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US 4,444,219 AGranted
Overpressure valve for packages with flexible walls
AssigneeWipf AG Verpackungen
InventorErwin B. Hollenstein
Life of this patent
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AssigneeWipf AG Verpackungen
InventorErwin B. Hollenstein
Estimating the term…
The present invention is with respect to an overpressure valve for packages with flexible walls, having a valve body able to be fluid-tightly joined with such a package. The valve body has a flat valve seat having thereon a diaphragm with a valve shutting part. In the seat there are valve openings, each having a number of concentric ring-like channels round it in the seat. The concentric channels take up a sealant, more specially silicone oil. The diaphragm is made of a single piece of material running on one side of the walls to the other without any holes therein. It is only kept in position in a middle part of the valve seat so that the diaphragm may be moved freely, at least over the valve openings. In the case of a preferred form of the invention, the diaphragm is slipped loosely into the valve body in which it is kept in position by a keeper in a middle part thereof. The keeper may be fixed in position by friction or by a keying effect.
In an overpressure valve for a flexibly walled package, having a valve body designed to be fixed air-tightly in said wall and an elastic diaphragm in said body placed so that valve openings in said valve body are shut by said diaphragm resting against a valve seat of said body, said openings in said seat being at the ends of holes stretching through said body from said seat to an opposite side of said body, the invention residing in that each of the valve openings in the valve seat at the ends of said holes running through said body has at least two concentric channels placed around it in the valve seat, such channels having a sealant therein, said diaphragm being generally free of any hole and being supported at a middle part thereof against said valve seat, whereas parts of said diaphragm next to said valve openings are able to be freely winged towards away from said seat.
Dependencies are inferred from the claim text.