Freeze safe valve

Details Freeze safe valve Freeze safe valve

2006-04-18

2008-12-02

Rivell, John (Department: 3753)

Fluid handling

Back flow prevention by vacuum breaking

Air vent in liquid flow line

C137S107000, C137S859000

Reexamination Certificate

active

07458388

ABSTRACT:
A freeze safe valve includes a housing coupled between an upstream tube and a downstream tube of a water flowing or supplying line for shutting off the water flowing or supplying line and for opening a drain port in response to the formation of ice on the downstream side of water flowing or supplying line, and thus for alleviating the pressure on the downstream side and for precluding or eliminating water damage from frozen, broken pipes, etc. A flexible valve member is disposed in the housing for selectively blocking the drain port of the housing by the fluid flowing into the housing and for selectively blocking the an orifice of a plate by a spring member.

REFERENCES:
patent: 3171423 (1965-03-01), Dillon
patent: 3850190 (1974-11-01), Carlson
patent: 4296770 (1981-10-01), Rice
patent: 4484594 (1984-11-01), Alderman
patent: 4522219 (1985-06-01), Ohkata
patent: 4909270 (1990-03-01), Enterante et al.
patent: 5388615 (1995-02-01), Edlund et al.
patent: 6857446 (2005-02-01), Hoeptner, III
patent: 2005/0178434 (2005-08-01), Yang

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