| 摘要 |
A sealed enclosure is provided with a valve at least part of which extends inside the enclosure and is formed between two flexible sheets extending between two opposed edges of the enclosure and being connected along two non-converging connection lines to define therebetween a duct upon spacing apart the flexible sheets from one another to allow the passage of a fluid between the inside and the outside of the enclosure. The sheets are arranged to be applied against one another upon ceasing of the application thereto of a force tending to hold them apart, thus preventing said fluid from leaving the enclosure. The sheets are sealingly connected to one another with each of the non-converging connection lines forming said duct at the opposite edges of the enclosure, the edges of the sheets adjacent to the inlet end of the duct being sealingly connected to the wall of the enclosure. Therefore, the opposed edges of the enclosure between which the flexible sheets extend are assembled to one another such that the corresponding edges of these flexible sheets situated between the edges of the enclosure are, on the one hand, assembled to one another, and on the other hand, to the adjacent edges of the enclosure. Also, the connection of the edge adjacent to the inlet end of the duct, of at least one of said flexible sheets, is constituted by an assembly.
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