Fluid handling – Line condition change responsive valves – Direct response valves
Reexamination Certificate
1998-04-13
2001-02-06
Rivell, John (Department: 3753)
Fluid handling
Line condition change responsive valves
Direct response valves
C137S512000, C604S083000, C604S247000
Reexamination Certificate
active
06182698
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to valve assemblies for liquid transfer.
SUMMARY OF THE INVENTION
In accordance with the invention there is provided a valve assembly for liquid transfer, comprising a liquid inlet, a liquid outlet and a valve member disposed between the inlet and outlet; the valve member comprising a resilient membrane separating between the inlet and the outlet, the membrane having one or more holes; in a state where there is no pressure difference between the membrane's two sides, the walls of the one or more holes are collapsed and no liquid can pass therethrough, and in a certain threshold level, the stretching of the membrane causes opening of the one or more holes to allow liquid to pass from one side of the membrane to the other.
In accordance with an embodiment of the invention, the valve is of the one-way type allowing fluid transfer only in one direction.
In accordance with another embodiment of the invention, the valve assembly comprises an auxiliary member whereby the membrane can be stretched manually to bring to opening of the one or more holes.
The pressure threshold is determined by the thickness and surface area of the resilient member and the size of said one or more holes.
By still another embodiment of the invention, the valve assembly comprises a piercing member for piercing the membrane so as to create at least one hole therein, the at least one hole being of the kind defined above.
By another aspect of the present invention there is provided a fluid valve assembly consisting of a first valve assembly and a second valve assembly, each of the first and second valve assemblies being independently selected from the group consisting of a valve assembly according to any one of the proceeding claims, wherein a liquid outlet of said second valve assembly is in flow communication with a liquid inlet of said first valve assembly.
The invention will now be illustrated in the following non-limiting specific embodiments with particular reference to the annexed drawings.
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Bell Boyd & Lloyd LLC
Rivell John
Societe des Produits Nestle SA
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