| 摘要 |
The present invention relates to a valve device (10) comprising a substrate (12) and an elastic membrane (13), the membrane being joined at least around a valve area to the substrate. The substrate comprises a first channel (16) and a second channel (17), both ending in the valve area, the first channel having in the valve area a first channel end surface (19) and the second channel having in the valve area a second channel end surface (21), wherein the area of the first channel end surface is substantially larger than the area of the second channel end surface.
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