Air admittance valve for use in drainage systems
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United States of America Patent
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Sep 19, 1989
Grant Date -
N/A
app pub date -
Jun 23, 1988
filing date -
Feb 11, 1987
priority date (Note) -
Expired
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Abstract
An air admittance valve for use in drainage systems comprising a housing with an opening therein through which air passes into the drainage system, and a pivoted closure member adapted to close the opening and openable on a pressure difference between the system and the exterior.
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