Anti-syphon freezeless water hydrant
AssigneePrier Brass Manufacturing Co.
InventorsDaniel W. Pike, Phillip J. Crawley, John L. Marshall, Steve A. Martin
Life of this patent
Estimating the term…
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.
Claims18
In a water hydrant having an elongated tube provided with an inner housing having a cylindrical water inlet bore, an outer housing having a cylindrical air inlet bore and a laterally extending water outlet spout disposed inwardly of the air inlet bore, a rotatable stem reciprocable in the tube and the outer housing, terminating in an exterior operating member, and a plurality of stem-actuated valves including:
- a water valve connected to the stem in the inner housing for controlling the flow of water from the water inlet bore to the tube;
- an air valve connected to the stem in the outer housing for controlling the inflow of air and precluding outflow of water through the air inlet bore;
- and
- a check valve in the spout for precluding backflow of water into the outer housing,
- said air valve having means for opening the check valve during operation of said member.
Dependencies are inferred from the claim text.