What problems should be paid attention to when selecting the pneumatic control valve?

Pneumatic control valve and electric control valve are not much different, but the actuator is different. The former requires a compressed air source, and the latter only requires a power source, which is more convenient. Pneumatic control valves need to be equipped with compressors and other equipment, which have the advantages of explosion-proof function, simple maintenance and low failure rate. Therefore, in the chemical, petrochemical and other industries, its application range is far greater than that of electric control valves.

According to different structural forms, pneumatic control valves can be divided into pneumatic single-seat control valves, pneumatic sleeve control valves, pneumatic double-seat control valves, pneumatic three-way control valves, pneumatic cage control valves, pneumatic angle control valves, and pneumatic V Type regulating ball valve, pneumatic butterfly valve and other categories. The prepared actuators mainly include membrane type and piston type, among which the control accuracy of membrane type actuator is slightly higher than that of piston type actuator. According to the different power distribution valve positioners, it can be divided into two types: mechanical and intelligent. The control accuracy of intelligent is higher than that of mechanical.

According to the different medium, the valve body material also has different choices. Commonly used carbon steel, corrosive stainless steel, 304 or 316, 316L and other materials can also choose fluorine-lined regulating valve. There are also several special pneumatic control valves: low temperature control valve, high temperature control valve, high pressure control valve, small flow control valve and so on. A single regulating valve is used for working conditions where the pressure difference is relatively small. Once the pressure difference is relatively large, you can choose a sleeve control valve or a double-seat control valve. Because the leakage of the double-seat control valve is relatively large and the leakage is small, it is not suitable to choose the double-seat control valve.

All in all, users should choose the pneumatic control valve correctly according to their actual needs to achieve a good use effect.
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