Single-stage fuel tank pressure control valve
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United States of America Patent
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-
Oct 14, 2003
Grant Date -
Jul 11, 2002
app pub date -
Aug 8, 2001
filing date -
Aug 8, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A valve structure that includes a housing, a valve element, and a seal. The housing includes a first communication path between a first port at a first pressure level and a second port at a second pressure level. The valve element is movable with respect to the housing between a first position, a second position, and an intermediate position between the first and second positions. The first position permits substantially unrestricted fluid flow between the first and second ports. The second position substantially prevents fluid flow between the first and second ports. The seal is located at an interface between the housing and the valve element. The seal deforms in response to a differential between the first and second pressure levels such that at the intermediate position, there is restricted fluid flow between the first and second ports.
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