Backflow preventer
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United States of America Patent
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-
Oct 31, 2006
Grant Date -
Apr 13, 2006
app pub date -
Oct 7, 2004
filing date -
Oct 7, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A backflow assembly including a housing with a passage having at least one check valve positioned therein to permit fluid flow in one direction while preventing fluid flow in the reverse direction. The check valve includes a valve head connected to a stem having an outer surface. A hump extends radially outward from the outer surface of the stem. The stem is guided by a bushing during opening and closing of the valve. The bushing includes at least one retention member that moves along the outer surface of the stem during opening and closing of the valve. The interaction between the retention member and the hump on the outer surface of the stem causes a higher friction loss during opening and closing of the valve than other portions of the outer surface.
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