| 摘要 |
An exhalation valve means of a positive pressure type respiration mask which can be easily converted to a non-positive pressure type (atmospheric pressure type) mask when necessary. The exhalation valve means includes a valve body unit, which comprises an exhalation value seat, a valve body supporting member which is detachably mounted within an exhalation valve chamber, and a valve body which is supported by said valve body supporting member and energized against said exhalation valve seat. Said valve seat has a means for mounting a rubber membrane valve body which is used for the valve body unit.
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