Aeration apparatus for a vertical riser in a vacuum drainage system
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United States of America Patent
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Oct 23, 2001
Grant Date -
N/A
app pub date -
Sep 16, 1999
filing date -
Sep 16, 1999
priority date (Note) -
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Abstract
A vacuum drainage system having a vertical riser with an aeration point. The aeration point prevents stalls in the vacuum drainage system by breaking up the formation of a solid fluid column in the riser. In certain applications, the aeration point allows the vacuum drainage system to operate in a deliberately flooded condition by regulating air flow into the riser. The aeration point may be provided simply as a hole positions at an optimum height above a bottom of the riser, or it may include apparatus for retaining fluid inside the riser, such as a check valve. In addition, the aeration point may be provided with an automatically adjustable cross-section, so that aeration point is quickly and easily adapted to changing operating parameters in the vacuum drainage system.
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