What is the working principle of pressure limiting valve of pressure cooker in junior middle school physics? I'd better explain it to Zhang ~ thank you.
The pressure limiting valve has a pressure p=F/s at the air outlet, where s is the area of the air outlet. When the air pressure in the pot is greater than the pressure of the pressure limiting valve, the pressure limiting valve will be jacked up. When jacking up slightly, there is a small hole on the side of the pressure limiting valve to exhaust gas, so as to balance the internal and external pressures. Different pressure limiting valves have different masses and provide different pressures. Therefore, the pressure cooker must be equipped with a pressure limiting valve!