One-way valve

A one-way valve intended particularly for food packages, said valve designed to be fitted on a package and arranged to open in response to an excess pressure inside said package, said one-way valve being recloseable, and having an aperture formed in the package material, on top of which aperture an adhesive sheet is arranged, said adhesive sheet arranged to uncover the aperture when exposed to pressure loads, and wherein the valve is made recloseable using the adhesive sheet which may be opened and closed repeatedly, the adhesive sheet itself being arranged to emit a sound signal when the valve is open and an excess pressure exists inside the package.