The present invention creates a new rigid degassing valve. The valve of the present invention utilizes a relatively stiff support body in order to successfully vent gases, such as carbon dioxide, from within the packaging. Carbon dioxide may be created by organic products placed in the packaging which causes the package to expand. The valve of the current invention maintains its shape as the package becomes bloated and takes on a rounded shape due to carbon dioxide expended by the roasted coffee beans.The invention pertains to a pressure relief valve for use on packaging containers comprising a stiff support body mountable to a package surface defining an inner aperture wherein the stiff support body has a stiffness of between 300 grams and 800 grams; a flexible film having a top and bottom surface mounted to said stiff base and moveable between an open and closed position; a rail mounted on said stiff base permitting the flexible film to move between an open and closed position; in said open position said film is located above said aperture; in said closed position, said film covers said aperture; and wherein the stiff support body does not conform with any curvature of the packaging surface such that the flexible film may move between an open and closed position regardless of the curvature of the packaging surface.