Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1997-09-17
1999-01-19
Michalsky, Gerald A.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
1372161, E03C 112
Patent
active
058604448
ABSTRACT:
A backflow prevention device for connection between an equipment liquid drain line and a sewer connection, the device being operable to prevent backflow of sewer waste into the equipment, comprising: an inlet opening at its upper portion, the inlet opening being connected to the drain pipe of the equipment; b) an outlet opening at its lower portion, the outlet opening being connected to the sewer; c) an arcuate liquid flow conduit, including a discharge opening, in liquid flow communication with the inlet opening for receiving inlet waste flow therefrom and redirecting and discharging it through the discharge opening in a downward vertical direction; d) a tubular liquid flow conduit in liquid flow communication with the outlet opening, the tubular flow conduit having an axial opening extending vertically therethrough and including an upper rim surrounding the axial opening; and e) a vertical connector on the tubular liquid flow conduit for supporting the arcuate liquid flow conduit in vertical spaced relationship therewith with the discharge opening of the arcuate liquid flow conduit vertically spaced a predetermined distance from the upper rim of the tubular flow conduit and the center of the discharge opening vertically aligned with the center of the axial opening. Preferably, the arcuate liquid flow conduit comprises an arcuate pipe segment having a substantially horizontal inlet segment, a substantially vertical discharge segment and an elbow interconnecting the inlet and discharge segments for redirecting inlet liquid waste flow through an arc of about ninety degrees.
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Guendjoian Armen
Guendjoian Beth
Friedman Stuart J.
Michalsky Gerald A.
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