Backflow prevention and detection system

Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line

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Details

137107, 137554, E03C 110, F16K 3700

Patent

active

054253934

ABSTRACT:
A backflow prevention assembly is disclosed which provides for detection of backflow conditions. The backflow preventer assembly includes a housing having an inlet, an outlet and a discharge opening. A pair of independent check valves is positioned within the housing between the inlet and the outlet. The check valves are mechanically and hydraulically independent from each other and each adapted to seal the inlet from the outlet during backflow conditions. A relief valve is positioned within the housing between the check valves to selectively seal the discharge opening. An alarm is coupled to the relief valve to provide a signal when the relief valve is opened indicating backflow and discharge conditions.

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Z-3004SS Pressure-Tru Series 21/2" Automatic Fire Control Valves With Integral Supervisory Switch, Zurn Industries, Inc., Wilkins Regulator Div. (1 sheet) (undated).
3004-60SS Supervisory Switch, Zurn Industries, Inc., Wilkins Regulator Div. (1 sheet) (May 1991).
Zurn Pressure-Tru Pressure Reducing Fire Sprinkler & Fire Hose Valves, Zurn Industries, Inc., Wilkins Regulator Division (12 pp.) (undated).

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