The selection of the ball valve sealing surface involves a number of factors, including media type, working conditions, operating temperature, surrounding environment and performance requirements of the sealing surface. The following is a detailed analysis of the selection of the sealing surface of the ball valve: 

 1. Type of media 

 Different media have different requirements for the material of the sealing surface. For example, for acid and alkaline media, the fluorine-lined series can be more corrosion-resistant, such as polytetrafluoroethylene; for media with serious particulate matter scouring, carbide, ceramic seals can have strong scouring resistance; for walking gas media, fluorine-lined series can be sealed, and the highest temperature of the fluorine series can be 120. If the high-temperature gas is higher, PFA and PPL series can be selected. 

2. Working conditions 

 The working conditions of ball valves, such as pressure and flow, will also affect the selection of sealing surfaces. For example, in the case of high pressure and high flow, it is necessary to choose materials with high structural strength, wear resistance and good corrosion resistance. In the case of high sealing force, seals coated with PTFE can be selected to reduce air leakage. 

3. Operating temperature 

 Operating temperature is also an important factor to be considered when choosing sealing surface materials. For example, in low-temperature environments, elastic materials such as silicone, EPDM, etc. can be selected. In high-temperature environments, it is necessary to choose materials with a wider range of temperature, such as PFA, PPL, etc. 

4. Performance requirements of sealing surface 

 In addition to the above factors, it is also necessary to consider the performance requirements of the sealing surface, such as corrosion resistance, scouring resistance, abrasion resistance, etc. These performance requirements are usually related to the nature of the medium, working conditions and the service life of the sealing surface. 

 Corrosion resistance: Choosing materials with good corrosion resistance can extend the service life of the sealing surface. 

 Brush resistance: For high-speed flowing media, it is necessary to choose materials with good erosion resistance to prevent the sealing surface from being washed and destroyed. 

 Abrasion resistance: During the opening and closing of the ball valve, the sealing surface will rub against each other, so it is necessary to choose materials with good abrasion resistance to reduce wear. 

 5. Common sealing surface materials and their characteristics 

 Rubber: It has good elasticity and sealing properties, but has limited temperature and pressure resistance. 

 Plastics: such as nylon, PTFE, etc., have the characteristics of good corrosion resistance and low friction coefficient. 

 Stainless steel: It has good corrosion resistance and heat resistance, and is suitable for ball valve sealing surfaces in special environments such as high pressure and high temperature. 

 Carbide: Excellent comprehensive performance such as corrosion resistance, erosion resistance and abrasion resistance, long service life. 

 When selecting the sealing surface of the ball valve, it is recommended to consider the above factors comprehensively and make reasonable choices according to the specific use environment and requirements. Professional engineers or experts in related fields can be consulted for more professional advice and guidance. At the same time, attention should also be paid to selecting products produced by regular manufacturers to ensure product quality and performance.