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Technology Hall: The advantages of the new smart valve positioner
Control valve according to the drive mode is divided into two kinds of electric control valve and pneumatic control valve to adapt to different conditions and process requirements, electric control valve, the general by the angular travel electric actuator direct drive valve through 4 ~ 20mA or 0 ~ 10V analog signal control valve opening, so as to achieve the purpose of control. Angle control valve used in the main ball valve, butterfly valve. The electric control valve is simple, without compressed air, but the response speed is slow, poor control accuracy and poor regulation, is limited to use in some of the less demanding control accuracy, lower operating frequency of the workplace. In contrast, pneumatic control valve with high control accuracy, fast response, good job stability, suitable for a wide range of applications, is widely used in various fields of process control. As the brain of the regulating valve, the valve positioner plays a decisive role in controlling the overall control valve and field functions. Compared with the traditional electro-pneumatic valve positioner, intelligent valve positioner has more extensive applications and market prospects in the control valve control accuracy, response speed, function expansion, and improve the level of automatic control of the valve. Therefore, intelligent valve positioner is regarded as the future development of valve positioner. The new smart valve positioner Different smart valve positioner both structural and functional commonality, but also have their own characteristics. In common: as a process controller (PID function comes with), and the valve with pneumatic actuators form an intelligent control valve. It can directly receive the real-time process value signal of the sensor and form a relatively independent complete process control loop together with the sensor to realize the closed-loop control function; it can be provided with analog position feedback output and two binary output signals. Position feedback signal can be the actual position of the valve or the actual process value feedback to the PLC or controller for easy system information collection and monitoring, binary output signal can be extended control valve control and improve the degree of automation of the system; either combined with straight stroke pneumatic Actuator valves such as: corner seat valve, globe valve, diaphragm valve, the use of external linear position sensor form valve positioning control system; also combined with the angular stroke pneumatic actuator valves such as: ball valve, butterfly valve, and diaphragm pneumatic Control valves, etc., using the built-in angular position sensor valve positioning control system; as a standard valve positioner (electric - gas converter function), can be widely used in a variety of pneumatic actuators with process control valve position control;