Control valve by driving mode is mainly divided into electric regulating valve and pneumatic control valve, to adapt to different working environment and process requirement, electric control valve, generally by quarter-turn actuators, direct drive valve by 4 ~ 20 ma, or 0 ~ 10 v analog signal to control the Industrial Valves opening, so as to achieve the goal of control. Applied to the control valves are mainly quarter-turn ball valve, butterfly valve, etc. 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 valve with high control precision, fast response speed, good stability, wide variety of application and other characteristics, widely used in process control field from all walks of life. As a regulator of the brain, valve positioner control performance of the control valve and the field function plays a decisive role. With the traditional electric - Compared to gas conversion type valve positioner, intelligent Industrial Valves positioner in control valve control accuracy, response speed and function extension, improve the level of automatic control valve has a broader application and market prospect. So, the intelligent valve positioner is regarded as the future development direction of the valve positioner. A new type of intelligent valve positioner is different on the intelligent Industrial Valves positioner is both the structure and function of the common, but also have their characteristics. In common: a process controller, Built-in PID function) With the intelligent regulator valve with pneumatic actuator. 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; You can output analog position feedback and two binary output signal. The actual position of the valve position feedback signals or actual process value or feedback to the PLC controller, facilitate information acquisition and monitoring system, the binary output signal can be expanded regulator control function and improve the degree of automation of the system; Can be combined with straight trip valve pneumatic actuators such as Angle seat valve, cut-off valve, diaphragm valve, etc. , in the form of external line position sensor of the valve position control system; And can be combined with the Angle of the trip valve pneumatic actuators, such as: ball valve, butterfly valve, and diaphragm type pneumatic control valve, etc. , sensor of the built-in quarter-turn valves positioning control system; As a standard valves locator ( Electric - Gas converter function) , can be widely used in all kinds of valve with pneumatic actuator process control of position control;
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