Fluid handling – Back flow prevention by vacuum breaking – Air vent in liquid flow line
Patent
1984-04-30
1985-09-03
Schwadron, Martin P.
Fluid handling
Back flow prevention by vacuum breaking
Air vent in liquid flow line
137893, 137897, 239310, 239399, 239589, F16K 1900
Patent
active
045386366
ABSTRACT:
An aspirator structure to proportionately mix a pressurized motive liquid and non-pressurized additive liquid and to deliver the mixed liquids into a storage supply of mixed liquids. The aspirator structure includes an elongate aspirating chamber connected with the supplies of motive and additive liquids and has a discharge end from which the mixed liquids flow. The structure next includes an elongate, vertical delivery tube with a cylindrical inside surface, a closed upper end portion communicating with the discharge end of the chamber and an open lower end opening in the supply of mixed liquids. The cross-sectional extent of the tube is greater than the cross-sectional extent of the chamber and the liquids flowing from the chamber are directed substantially tangentially with respect to the inside surface of the tube so that those liquids establish a vortex flow with and are moved downwardly therethrough by the force of gravity. The tube has an elongate radially opening circumferentially and longitudinally extending anti-syphon slot opening pitch counter to the vortex flow of liquids whereby those liquids flow substantially laterally across the opening within the tube.
REFERENCES:
patent: 1476589 (1923-12-01), Brown et al.
patent: 2551699 (1951-05-01), Parks
patent: 2625176 (1953-01-01), Williams et al.
patent: 2815248 (1957-12-01), O'Brien
patent: 3003705 (1961-10-01), Johnson
patent: 4218014 (1980-08-01), Tracy
patent: 4469137 (1984-09-01), Cleland
Hepperle Stephen M.
Maxwell Georges A.
Schwadron Martin P.
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