Air admittance valve
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United States of America Patent
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-
Jul 8, 2008
Grant Date -
N/A
app pub date -
Feb 16, 2005
filing date -
Feb 16, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In some embodiments, an air admittance valve includes a base, a screen plate and a diaphragm engageable with the screen plate. The diaphragm may include a first center disk having a stem and a membrane coupled to the first center disk. The membrane may have a continuous material sized to extend beyond a perimeter of the first center disk, be formed of a material more pliable than the first center disk and be adapted to be coupled to the first center disk through the center disk stem.
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