The welded joints of all welded valve bodies are generally designed for narrow gap thick wall submerged arc welding, such as Class600, 20 inch pneumatic ball valve, and 44mm, C1ass900, 48 inch pneumatic ball valve with 140mm welding wall thickness. It is a tubular welded joint with extra thickness. Thick wall multi-layer welding process is a process of repeated heating and cooling of metal materials, which leads to nonuniformity and deterioration of the welded joint structure, high residual stress, and even welding defects. Welding is the last process after the assembly of the product. There are non-metallic sealing materials rubber and polytetrafluoroethylene plastic in the valve chamber, so post welding heat treatment is not allowed.

Problems in Application of Stainless Steel Pneumatic Butterfly Valves
The stainless steel pneumatic butterfly valve has a certain tension resistance between the side buckles of each section to prevent the damage of the hose from causing the exposed space of the line laid inside the hose.
1. The fluid temperature is too high or the fluid has corrosive components, which can unite the stainless steel pneumatic butterfly valve.
2. The stainless steel pneumatic butterfly valve will be hydrolyzed or aged if it is stored in a wet place or the storage period is too long, which can lead to fracture.
3. The stainless steel pneumatic butterfly valve can be united when the thermal insulation contraction leads to abnormal temperature rise; When PU tube is used for vibrating and bending moving end, it can cause temperature rise and lead to hose solidarity due to automatic heating of molecular heat attack.
The small diameter stainless steel pneumatic butterfly valve provides a disposal plan for the maintenance of fine electronic equipment and sensor lines, fine optical ruler sensor lines, and industrial sensor lines. Stainless steel pneumatic butterfly valve has excellent flexibility, corrosion resistance, high temperature resistance, abrasion resistance and tensile strength.