1 Project overview background and research and development significance
1.1 The overview of the research and development project of metal seat pneumatic ball valve is based on the continuous improvement of the single unit capacity and parameter level of domestic thermal power generation units, which puts forward higher requirements for the performance of power generation equipment such as wear resistance, corrosion resistance, high temperature resistance, oxidation resistance, etc. The problems of wear and high temperature corrosion in power plant equipment have brought potential safety hazards and accidents to power plant equipment, increased maintenance costs and reduced utilization ratio of power generation equipment. As a new technology of material surface strengthening, protection and size recovery, thermal spraying technology can improve the utilization rate of power generation equipment, reduce the maintenance cost of equipment, and is of great significance to reduce the cost of power generation. It is widely used in equipment maintenance and machinery manufacturing. Under the high temperature and high pressure industrial conditions, the internal leakage of the valves in the high temperature and high pressure drainage system will cause huge energy waste and increase system wear. Traditional stop valves and gate valves can not meet the requirements of high-temperature and high-pressure working conditions. The development of high-temperature and high-pressure metal seat pneumatic ball valve (DN40~DN60) has technical advantages, which can solve the problems of high-quality medium leakage and equipment wear in the thermal system.
1.2 The research and development project of high temperature and high pressure metal seat pneumatic ball valve (DN4O~DN60) of research and development significance focuses on the extension of supersonic thermal spraying technology, because this technology has broad application prospects in terms of anti-corrosion of the last stage blades of power plant steam turbines, and greatly improving the wear resistance of key parts of steam turbines, boilers and other equipment. The application of high temperature and high pressure metal seat pneumatic ball valve can solve the problem of equipping high performance valves for boiler, steam turbine proper and pipeline drainage water existing in most power plants in China at present, which will effectively reduce the internal leakage of high-grade working medium, effectively optimize the thermal system, and improve the thermal efficiency of the unit. The promotion and application of high-temperature and high-pressure metal seat pneumatic ball valves (DN40~DN60) in the power industry can replace a large number of imported similar products, improve the technical level of high-temperature and high-pressure valves in China, and effectively reduce the equipment procurement costs of enterprises. Therefore, this research project has practical significance.

What are the common scales for pneumatic butterfly valves
What are the common names of pneumatic butterfly valves? This is to understand the customer's application habits and the application scope of the product Metal soft connection: since the product has the function of connecting the pipeline to reduce vibration and noise, white steel hose: white steel is a general term for stainless steel, and the combination of corrugated pipe and mesh sleeve also belongs to the hose Stainless steel hose: much the same as white steel hose
Corrugated pneumatic butterfly valve: inside the mesh sleeve is the corrugated pipe, which is also called tube blank 304 white steel hose in our jargon: a brand most commonly used in stainless steel data, which is highly resistant to high temperature acid and alkali corrosion, and is very suitable. In addition to the above, there are also some quick coupling methods, such as connection methods based on performance, application environment, etc., which are lined with tetrafluoroethylene, large diameter, threaded connection, and flange, Forming Record of Metal Bellows of Pneumatic Butterfly Valves for Distillery (I)
The hydraulic processing of corrugated pneumatic butterfly valve is a process method for forming annular bellows with rectangular, circular, elliptical, runway shaped sections.
After adjusting the position of the die and the tube blank, pressurize the inner cavity of the tube blank, and then stop the mechanical tightening along its axial direction, and a corrugated pipe will be formed soon. This is a method of hydraulic forming, called multi wave one-time forming method. This processing method is often used for bellows commonly used as elastic elements. But for the bellows of the pneumatic butterfly valve itself, this method will not work. Since there are many requests for bellows in pneumatic butterfly valves, such as length, etc., people have invented another method of hydraulic forming, "single wave continuous forming method". It can continuously form tens, hundreds, even thousands, tens of thousands of corrugations when the tube blank length allows. When used, it can be cut according to the required length or the required number of corrugations. In this sense, it can replace multi wave one-time forming machine tools. Only by changing molds of different specifications, you can consume multi-functional equipment of different specifications, which is the key equipment of the consumption line. It also greatly saves manufacturing time and materials.