Breathing mask with exhalation valve

摘要

The breath protection mask (1) with breath exhale valve has circularly arranged valve seat (8) and sealing part (7) which is flexible and bowl shaped with one sealing diaphragm (7a) and edge (7b). The sealing diaphragm cooperates with valve seat to inhale against the side curved surface. The edge at inhale side supports the supporting surface (11) against the opposite side of sealing diaphragm.