Gas venting valve for liquid tank
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United States of America Patent
Stats
-
Dec 12, 1989
Grant Date -
N/A
app pub date -
May 27, 1988
filing date -
May 27, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A venting valve (2) for a liquid tank, such as a vehicle fuel tank, has a float (64) confined in a cage (10). A valve element (86) is mounted on a mounting post (76, 78) carried by the top surface (72) of the float (64). The element (86) is pivotable about a horizontal axis (X). A rising liquid level in the cage (10) causes the float (64) to move upwardly and seat the valve element (86) against a valve seat (42). When the liquid level falls and the float (64) descends, the valve element (86) pivots on the mounting post (76, 78) and thereby acts as a lever to increase the effective weight of the float (64). This enables the lightweight float (64) to overcome vapor pressure in the tank and unseat the valve element (86). The valve of the invention may be incorporated into a cap (102) for closing a vehicle fuel tank filling and venting tube.
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