According to pressure, it can be divided into high-pressure ball valve and low-pressure ball valve
High pressure pneumatic ball valve: mainly used in oil, natural gas, hydraulic oil, construction machinery and other industries
Low pressure pneumatic ball valve: mainly used in corrosive pipelines with water as the medium!

Maintenance and maintenance measures of pneumatic butterfly valve
It is widely used in daily life, but daily maintenance is very important, which determines the service life of the product. In order to ensure better application of this product, let's now understand: when selecting the model of pneumatic butterfly valve, pay attention to that two pneumatic butterfly valves with smaller diameter and the same length are generally selected for the heat tracing pipe, which are respectively located at the lower left side and the lower right side, And bind them together with glass cloth. In order to avoid wetting, the surface can be coated with ground water layer, or a waterproof iron shell cover can be specially made, but it shall not affect its compensation displacement.
During operation, strict procedures must be followed. There are many cases of pneumatic butterfly valve corrugation compensator damage caused by starting the pump before the valve in front of the tank is opened. This must arouse attention.
Safety inspection shall be stopped every year for pneumatic butterfly valves and corrugated metal compensators in use. Remove them from the system pipeline. After cleaning, conduct a hydraulic test at 1.5 times of the working pressure for 10 minutes. After drying or drying, conduct a pneumatic test at 1 time of the working pressure for 15 minutes. Leakage is not allowed. At the same time, its appearance shall not show some abnormal phenomena such as the fracture of steel strip of mesh sleeve or the scattering of nuts.
When the hose or corrugated compensator works to the lower limit position, it is not clear that its compensation can be used up. If it is necessary to replace the large compensation, the compensation can also be stopped by reducing the height of the connecting pipe mouth. Although all hoses or corrugated compensators have not yet worked to the lower limit position, they have been used for many years and must be replaced.
Generally speaking, pneumatic butterfly valves or corrugated compensators connected to crude oil tanks and heavy oil tanks generally work for 8-10 years in inland areas and 5-8 years in coastal areas; pneumatic butterfly valves or corrugated compensators connected to storage tanks of light oil and other flammable and explosive media generally work for 5-8 years in inland areas and 3-5 years in coastal areas.