Aeration apparatus for a vertical riser in a vacuum drainage system

Year	Description
1999	Invention patented by Bjorn von Palffy, Douglas M. Wallace, and Jay D. Stradinger on September 15th, 1999. 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.
Source: selected by the editor from original sources.

Invention: Aeration apparatus for a vertical riser in a vacuum drainage system