Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1995-07-21
1996-10-15
Michalsky, Gerald A.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
137853, E03C 110
Patent
active
055644600
ABSTRACT:
A vacuum breaker assembly includes an outlet tube having circumferential air ports and a vacuum breaker sleeve formed of a flexible elastomeric material positioned within the outlet tube. Conventionally, a stiffening funnel will be positioned within the vacuum breaker sleeve. The elastomeric sleeve has an inlet end and an outlet end and is located within the outlet tube adjacent the spaced air ports. The vacuum breaker sleeve has lip seals in the interior intermediate the inlet and outlet ends, with the lip seals opening in response to water pressure at the inlet end to permit water to pass through the vacuum breaker assembly. There are peripherally spaced projections on the exterior of the vacuum breaker sleeve adjacent the outlet end to space the exterior of the sleeve from the outlet tube. There is a tapered lip seal extending axially from the outlet end of the vacuum breaker sleeve, with the lip seal being downstream of the spacing projections. The tapered lip seal is outwardly movable into closing contact with the outlet tube in response to back pressure downstream of the vacuum breaker assembly, such closing contact preventing water flow through the air ports of the outlet tube.
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Gronwick Jerry P.
Wilson John R.
Michalsky Gerald A.
Sloan Valve Company
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