气动元件的工作介质通常是压缩空气。SMC流体阀是指通过阀的工作介质除空气（包括真空状态）及氩气、氮气、氦气等惰性气体外，还可以是水、油、蒸汽等多种液体和气体。
当然，不同的系列允许通过的工作介质是不同的

SMC-VCW系列－－水用直动式2通电磁阀 。
对于N.C.型，电磁线圈3不通电时，阀芯关闭IN口与OUT口。
当电磁线圈通电时，动铁心组件4a克服复位弹簧6的弹簧力，被静铁心2所被吸引，IN口与OUT开启。
N.C.型的图形符号表示，在不通电时，IN口至OUT口是封闭的，但若OUT口与IN口对换，则不能封闭。
常用型号

VCW20-12-01

VCW21-6G-2-02

VCW21-6G-3-01

VCW22-4G302X162

VCW22-5G-4-01

VCW22-5G-4-02

VCW22-5G-5-02

VCW2211G302X162

VCW23-BDO-2

VCW21-6G-5-02-A

VCW21BG401AC24V

VCW212DL402AF35

VCW215DL201AF35

VCW215DL402LF35

VCW22-1G-2

VCW21-5D-3-01-L

VCW21-5D-4-01

VCW21-5G-3-02

VCW21-5G-4-01

VCW21-1G502X51B

VCW21-2D-4-02

VCW21-6G-3-02

VCW23-BDO-5

VCW23-5DL-3

VCW23-5DL-3AX35

VCW23-5G-3

VCW30-12-02

VCW30-3D

VCW30-3G

VCW30-4D

VCW21-6G-4-01

VCW21-6G-4-02

VCW21-6G-4-02-A

VCW21-6G-5-01

VCW21-6G-5-02

VCW30-12-02A

VCW30-12-04

VCW30-12-04A

VCW20-12-01A

VCW20-3D

VCW21-2D402X154

VCW21-2D402X38A

VCW21-3G-2-01

VCW21-3G-2-02

VCW21-3G-3-01

VCW20-6G

VCW21-BD-2-01

VCW21-5G-4-01-H

VCW21-5G-4-01-K

VCW21-5G-4-02

VCW21-BDO302FAQ

VCW21-3G-3-02

VCW21-3G-4-01

VCW21-3G-4-02

VCW20-3G

VCW20-4D

VCW20-4G

VCW20-5D

VCW20-5G

VCW20-6D

VCW21-1D-2-01-F

VCW21-1G-2-01

VCW21-4G-5-02-C

VCW21-4G-5-02-J

VCW21-4D-4-02

VCW21-4D-5-02

VCW21-4D-5-02-C

VCW21-4D-5-02-K

VCW21-4G-2-01

VCW21-4G-2-02

VCW21-4G-2-02-L

VCW21-4G-3-01

VCW21-4G-3-01-G

VCW21-4G-3-01-K

VCW21-4G-3-02

VCW21-4G-5-02-K

VCW21-4T-4-02

VCW21-5D-2-01

VCW21-5D-2-02-B

VCW21-3G-5-01

VCW21-3G-5-02

VCW21-4D-2-02

VCW21-4D-3-02-C

VCW21-5G-3-01

VCW21-5T-5-02-H

VCW21-5T501AX35

VCW21-6G-2-01

VCW22-1G302X162

VCW22-4D-2-01

VCW21-4G-3-02-A

VCW21-4G-4-01

VCW21-4G-4-02

VCW21-4G-4-02-A

VCW21-4G-4-02-G

VCW21-4G-4-02-K

VCW21-4G-5-01

VCW21-4G-5-01-A

VCW21-4G-5-02

VCW21-5G-4-02-C

VCW21-5G-4-02-K

VCW21-5G-5-01

VCW21-5G-5-02

VCW21-5G-5-02-F

VCW21-5G-5-02-K

VCW21-5G501AX35

VCW21-5D-5-02

VCW21-5G-2-01

VCW21-5G-2-01-A

VCW21-5G-2-01-C

VCW21-5G-2-01CQ

VCW21-5G-2-02

VCW21-5G-2-02-G

VCW22-4G-2-01

VCW22-4G-2-01-F

VCW22-4G-2-01F

VCW22-4G-2-01NF

VCW22-4G-2-02

VCW22-4G-2-02NF

VCW30-4G

VCW30-5D

VCW30-5G