原理：通電時，電磁力把先導孔打開，上腔室壓力迅速下降，在關閉件週圍形成上低下高的壓差，流體壓力推動關閉件向上移動，閥門打開；斷電時，彈簧力把先導孔關閉，入口壓力通過旁通孔迅速腔室在關閥件週圍形成下低上高的壓差，流體壓力推動關閉件向下移動，關閉閥門。特點：流體壓力範圍上限較高，可任意安裝（需定製）但必須滿足流體壓差條件。2.電磁閥從閥結構和材料上的不同與原理上的區別，分為六個分支小類：直動膜片結構、分步直動膜片結構、先導膜片結構、直動活塞結構、分步直動活塞結構、先導活塞結構。
4V210,4V310,4V410,4V120,4V220,4V320,4V420,4V130,4V230,4V330,4V430-M54A210,4A220,4A310,4A320,4A410,
4A420,3V1,3V210,3V210-08,3V110-M5,3V310-08,3V210-08,3V120-M6,3V110-06,3A110-M5,3A110-M6,3A110-06,3A210-06,
3A210-08,3A210-M5,3V130-06P,3V130-06,3V130-06D,3V130-06AC110V,3V130-08,3V130-10,3V130-153V120-06,3V120-08,
3V120-10,3V120-15,3V110-06,3V110-08,3V110-10,3V110-15,3V210-06,3V210-08,3V210-10,3V210-15,3V220-06,3V220-08,
3V220-10,3V220-15,3V230-06,3V230-08,3V230-10,3V230-15,3V310-06,3V310-08,3V310-10,3V310-15,3V320-06,3V320-08,
3V320-10,3V320-15,3V330-06,3V330-08,3V330-10,3V330-15,3V410-06,3V410-08,3V410-10,3V410-15,3V420-06,3V420-08,
3V420-10,3V420-15,3V430-06,3V430-08,3V430-10,3V430-15,4V130-06P,4V130-06,4V130-06D,4V130-06AC110V,4V130-08,
4V130-10,4V130-154V120-06,4V120-08,4V120-10,4V120-15,4V110-06,4V110-08,4V110-10,4V110-15,4V210-06,4V210-08,
4V210-10,4V210-15,4V220-06,4V220-08,4V220-10,4V220-15,4V230-06,4V230-08,4V230-10,4V230-15,4V310-06,4V310-08,
4V310-10,4V310-15,4V320-06,4V320-08,4V320-10,4V320-15,4V330-06,4V330-08,4V330-10,4V330-15,4V410-06,4V410-08,
4V410-10,4V410-15,4V420-06,4V420-08,4V420-10,4V420-15,4V430-06,4V430-08,4V430-10,4V430-15 3V1-M5,3V1-06,3V110-M5,3V120-M5,3V110-06,3V120-06,3V210-06,3V220-06,3V210-08,3V220-08,3V310-08,
3V320-08,3V310-10,3V320-10,4V110-M5,4V120-M5,4V130C-M5,4V130E-M5,4V130P-M5,4V110-06,4V120-06,4V130C-06,
4V130E-06,4V130P-06,4V210-06,4V220-06,4V230C-06,4V230E-06,4V230P-06,4V210-08,4V220-08,4V230C-08,4V230E-08,
4V230P-08,4V310-08,4V320-08,4V330C-08,4V330E-08,4V330P-08,4V310-10,4V320-10,4V330C-10,4V330E-10,4V330P-10,
4V410-15,4V420-15,4V430C-15,4V430E-15,4V430P-15,2V025-06,2V025-08,2V130-10,2V130-15,2V250-20,2V250-25,3A110-M5,
3A120-M5,3A110-06,3A120-06,3A210-06,3A220-06,3A210-08,3A220-08,3A310-08,3A320-08,3A310-10,3A320-10,4A110-M5,
4A120-M5,4A130C-M5,4A130E-M5,4A130P-M5,4A110-06,4A120-06,4A130C-06,4A130E-06,4A130P-06,4A210-06,4A220-06,
4A230C-06,4A230E-06,4A230P-06,4A210-08,4A220-08,4A230C-08,4A230E-08,4A230P-08,4A310-08,4A320-08,4A330C-08,
4A330E-08,4A330P-08,4A310-10,4A320-10,4A330C-10,4A330E-10,4A330P-10,4A410-15,4A420-15,4A430C-15,4A430E-15,
4A430P-15,4H210-06,4H210-08,4H310-08,4H310-10
