Patent Number: 6,305,403

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

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.

Inventors: von Palffy; Bjorn (South Beloit, IL), Wallace; Douglas M. (Roscoe, IL), Stradinger; Jay D. (Roscoe, IL)

Assignee: Evac International Oy

International Classification: E03F 1/00 (20060101); F04F 003/00 ()

Expiration Date: 10/23/2018