Backflow prevention valve

Fluid handling – Line condition change responsive valves – Direct response valves

Reexamination Certificate

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Details

C137S538000, C137S592000, C251S357000

Reexamination Certificate

active

06978801

ABSTRACT:
A backflow prevention valve includes a cylindrical case member with an inflow opening at one end and an outlet at the other end or a peripheral surface or both, and a valve member contacting a peripheral edge of the inflow opening for closing the inflow opening. An urging device urges the valve member toward the inflow opening, and a liquid inflow pipe is connected to the inflow opening from outside the case member. The liquid inflow pipe has a smooth inner surface without unevenness, and is attached to a fuel supply pipe inside the fuel tank. When the fuel is supplied, the valve member moves against an urging force of the urging device due to a fuel pressure, so that the inflow opening opens.

REFERENCES:
patent: 1707017 (1929-03-01), Kibele
patent: 1800185 (1931-04-01), Thrush
patent: 1916766 (1933-07-01), Lytel
patent: 2185103 (1939-12-01), Heigis
patent: 2797704 (1957-07-01), McDermott et al.
patent: 2800142 (1957-07-01), Champion
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patent: 3036594 (1962-05-01), Salisbury
patent: 3358770 (1967-12-01), Myron
patent: 3511475 (1970-05-01), Pfau
patent: 4815493 (1989-03-01), Miller et al.
patent: 5546981 (1996-08-01), Li et al.
patent: 5568828 (1996-10-01), Harris
patent: 5794657 (1998-08-01), Oberg
patent: 6012599 (2000-01-01), Miura et al.
patent: 6340031 (2002-01-01), Matsumoto et al.
patent: 6648016 (2003-11-01), Farrenkopf et al.

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