Anti-freezing hydrant

Details Anti-freezing hydrant Anti-freezing hydrant

2008-02-28

2010-02-02

Lee, Kevin L (Department: 3753)

Fluid handling

Hydrant type

Protection against freezing

C137S062000, C137S060000

Reexamination Certificate

active

07654280

ABSTRACT:
An anti-freezing hydrant is provided with a hollow valve rod of which a back end is provided with a lump formed with an oblique cone where a water leakage hole is formed communicating with the valve rod. A one-way valve is provided in a inner water inlet in a valve chamber of a valve and comprises a rubber cushion being made of a soft rubber and thus elastically suppressing the inner water inlet. The bore of a back pressure stopper in a back pressure is a complement of an inner inclined cone with the oblique cone. Thus, the rubber cushion may enhance the capability of sealing of the valve. Further, the back pressure stopper may also be a good sealant for the inclined cone.

REFERENCES:
patent: 6805154 (2004-10-01), Dickey et al.
patent: 6857442 (2005-02-01), Ball et al.

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