原理：通電時，電磁力把先導(dǎo)孔打開，上腔室壓力迅速下降，在關(guān) 閉件周圍形成上低下高的壓差，流體壓力推動關(guān)閉件向上移動，閥門打開；斷電時，彈簧力把先導(dǎo)孔關(guān)閉，入口壓力通過旁通孔迅速腔室在關(guān)閥件周圍形成下低上高的壓差，流體壓力推動關(guān)閉件向下移動，關(guān)閉閥門。

臺灣YIYANG電磁閥部分型號如下：

SWG-02-3C2-LW-A5 SWG-02-3C3-LW-A5 SWG-02-3C4-LW-A5 SWG-02-3C5-LW-A5 

SWG-02-3C7-LW-A5 SWG-02-3C8-LW-A5 SWG-02-3C9-LW-A5 SWG-02-3C60-LW-A5

SWG-02-2D2-LW-A5 SWG-02-2B2-LW-A5 SWG-02-2B3-LW-A5 SWG-02-2B8-LW-A5

SWG-02-3C2-DL-A5 SWG-02-3C3-DL-A5 SWG-02-3C4-DL-A5 SWG-02-3C5-DL-A5 

SWG-02-3C7-DL-A5 SWG-02-3C8-DL-A5 SWG-02-3C9-DL-A5 SWG-02-3C60-DL-A5

SWG-02-2D2-DL-A5 SWG-02-2B2-DL-A5 SWG-02-2B3-DL-A5 SWG-02-2B8-DL-A5 

SWG-02-2B2B-LW-A5  SWG-02-2B3B-LW-A5