Gas venting valve for liquid tank

Fluid handling – Diverse fluid containing pressure systems – Fluid separating traps or vents

Patent

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Details

220202, F16K 1736

Patent

active

048860891

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.

REFERENCES:
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patent: 4666058 (1987-05-01), Harris
patent: 4770201 (1988-09-01), Zakai
patent: 4781218 (1988-11-01), Mori et al.

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