Cooking has never been easier and more fun with the VON Pressure Cooker. Enjoy a wide variety of meals with the 15 in 1 multi-function where you can cook beef, poultry, vegetables, porridge, steam, saute, beans, mixed grains, soup, broth, curry among others. Von pressure cookers have a locking device on top of the lid. These locking devices only open once the pressure inside the cooker is reduced to an optimum level where it is safe to take the lid off the cooker. The lock responds to the pressure developed inside the cooker. Pressure release valves are pressure regulators that maintain the pressure inside the cooker to a controlled value. When there is sufficient pressure built up inside the cooker, these valves reduce the pressure inside by opening up. Interlock lid prevents the user from opening the lid when the internal pressure exceeds atmospheric pressure, preventing accidents from a sudden release of hot liquid, steam, and food.