Backflow prevention valve

Details Backflow prevention valve Backflow prevention valve

2005-12-06

2005-12-06

Rivell, John (Department: 3753)

Fluid handling

Line condition change responsive valves

Direct response valves

C137S538000, C137S543210, C137S592000

Reexamination Certificate

active

06971406

ABSTRACT:
A backflow prevention valve includes a cylindrical case member having a plurality of holes formed in an upper end at a periphery thereof, a valve member disposed in the case member to be movable in an axial direction thereof, an urging device disposed in the case member for urging the valve member upwardly, and a liquid inflow pipe extending outwardly from the case member. The valve member includes a sealing portion at an upper surface thereof for contacting a peripheral edge of an inflow opening to close the same, and a plurality of guiding arms provided on a peripheral edge of an upper surface of the valve member. The guiding arms are slidably disposed in the holes so that the valve member is supported and guided by the guiding arms passing through the holes.

REFERENCES:
patent: 765541 (1904-07-01), Beers
patent: 1976849 (1934-10-01), Hewitt
patent: 2366004 (1944-12-01), Crittenden
patent: 5546981 (1996-08-01), Li et al.
patent: 5660206 (1997-08-01), Neal et al.
patent: 5794657 (1998-08-01), Oberg
patent: 6012599 (2000-01-01), Miura et al.
patent: 6240957 (2001-06-01), Hattori
patent: 6253788 (2001-07-01), Palvolgyi
patent: 6260578 (2001-07-01), Kuehnemund et al.
patent: 6283147 (2001-09-01), Rosseel
patent: 6340031 (2002-01-01), Matsumoto et al.
patent: 6470911 (2002-10-01), Miura et al.

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