2、 Working principle of pneumatic ball valve: the pneumatic ball valve can be closed tightly only by using the pneumatic actuator to rotate 90 degrees with the air source and a small rotating torque. The completely equal inner cavity of the valve body provides a straight flow passage with little resistance for the medium. It is generally believed that ball valves are most suitable for direct opening and closing. The main features of the ball valve are its compact structure, easy operation and maintenance, and suitable for general working media such as water, solvent, acid and natural gas, as well as media with poor working conditions such as oxygen, hydrogen peroxide, methane and ethylene. The valve body of the ball valve can be integral or combined.

What are the corrosion forms of stainless steel pipe fittings
Although stainless steel pipe fittings have good performance and long service life, they will inevitably be corroded. In some media, stainless steel pipe fittings can resist corrosion, but in some media, they will be corroded due to chemical stability defects. Generally, there are five types of corrosion of stainless steel pipe parts, namely, uniform corrosion, pitting corrosion, intergranular corrosion, stress corrosion and crevice corrosion. The following is mainly to analyze the form of uniform erosion of the surface layer: average erosion of the surface layer. This form refers to the overall erosion of the metal surface layer that touches the media of erosion of the surface layer. According to different application conditions, different standard requirements for corruption and erosion can generally be divided into two types:
First, stainless steel corrosion refers to the steel corroded by corrosion in air and media with low corrosion performance. The corrosion rate is smaller than 0.01 mm per year, which is regarded as "completely corrosion resistant"; The corrosion rate is smaller than 0.1mm per year, which is regarded as "corrosion resistance".
The second type, corrosion resistant steel, refers to stainless steel pipe fittings corroded in various mediums with strong corrosive ability.
The resistance to atmospheric corrosion of 304 stainless steel pipe fittings is determined by the internal chromium element. However, because chromium element is one of the components of steel, the maintenance methods are different. If the chromium content in the steel reaches 5%, the resistance to atmospheric corrosion of the steel will be significantly enhanced, but when the chromium content exceeds 5%, although the corrosion performance can be enhanced, it will not be very significant. The reason is that when chromium is used to prohibit the alloying treatment of steel, the type of surface oxide is changed into the surface oxide composition similar to that of pure chromium metal. This closely attached chromium rich oxide protects the surface of the steel from being oxidized again.