Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1998-01-06
1999-08-17
Michalsky, Gerald A.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
137549, F16K 2712, E03C 110
Patent
active
059378891
ABSTRACT:
A vacuum breaker valve includes a body defining a liquid inlet and a liquid outlet and a vent cap structure having vent openings defining an air passage into the breaker element. A float element is slidably disposed on a float post within the breaker to move between a system sealing position and a venting position. The vent cap structure includes a riser structure having a vent wall in which the vent openings are formed and an external cap element. An air permeable water resistant barrier, which substantially prevents foreign debris from entering the piping system through the air passage, is operatively coupled to the vent cap or the body within the air passage. The barrier may be disposed within the riser structure beneath the cap element, may span a gap between the cap element and the riser structure, or may replace the cap element and be attached to the breaker over the riser structure.
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Wilkins (Member A.S.P.E.), Atmospheric Vacuum Breakers; Vacuum Breaker Valves, Sales Catalog, pp. 28, 33 (undated).
"Backflow Prevention Products, for Plumbing, Irrigation, Fire Protection and Waterworks", Watts Regulator, Water Products Division Safety & Control Valves, Catalog listing of Agents, C-BPD 9516, listing of parts, p. 3 (undated).
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