Two-stage ORVR control valve
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United States of America Patent
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-
Mar 27, 2001
Grant Date -
N/A
app pub date -
May 16, 2000
filing date -
Aug 24, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A refueling fuel level responsive control valve with a two-stage closing operation providing an initial soft shutoff cue to the filler nozzle operator, and a subsequent final shutoff after a limited amount of 'roundoff' filling to a maximum fuel level. The control valve includes two float-operated valve elements which dose serially in response to initial shutoff and final shutoff refueling fuel levels. The initial shutoff partially closes the control valve to create a temporary shutoff-inducing increase in fuel tank pressure. Final shutoff occurs after allowing a few round-off 'clicks' of the filler nozzle to fully close venting through the control valve.
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