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A one-way degassing valve is used for aromatic products, such as coffee and the like, comprising a valve body, a valve element and a selective type filter, preferably consisting of activated charcoal which allows the passage of low molecular weight gases, such as carbon dioxide, and retains the high molecular weight gases that constitute the product's aroma. one-way valves are normally applied to the upper wall of the container and its purpose is to allow the gases developed by the coffee to escape from the container. The one-way valves used at present serve this purpose perfectly, opening when slight internal overpressures occur and closing immediately when they cease.