High temperature pneumatic ball valve: Q41M, Q641M, Q941M, Q41PPL, Q641PPL, Q941PPL

5、 Applicable scope of pneumatic ball valve Pneumatic ball valve is applicable to nominal diameter from 8mm to 1200mm; Nominal pressure from vacuum to 42MPa; The working temperature ranges from - 204 ℃ to 815 ℃; Generally, pneumatic ball valves are recommended for pipeline systems with dual position adjustment, strict sealing performance, mud, wear, necking channel, rapid opening and closing (1/4 turn opening and closing), high pressure cut-off (large pressure difference), low noise, cavitation and gasification, a small amount of leakage to the atmosphere, small operating torque and small fluid resistance. Pneumatic ball valve is also suitable for pipeline systems with light structure, low pressure cut-off (small pressure difference) and corrosive media. Pneumatic ball valves can also be used in low-temperature (cryogenic) devices and pipeline systems. When the adjustment performance is required, the pneumatic ball valve with special structure and V-shaped opening shall be selected. In petroleum, petrochemical, chemical, electric power and urban construction, metal to metal sealed pneumatic ball valves can be selected for pipeline systems with operating temperature above 200 ℃. In the oxygen pipeline system of metallurgical industry, the pneumatic ball valve with strict degreasing treatment shall be used. When the main pipeline in the oil and gas pipelines needs to be buried underground, the full bore welded pneumatic ball valve shall be used. Pneumatic ball valves are widely used in irrigation systems, mainly at the inlet of branch pipes. The pneumatic ball valve is simple in structure, small in volume and small in resistance to water flow. The disadvantage is that it can be opened or closed too quickly, which will cause water hammer in the pipeline (the pressure will rise when the water flow speed in the pipeline changes suddenly). Therefore, the pneumatic ball valve should not be used on the main pipe, but can be used for flushing on the main pipe, branch pipe or its end, with good flushing and blowdown effect. Since the seat sealing ring of the pneumatic ball valve is usually made of plastic, the fire resistance and fire prevention of the pneumatic ball valve should be considered when selecting the structure and performance of the pneumatic ball valve. Especially in the petroleum, chemical, metallurgical and other departments, when using the pneumatic ball valve in equipment and pipe systems with flammable and explosive media, more attention should be paid to fire resistance and fire prevention. Generally, pneumatic ball valves are recommended for pipeline systems with dual position adjustment, strict sealing performance, mud, wear, necking channel, rapid opening and closing (1/4 turn opening and closing), high pressure cut-off (large pressure difference), low noise, cavitation and gasification, small leakage to the atmosphere, small operating torque and small fluid resistance.