The main purpose of the pneumatic valve positioner

Pneumatic valve procurement only clear specification, category, work pressure meet the requirements of the practice, can be used to control air, water, steam, all kinds of corrosive medium, mud, oil, liquid metal and radioactive medium such as various types of fluid flow. Double acting type switch valve pneumatic control valve positioner, such as petroleum, chemical, electric power, metallurgy industry automation control, improve production efficiency and reduce the production cost is one of the key components. Pneumatic valve positioner according to the structure of the pneumatic valve positioner, electric valve positioner and intelligent valve positioner, is the main control valve accessories, usually with pneumatic control valve, it accepts the regulator output signal, and then to its output signal to control the pneumatic control valve, when the control valve, the valve stem of the displacement feedback through mechanical device to valve positioner, valve position condition through the electrical signal to the upper system. Pneumatic valve positioner can increase the output power of the regulating valve, reduce the control signal transmission lag, to speed up the movement of the valve stem, can improve the linearity of the valve, to overcome the friction of the stem and eliminate the influence of unbalanced force, so as to ensure the correct positioning of the regulator.