Pneumatic control valve with the progress of science and technology and the improvement of living standards are widely used in life, generally is chemical industry, electric power, food, metallurgy and so on industry used in the majority, it is the modern industrial enterprise one of the widely used industrial process control instrument,
Pneumatic - valve usually are connected by a pneumatic actuator and control valve installation and debugging after the formation of the combination instrument, it can be seen that the pneumatic control valve is not a strange and distant vocabulary, it is closely related to our life, with the existence of the pneumatic control valve, we all aspects of life to go smoothly, as well as pneumatic regulator's role is so important, for its quality requirements also must strive for perfection,

The selection of pneumatic - valve structure forms:
The steam flow control should choose single seat;
Large diameter, large flow, low pressure difference occasions should choose butterfly valve, but at the moment, leakage is larger;
When the medium to high pressure, should choose high pressure regulating valve;
For convenience of drainage, prevent the valve plug, optional Angle regulator;
Heat exchanger of the water or water temperature regulation optional the 3-way regulating valve,

Regulating valve caliber choice:
Using two position regulator, can choose valve diameter pipe diameter according to receive directly;
Other situations should be according to the maximum flow of medium and valve pressure drop calculation of flow capacity Kv value to determine the valve diameter,