Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Reexamination Certificate
2005-12-05
2008-08-12
Fristoe, Jr., John K. (Department: 3753)
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
C251S334000, C251S210000
Reexamination Certificate
active
07409964
ABSTRACT:
In a valve, the combination comprising a valve chamber, having a flow inlet and a flow outlet, a valve operator outside the chamber, a stopper in the chamber and operatively connected with the operator for movement toward and away from seat structure in the chamber, to control flow from the valve via the outlet, and the seat structure including first and second seats, the stopper located to seat on the first seat. there being a flexible sealing lip carried by the stopper to sealingly engage the second seat when the stopper sets on the first seat. Relatively movable parts define said operative connection, with configuration and relative movement to allow air inflow to break back siphonage of liquid, and to allow back pressure relief via drain passages.
REFERENCES:
patent: 1847385 (1932-03-01), Dengler
patent: 3054422 (1962-09-01), Napolitano
patent: 3929150 (1975-12-01), Flinner et al.
patent: 4209033 (1980-06-01), Hirsch et al.
patent: 4254792 (1981-03-01), Schadel
patent: 5752542 (1998-05-01), Hoeptner, III
patent: 6769446 (2004-08-01), Ball et al.
Fristoe Jr. John K.
Haefliger William W.
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