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A pressure cooker is NOT anything close to a slow cooker. The cooking philosophy are practically totally opposites. A pressure cooker basically cooks your food in a fraction of time because it is under pressure. A slow cooker takes hours.
The whole idea of using a pressure cooker is that it is sealed and applies pressure to cook the food faster. The lid needs to be sealed for the pressure cooker to operate properly. It is frequently referred to as "infusion" cooking now days.
You need to read the instruction book that came with the pressure cooker. Pressure cookers usually cook for less than an hour--my homemade pressure cooker spaghetti sauce is cooked in less than 30 minutes. They are nice and were very popular long before anyone thought of microwaves and slow cookers. However, there are some precautions to be taken. There must be water or liquid in a pressure cooker. The rubber seal needs to be cleaned frequently and, when the rubber seal warps/stretches and no longer seals, it needs to be replaced. There are also certain foods that CANNOT be cooked in a pressure cooker like rice, dry beans, etc. The pressure control valve operates to regulate the amount of pressure and releases extra pressure otherwise the unit would blow up (very dangerous!). Most pressure cookers (required on all new ones) have a small rubber emergency stopper that will "blow off" in case the pressure is too high. I've seen this happen and my mother cleaning potatoes & meat from the ceiling!
Russel Hobbs makes both a slow cooker and a pressure cooker - confusingly in Europe they call Slow Cookers pressure cookers. The only way to really tel is if there is a special lid with valves and locks (pressure cooker) not a glass or plain lid (slow cooker).
Take the rubber ring out of the lid. Wash it with warm soapy water. Dry it. Oil it with vegetable oil. Now do you see how the rubber ring has a groove around it on the inside? Push your thumb into the groove and work it around the ring, you're trying to spread the rubber V out.
Put it back in the lid and take it for a test run.
In the future store your cooker with the lid upside down on top, keeping it closed will ruin the seal.
If it still won't seal replace the rubber parts, you can get a kit for your cooker from presto.
Go to the Corning Ware website to see if they have one. If not, check on Ebay, since someone almost always has manuals available for sale on there. If you do not see one, then simply put in a request on ebay, and i am sure someone will offer up one.