Fuel tank vent system and diaphragm valve for such system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jun 1, 1993
Issued Date -
N/A
app pub date -
Oct 7, 1991
filing date -
Jan 25, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fuel tank vent valve disposed between the tank and a carbon canister to provide high volume venting between the tank and the canister under normal operating conditions. A diaphragm type control element within the valve pulls an internal valve plate against a seat when the filler pipe cap is removed thereby to close off the vent between the tank and the canister. In one embodiment drainage throughbore is provided in the control element and valve plate to drain liquid fuel which might otherwise collect on and disable the diaphragm control element. In another embodiment the vent valve is provided with a reverse flow flap valve. In another embodiment the vent valve is provided with purge protection apparatus. The system operates with a filler pipe door seal of the type which is opened by the introduction of a filler nozzle. The vent valve is primarily constructed of molded plastic parts.
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