Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1984-08-21
1985-06-18
Nilson, Robert G.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
13754323, F16K 1506
Patent
active
045236070
ABSTRACT:
A backflow preventer apparatus designed for connection between a supply pipe having liquid under pressure and a service pipe, the backflow preventer apparatus comprising a pair of check valves in series and defining a zone therebetween, a relief valve operable upon a change in differential pressure across the upstream check valve, and a vacuum breaker operable upon a drop in pressure in the zone to a predetermined pressure supply above atmospheric pressure. The differential pressure operable relief valve, when opened upon certain operating conditions, causing the zone to drain to atmosphere. The vacuum breaker operates independent of supply pipe pressure or service pipe pressure but solely on a drop in pressure in the zone.
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Publication: "Handbook of Ross Connection Control", Edwin Reinecke, Copyrighted 1964 by Febco.
Daghe Joseph L.
Humes Dennis W.
Sands Robert E.
Mueller Co.
Nilson Robert G.
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