Fluid handling – Line condition change responsive valves – Direct response valves
Reexamination Certificate
1999-07-27
2001-09-04
Rivell, John (Department: 3753)
Fluid handling
Line condition change responsive valves
Direct response valves
C137S854000, C137S592000, C251S075000
Reexamination Certificate
active
06283147
ABSTRACT:
The present invention relates to a non-return valve for a fuel tank.
BACKGROUND OF THE INVENTION
Such a valve is mounted at the end of the tube which is used for filling the tank, firstly to prevent the fuel that is present in the tank from being expelled in the event of pressure in the tank rising excessively, and secondly to reduce any risk of leakage in the event of an accident that has led to the tube being broken.
OBJECT AND SUMMARY OF THE INVENTION
The object of the present invention is to provide a novel non-return valve which is reliable and relatively low cost in structure.
The non-return valve of the invention includes a bistable closure member.
In other words, the closure member has a stable closed position and it can be moved into a likewise stable open position under the effect of the pressure of fuel in the filler tube.
Preferably, the closure member has an umbrella-configuration in the closed position and it passes to an inverted umbrella-configuration in the open position.
Return of the closure member into the closed position can take place, for example, under the effect of a wave of fuel in the tank.
By means of the invention, the tank can be filled at a relatively high rate, because while the fuel is passing through the valve it does not need to overcome a resilient return force tending to return the closure member into its closed position.
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patent: 0796602 (1997-09-01), None
Compagnie & Plastic Omnium
Rivell John
Schweitzer Cornman Gross & Bondell LLP
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