3、 Generally, the soft seal ball valve uses PTFE as the sealing material, and the sealing surface of the hard seal ball valve is made of metal surfacing. If it is necessary to clean the pipe ball valve, be careful not to damage the sealing ring and leak during disassembly.

Machining process of pneumatic butterfly valve
1. Welding quality
Corrugated pipe, reinforcing ring and wire mesh sleeve are easy to show the phenomenon of faulty welding of steel wire (burned or not welded) during the welding process. When the hose is installed in the pipeline, due to uneven stress on the steel wire, under the effect of medium pressure, the faulty welding steel wire will pull off, which may lead to the destruction of corrugated pipe bulge
The effective area of the corrugated pipe wall thickness is reduced due to the lack of crystal depressions such as faulty welding, porosity, and branch looseness in the longitudinal weld of the corrugated pipe in the pneumatic butterfly valve. The insufficient strength leads to cracking and destruction of the weld. The welding of carbon steel data and stainless steel parts constitutes an adverse environment for typical small area of anodic parts and large area of cathodic parts, which is prone to rapid corrosion failure of data. Therefore, the discussion of welding process and selection of welding materials should be strengthened, and the welding quality inspection should be strengthened to improve the reliability of products.
2. Machining
Data During the rolling wave processing, due to uneven stress, regular microcracks are easily generated on the inner and outer surfaces of the wave crest. During the welding and forming process, microcracks start to crack on the inner and outer surfaces of the hose. In the subsequent assembly experiments and applications, the microcracks grow wearily and eventually fail. The improvement of data processing technology and welding technology can prevent the generation of microcracks.
3. Heat treatment
The main functions of heat treatment are: improving the cutting performance and machining accuracy of metal materials; Improving fracture toughness of metal materials; Reduce the cracking of metal materials. If the heat treatment is incomplete, the output and quality will be affected. For example, the solution heat treatment temperature of austenitic stainless steel is about 1080 ℃. If the solution treatment is incomplete, the carbide cannot be fully solution, and the data itself has carbide precipitation, the corrosion resistance and
In order to reduce the defects caused by heat treatment, it is necessary to eliminate the conditions for crack generation, improve the external compressive stress, improve the quality of metal materials and properly add alloying elements.