Anti-syphon freezeless water hydrant
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United States of America Patent
Stats
-
Oct 9, 1984
Grant Date -
N/A
app pub date -
Oct 16, 1981
filing date -
Oct 16, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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