，由先導閥與主閥組成，兩者有通道相聯系，當電磁閥線圈通電，動鐵芯與靜鐵芯吸合使導閥孔開放，閥芯背腔的壓力通過導閥孔流向出口，此時閥芯背腔的壓力低于進口壓力，利用壓差使閥芯脫離主閥口，介質從進口流向出口。當線圈斷電，動鐵芯與靜鐵芯脫離，關閉了導閥孔，閥芯背腔壓力受進口壓力的補充逐漸趨于和進口平衡，閥芯因彈簧力作用下把閥門緊密關閉。
The United States of America Ou imports electromagnetic valve, a pilot valve and main valve, both of them have the channel connection, when the solenoid coil is energized, the movable iron core and the static iron core attracts the valve guide hole opening, the valve core cavity pressure through the pilot valve to the outlet when the valve core Kong Liu, back cavity pressure is lower than the inlet pressure, using the pressure differential valve from the inlet of the main valve, medium to flow from the inlet to outlet. When the coil is de-energized, the movable iron core and the static iron core from, off pilot valve hole, the valve core cavity pressure inlet pressure supplement tends gradually and import balance, spool due to spring force the valve tightly closed.
