2、 Advantages of fixed pneumatic ball valve:
1. Emergency sealing grease injection rescue: due to the accidental failure of the valve seat seal caused by foreign matters in the medium or fire, the grease injection valve provides a quick connection with the grease injection gun, and the inlet pump injects the sealing grease into the valve seat sealing position conveniently and quickly to alleviate the leakage.
2. Reliable valve stem sealing and low operating torque: in addition to the standard sealing ring, the packing gland is also equipped with an O-ring, which ensures the reliability of the valve stem sealing; The additional graphite packing and sealing grease are injected to minimize the leakage of valve rod after fire. The valve rod sliding bearing and thrust bearing make the valve easy to operate.
3. Full diameter or reduced diameter: full diameter or reduced diameter structure can be selected as required. The flow diameter of the full bore valve is consistent with the inner diameter of the pipeline, which is convenient for pipeline cleaning.
4. Valve stem can be lengthened: according to the needs of installation or operation, the valve stem can be lengthened. The lengthened rod pneumatic ball valve is especially suitable for urban gas and other occasions where pipelines need to be laid underground. The size of the extended valve rod shall be determined according to the customer's needs.
5. Flexible operation: valve seat and valve stem bearing with small friction coefficient and good self-lubricating property are adopted, which greatly reduces the operating torque of the valve. Therefore, even if no sealing grease is provided, the valve can be operated flexibly for a long time.

Two types of pipes commonly used in industrial equipment
In the market, in addition to pneumatic butterfly valves, air ducts are also frequently used. There are many types of air ducts, such as high-temperature air ducts, heat resistant air ducts, glass fiber cloth air ducts, aluminum foil air ducts and other product types. Let's first understand what they have in common:
In terms of application: it can be used for hot gas extraction from high-temperature boilers, automobile exhaust emission, factory solder smoke extraction, blower heater exhaust and welding gas exhaust, exhaust equipment, engine structure, heating engine, solids such as dust, powder and fiber, gas environment such as steam and smoke, dedusting and extraction plant, heater exhaust, aircraft equipment and military micro bellows and compressors, low pressure environment.
Temperature: the temperature range is about - 60 ℃ to+400 ℃, and can be about+450 ℃ in a short time.
Property: the external clamping structure is wear resistant, very tough, and the bending radius is about equal to the outer diameter and the tightening ratio is 1:6.
Structure: wall: special glass fiber, heat insulation fiber, high temperature glue coating; It is wrapped with special glass fiber, and the clamp structure is spiral, stainless steel (VA).