Drain valve

Details Drain valve Drain valve

2008-05-27

2008-05-27

Lee, Kevin (Department: 3753)

Fluid handling

Processes

C137S062000, C137S843000, C137S517000

Reexamination Certificate

active

07377286

ABSTRACT:
A drain valve having a temperature responsive member that holds the drain valve in a water conserving mode when water is above freezing yet allows the drain valve to drain when the water is near freezing to prevent freeze damage to the irrigation system.

REFERENCES:
patent: 4471906 (1984-09-01), Noguchi et al.
patent: 4699321 (1987-10-01), Bivens et al.
patent: 4821954 (1989-04-01), Bowder
patent: 5163779 (1992-11-01), King, Sr.
patent: 5692535 (1997-12-01), Walters
patent: 6102127 (2000-08-01), Pierce
patent: 6427712 (2002-08-01), Ashurst
patent: 7104461 (2006-09-01), Restivo et al.

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