Temperature and pressure relief apparatus for water heater

Liquid heaters and vaporizers – Stand boiler – And condition responsive feature

Reexamination Certificate

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Details

C122S014310, C122S014100, C122S013010, C137S072000, C137S074000

Reexamination Certificate

active

07392766

ABSTRACT:
A liquid heating appliance, representatively a water heater, is provided with protective apparatus for preventing rupture of its liquid storage tank portion caused by overheating of pressurized liquid therein. Illustratively, the protective apparatus includes a length of thermoplastic tubing, preferably polybutylene tubing, whose interior is exposed to the tank interior so as to be pressurized by heated liquid therein. In the event of a liquid overheating condition in the tank, the tubing is heat-softened in a manner reducing its burst pressure and causing it to burst, at a pressure substantially below the tank burst pressure, and thereby form a pressure relief outlet passage for the tank. A shield structure with at least one fluid outlet opening therein extends outwardly around the thermoplastic tubing to diffuse pressurized fluid escaping from the burst tubing.

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patent: 6698386 (2004-03-01), Hoffman
patent: 6866057 (2005-03-01), Buehrle, II
patent: 6898373 (2005-05-01), Jackson

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