| 摘要 |
A two-way valve for use in breathing apparatus comprising a valve chamber having a supply end and a mask end, both ends having openings, a valve plate member of thin lightweight material freely movable within the valve chamber between the supply end and the mask end for closing respective openings, the valve plate member defining a flow axis and a generally circular opening centered on the flow axis, a plurality of support arms extending radially inwardly from the perimeter of the circular opening, the support arms defining and being joined together at a solid central hub, a plurality of stub members extending radially inwardly from the perimeter of the circular opening, a fastening boss extending from the central hub towards the mask end of the chamber, retaining flanges on the boss spaced from the valve plate, a flat planar flexible valve membrane attached to the valve plate member, the membrane having a central opening fitting elastically over the boss, and fitting between the valve plate member and the flanges, the valve membrane normally closing the sector-shaped openings, and vents in the chamber being oriented and located so as to be closed by the valve plate member, when the valve plate member is located at the mask end, the vents being opened when the valve plate member is moved away from the mask end.
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