| 摘要 |
The present invention relates to a shut-off valve of limiting flow to a single direction, and a shut-off valve of removing air from the sack and charging the sack with air as well. The shut-off valve has an air passage of a flat and substantially cylindrical form in cross section, which is formed by opposed cladding sheets. The cladding sheet is provided with a valve body sheet which comprises a fixed part attached to the cladding sheet and flap portions with the fixed part placed in the central position therebetween, which flap portions are movable in a vertical direction. One flap portion serves to prevent air from flowing in one direction within the air passage by the close contact with cladding sheet, while the other flap portion serves to prevent air from flowing in the other direction by the close contact with the cladding sheetu The shut-off valve may perform a double function of removing air from the sack and charging the sack with air accordingly.
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