| 摘要 |
A warning valve having particular use in breathing apparatus comprising a chamber with a moveable valve body adapted to cooperate with a main valve seat in a feed line communicating with the chamber, characterized in that the feed line is connected to the chamber via on the one hand a main duct and on the other hand a bypass duct, the valve body being arranged so that in a first step it closes the main duct and in a second step it also closes the bypass duct.
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