steam valve protects packaged foods against contaminants and more accurately regulates the inhome cooking process for both microwave and oven applications.the steam valve system uses a proprietary design that provides a hermetic seal when applied over a precut hole in flexible packaging or lidding film. during the cooking process, the valve opens at a predetermined temperature and allows steam to escape by exposing the structure&rsquos slitted or perforated baffle layer.the use of an external valve allows a steam release feature to be added without changing the package&rsquos basic construction. steam valves are completely clear and can be printed with text, graphics and logos in one color. 
