2. The internal and external oxidation and polishing of the pressure cooker are better, and it looks smooth and bright, and there is no pimple and speckle when touched by hand, and there is no sluggish feel. Bakelite handle should be firm, bright and firmly installed, and the upper and lower handles should be aligned so as not to loosen when shaking.

3. The safety valve on the pressure cooker should be absolutely "safe" and carefully selected. The pressure limiting valve is the first insurance for the pressure cooker. The pressure limiting valve consists of the bell-like valve cover in the middle of the pot cover and the exhaust pipe buckled under it. There are exhaust holes on both sides of the valve cover, and there is an exhaust hole on the top of the exhaust pipe. When the air pressure in the pot rises, it will push the valve cover up and down to exhaust gas from the hole, reducing the pressure in the pot.

4. Therefore, the thimble in the valve cover must cover the air holes on the air hole pipe tightly. If the cover is not tight, the air will escape. The air holes must be smooth and smooth, which is easy to catch food and block, and accidents may occur. In the pressure cooker produced now, the exhaust pipe not only has exhaust holes at the top, but also has exhaust holes on both sides. Once the top air holes are blocked, the side air holes can also exhaust, which is another step forward in safety.

5. Pay attention to the soluble valve on the lid. The soluble valve on the pot cover is also called the safety plug, which is the second insurance of the pressure cooker. It contains easily soluble metal sheets. When the pressure in the pot reaches 2500g, it will automatically melt, releasing the gas in the pot, reducing the pressure in the pot and ensuring safety. When selecting, twist the upper and lower nuts of the valve several times to see if it is flexible. If it cannot be twisted, it will be difficult to replace the soluble tablets in the future. The new pressure cooker is equipped with a spring safety plug at the position of the easy-to-dissolve valve. The air pressure in the cooker reaches1800g to 2500g. When the spring is pressed up, the gas in the cooker can escape, which is safer.

6. Some pressure cookers have also improved the design of the sealing ring of the pot cover. If the exhaust pipe and the safety plug are blocked and the air pressure in the pot rises to a certain limit, the steam will push out the sealing rubber ring, which will reduce the pressure in the pot and prevent accidents. Such a pot is safer.