Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1993-12-15
1995-06-20
Michalsky, Gerald A.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
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).
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Michalsky Gerald A.
Zurn Industries, Inc.
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