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SMC流体阀介绍VCA20-12-1A：
下图是VCW系列的结构原理图。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。
VCA、VCB、VCL、VCS、VCW及VDW系列的工作介质比较单一，故阀的结构简单，体积和重量都比对应口径的VX系列要小而轻，价格也低些。
VXR2系列是SMC防水锤型二位二通先导式电磁阀，在IN侧没有压力或很低压力下，由于提升弹簧的反力使主阀芯开启，故称为零差压动作型，即zui低动作压力差为零。
VNA是一种正反方向都可以流动的平衡座阀式结构，有外部先导式电磁阀和气控阀两种。
| VCA20-12-1A | VCL23-5TL-2 | VCW32-4D-5-02-G | VX050-030 |
| VCA20-6A-1 | VCL30-9-1 | VCW32-4D-7-03 | VX050-033 |
| VCA21-1D-3-02 | VCL31-1G-5-03 | VCW32-4G-3-02 | VX050-034 |
| VCA21-1DL-5-02 | VCL31-3D-5-03 | VCW32-4G-5-02 | VX050-035 |
| VCA21-1G-3-02 | VCL31-3DL-7-03 | VCW32-4G-5-02-G | VX050-052 |
| VCA21-1G-3-02-F | VCL31-3G-7-02 | VCW32-4G-5-02N-G | VX050-053 |
| VCA21-1G-5-02 | VCL31-4D-10-03 | VCW32-5D-10-03-A-F | VX050-054 |
| VCA21-1G-5-02-F | VCL31-4D-10-04 | VCW32-5D-7-02F | VX050-056 |
| VCA21-2G-3-02 | VCL31-4D-10-04-D | VCW32-5G-5-03-L | VX050-066 |
| VCA21-3D-3-02 | VCL31-4D-3-02 | VCW33-5D-4 | VX060-007E |
| VCA21-3DL-3-02 | VCL31-4D-4-02 | VCW33-5G-4 | VX061-001PE |
| VCA21-3G-3-02 | VCL31-4D-4-03 | VCW34-5G-3 | VX070-012 |
| VCA21-3G-5-02-F | VCL31-4D-5-03 | VCW40-12-02 | VX070-020 |
| VCA21-4D-3-02 | VCL31-4D-7-02 | VCW40-12-06 | VX070-022 |
| VCA21-4D-3-02F | VCL31-4DL-5-03F | VCW40-4D | VX070-029 |
| VCA21-4D-3-02-F | VCL31-4G-10-03 | VCW41-1D-4-03-A-F-X7 | VX070-053 |
| VCA21-4D-5-02 | VCL31-4G-10-03-D | VCW41-1DL-10-06 | VX070-054 |
| VCA21-4DL-5-02-F | VCL31-4G-10-04 | VCW41-1DL-10-06-G | VX070-055 |
| VCA21-4G-3-02 | VCL31-4G-10-04-D | VCW41-1G-5-02-F | VX070-069-1 |
| VCA21-4G-3-02-F | VCL31-4G-10-04-H | VCW41-1G-6-03-X51 | VX070-069-2 |
| VCA21-4G-5-02 | VCL31-4G-10-04-N | VCW41-2G-10-04-L-F | VX2110-01-1D |
| VCA21-4G-5-02-F | VCL31-4G-3-02 | VCW41-2G-5-03 | VX2110-01-1D1 |
| VCA21-5D-3-02 | VCL31-4G-3-03 | VCW41-2TL-5-03 | VX2110-01-1D1-B |
| VCA21-5D-3-02-F | VCL31-4G-4-02 | VCW41-3D-10-06 | VX2110-01-1DZ-B |
| VCA21-5D-5-02 | VCL31-4G-4-03 | VCW41-3D-7-02-A | VX2110-01-1TZ-B |
| VCA21-5D-5-02F | VCL31-4G-4-03-D | VCW41-3DL-10-06 | VX2110-01-2G1-B |
| VCA21-5D-5-02-F | VCL31-4G-5-02 | VCW41-4C-10-04-G-F | VX2110-01-3D |
| VCA21-5DB-3-02-F | VCL31-4G-5-02-H | VCW41-4D-10-02-L-F | VX2110-01-3G1 |
| VCA21-5DL-3-02 | VCL31-4G-5-03 | VCW41-4D-10-03-C | VX2110-01-4D |
| VCA21-5DL-3-02-F | VCL31-4G-5-03-F | VCW41-4D-10-03-F | VX2110-01-4D1 |
| VCA21-5DL-5-02 | VCL31-4G-7-02 | VCW41-4D-10-03-L | VX2110-01-4DZ1 |
| VCA21-5DL-5-02-F | VCL31-4G-7-02-H | VCW41-4D-10-04 | VX2110-01-4G |
| VCA21-5DLB-3-02 | VCL31-4G-7-03-D | VCW41-4D-10-04G | VX2110-01-4G1 |
| VCA21-5G-3-02 | VCL31-4G-7-03-H | VCW41-4D-10-04-G | VX2110-01-4G-B |
| VCA21-5G-3-02F | VCL31-5D-10-03 | VCW41-4D-10-04-L-F | VX2110-01-5C1-B |
| VCA21-5G-3-02-F | VCL31-5D-10-04 | VCW41-4D-10-06 | VX2110-01-5D |
