1. Safety mechanism of stainless steel pressure cooker
Early pressure cookers were equipped with only one main safety valve. If they are not properly maintained, there is a risk of explosion and food residues will contaminate the release valve. Modern stainless steel pressure cookers usually have two or three redundant safety valves, as well as some additional safety features.
For example, an interlocking lid can prevent the user from opening the lid when the internal pressure exceeds atmospheric pressure. If any safety mechanism is not in place correctly, the pressure cooker will not be able to reach pressure. The stainless steel pressure cookers for sale can only be operated after reading the instruction manual, because each model is slightly different in the implementation of the safety mechanism, and should be maintained regularly according to the pressure cooker manufacturer's instructions.
2. Safety features of stainless steel pressure cooker
For the first-generation pressure cooker with a weighted valve or "fine regulator", the main safety valve or regulator usually takes the form of a weighted plug, usually called a "rocker" or "exhaust pipe." This weighted plug is lifted by steam pressure, allowing excess pressure to be released. If the main pressure release mechanism fails, there is a backup pressure release mechanism that can use any of a variety of different techniques to quickly release pressure.
One method is to open a hole in the lid and plug it with a low-melting-point alloy plug; the other is a rubber gasket with a metal insert in the middle. Under sufficiently high pressure, the gasket will deform and the insert will blow out of its mounting hole, thereby releasing the pressure. For pressure cookers with silicone gaskets, a common safety feature is the design of the gasket, which expands and releases the downward pressure between the lid and the pot.