Anti-syphon freezeless water hydrant

Details Anti-syphon freezeless water hydrant Anti-syphon freezeless water hydrant

1981-10-16

1984-10-09

Michalsky, Gerald A.

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

137360, 13762526, 137801, F16K 2402

Patent

active

044755708

ABSTRACT:
A water hydrant is provided with a number of valves operable to eliminate freezing problems and to prevent backflow into potable water, thereby precluding the danger of contamination. Water and air valves operate in conjunction such that trapping of water in the hydrant is averted by the admission of air after each closing of the water valve. By a somewhat different arrangement in outlet spout valving, air is also admitted to the spout after each closing of the water valve or other reduction in water pressure, the spout valving having the additional feature of blocking backflow, all of which meets the anti-contamination requirements of the hydrant.

REFERENCES:
patent: 2810395 (1957-10-01), Simmons
patent: 2952270 (1960-09-01), Fulton et al.
patent: 3106935 (1963-10-01), Gatzke
patent: 3424189 (1969-01-01), Woodford
patent: 3459443 (1969-08-01), Butters et al.
patent: 3929150 (1975-12-01), Flinner et al.
patent: 3952770 (1976-04-01), Botnick
patent: 4316481 (1982-02-01), Fillman

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