3 Analysis of main sealing structure of pneumatic ball valve Early pneumatic ball valves generally use metal materials as the sealing structure (also known as hard sealing). With the development of engineering plastics technology, especially the emergence of polytetrafluoroethylene, the sealing structure of pneumatic ball valves has a more ideal sealing material. The common soft seal forms of the main seal structure of pneumatic ball valve include rigid seal seat, seal seat with elastic elements, PTFE lip seal seat and combined seal seat composed of elastic expansion ring and PTFE lip seal seat. The lip type seal seat has a lip shaped structure, which makes it more elastic. In use, it can ensure the pre compression of the sealing surface and compensate the pre compression of the sealing surface, which is superior to the rigid structure.

Introduction to flange connection pneumatic butterfly valve method
Introduction to flange pneumatic butterfly valve method
One end is a flat welding flange, the other end is a looper flange, the flange material is carbon steel, the nominal diameter is 200mm, the nominal pressure is 1.0MPa, and the length is 3000mm.
Product code: 10JRL200A-3000 (note: if stainless steel flange is required, please mark B) Tools/raw materials
Pneumatic butterfly valve with flange connection
Pneumatic butterfly valve
Steps/Methods
1. The corrugated pipe of stainless steel hose is made of chrome nickel austenitic stainless steel, and attention shall be paid to avoid pitting corrosion of nitrogen ions and corrosive damage of dilute sulfuric acid and dilute sulfuric acid during operation.
2. After the user stops the hydraulic test on the equipment and pipeline system equipped with stainless steel hoses, the impact of rust blocks and the accumulation of sediment containing chloride ions shall be avoided to form corrosion and mechanical damage.
3. When installing the pneumatic butterfly valve, it is necessary to avoid splash scalding and mechanical damage during welding, otherwise leakage will occur.
4. The airtight pipe system shall strictly abide by the safe operation procedures to avoid hose pulling off or bursting due to overpressure caused by improper operation or other factors.
5. Please carefully digest the examples of stainless steel hose devices and strictly follow the correct schematic device.
The annular bellows is a tubular shell with closed circular corrugations. The waves are connected in series with circular corrugations.
The annular corrugated pipe is formed by seamless pipe or welding.
Due to the limitation of processing method, the length of single tube is usually shorter than that of spiral bellows.
The advantages of annular bellows are good elasticity and small rigidity.