A new type of intelligent pneumatic valve positioner in regulating the application of pneumatic valve

control pneumatic valve by driving mode is mainly divided into electric pneumatic regulating pneumatic valve, pneumatic valve and to adapt to different working environment and process requirement, electric regulating pneumatic valve, generally by the angular travel electric actuator driven by pneumatic valve directly, through ~ mA or ~ V analog signal control pneumatic valve opening, so as to achieve the goal of control. Applied to the Angle of stroke control pneumatic valves are mainly pneumatic ball valves, pneumatic butterfly valve, etc. Pneumatic and electric control valve operation is simple, without compressed air, but slow response speed, control precision and poor regulation performance, is limited to application in some of the control accuracy is not high and low frequency of the workplace. In comparison, the pneumatic control pneumatic valve with high control precision, fast response speed, good stability, wide variety of characteristics of the process control is widely used in all walks of life. As adjust the brain of pneumatic valve, pneumatic valve positioner of the control of the pneumatic valve control performance and function plays a decisive role. With the traditional electric - compared to gas conversion type pneumatic valve positioner, pneumatic valve positioner in intelligent control of the pneumatic valve control accuracy, response speed and function extension, improve the level of automation control pneumatic valve has a broader application and market prospect. So, intelligent pneumatic valve positioner is regarded as the future development direction of pneumatic valve positioner. New type of intelligent pneumatic valve positioner different intelligent pneumatic valve positioner in common on both the structure and function, but also have their characteristics. In common: s as standard pneumatic valve positioner ( Electric - Gas converter function) , can be widely used in all kinds of pneumatic actuator position control of the process control of pneumatic valves; S as a process controller, Built-in PID function) , with pneumatic actuators and pneumatic valve, pneumatic valve is composed of intelligent. Values can be directly receive sensor real-time process the signal, and sensor to form a relatively independent, complete process control circuit to realize closed loop control function; S can be combined with straight travel actuator pneumatic valves such as: pneumatic valve, globe pneumatic Angle seat valve, pneumatic diaphragm valve, etc. , in the form of external line position sensor of pneumatic valve positioning control system; And combining with the Angle of stroke actuator pneumatic valves such as ball pneumatic valve, butterfly valve, and diaphragm type pneumatic regulating pneumatic valve, etc. , using built-in angular distance sensor of pneumatic valve positioning control system; S can be used for both the single-acting actuator pneumatic valve, open type or closed type pneumatic valves as usual, and can be used for double-acting pneumatic valve actuator or control of cylinder; S can take two binary output analog output and position feedback signal. The actual location of the position feedback signal to pneumatic valve or actual process value or feedback to the PLC controller, facilitate information acquisition and monitoring system, the binary output signal can be extended to adjust the control function of the pneumatic valve and improve the degree of automation of the system; S good human-machine interface, easy to operate; Large digital LCD screen, real-time display set value and actual value and can display the pneumatic valve temperature; Three key menu instructions for the commissioning and maintenance.