Overfill prevention valve
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United States of America Patent
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Oct 6, 2015
Grant Date -
Dec 26, 2013
app pub date -
Feb 8, 2012
filing date -
Mar 16, 2011
priority date (Note) -
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Abstract
An overfill prevention valve includes: a valve housing having a first valve seat communicating with a fuel tank, and a second valve seat communicating with a canister; a parent valve disposed slidably within the valve housing, and having a base end opening communicating with a first opening, a front end opening communicating with a second opening and a third valve seat provided in the base end opening; a first urging unit which urges the parent valve toward the first valve seat; a child valve disposed slidably within the parent valve; a second urging unit which urges the child valve toward the third valve seat; and an air passage forming unit which forms an air passage between the parent valve and the first valve seat when the patent valve abuts on the first valve seat.
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