6. Application of pneumatic ball valve Since rubber, nylon and polytetrafluoroethylene are commonly used as valve seat sealing ring materials for pneumatic ball valves, its service temperature is limited by the valve seat sealing ring materials. The cut-off function of pneumatic ball valve is completed by the metal ball pressing against the plastic valve seat under the action of medium (floating ball pneumatic ball valve). Under the action of a certain contact pressure, the seat seal ring has elastic-plastic deformation in some areas. This deformation can compensate the manufacturing precision and surface roughness of the ball and ensure the sealing performance of the pneumatic ball valve. 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 the equipment and pipeline system 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. 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. 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. 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 ℃.

Why should flexible waterproof casing be used in pool sludge
In daily life, flexible waterproof sleeves are widely used. People have more and more knowledge about this product. So, how can we buy more flexible waterproof sleeves that are more suitable for us and more affordable? First of all, we need to see the settling time of flexible waterproof lining. What do we think? During coagulation sedimentation, the sedimentation time of inclined tube sedimentation tank depends on the quality of raw water, etc
At this time, it is necessary to create your own operating experience under similar conditions. When the raw water is dominated by chromaticity or organic matter, or low-temperature water precipitation, the precipitation time should be appropriately increased and appropriately reduced. On the other hand, the settlement time of the flexible waterproof shell should be appropriately increased
Then we can see the surface load rate of the flexible waterproof lining, which is the only indicator that affirms the sedimentation efficiency of the ideal sedimentation tank. According to the turbidity of raw water, the surface load rate is adopted. The third is the flexible waterproof sleeve. The increase of the horizontal speed of the horizontal speed not only uses the volume of the sedimentation tank to reduce the impact of short flow, but also strengthens the flocculation disturbance, But the increase of horizontal velocity also improves the effect of particle flow in turbulent flow. It will cause the erosion of sediment at the bottom of the pool
The Reynolds number Re and the flud number Fr of the flexible waterproof sleeve are indicators reflecting the flow state. Finally, the tank layout of the flexible waterproof sleeve can be divided into two groups of sedimentation tanks. These are the best methods to select the steel flexible waterproof sleeve