The control valve drive consists of pneumatic control valve two into the electric control valves and, to adapt to different environmental conditions and process, the electric control valve, generally by a rotary electric actuator direct drive valve, through the analog signal control valve opening of 4 ~ 20mA and 0 ~ 10V, so as to control the objective. Rotary control valves used in the main ball valve, butterfly valve. And the electric control valve operation is simple, without compressed air, but the slow response, poor performance of control precision and regulation, only in some application is not high, the control accuracy of lower frequency of workplace action. In comparison, the pneumatic control valve with high control precision, fast response speed, good stability, wide range of application, process control has been widely used in all walks of life.
The brain as a control valve, the valve positioner to control the entire control valve performance and field function plays a decisive role. Compared with the traditional electric - gas conversion-typeForged valve positioner, intelligent valve positioner in control valve control accuracy, response speed, extended function, improve the level of automatic control valve has a broader application and market prospects. Therefore, the intelligent valve positioner is seen as the future development direction of valve positioner.
Intelligent valve positioner different both structural and functional similarities, but also have their own characteristics.
In common:
As the valve positioner standard (electro-pneumatic converter function), and can be widely applied to various with pneumatic position control mechanism of the process control valve;
As the process controller (PID function), and actuator valves intelligent valve with gas. The real-time process can directly receive the sensor signals, and sensor together constitute a relatively independent of the integrity of the process control loop, closed-loop control function;
Combining the direct-stroke pneumatic actuator valves such as: angle seat valve, globe valve, diaphragm valve, using the form of an external wire position sensors valve positioner control system; can also be combined with the rotary actuator valve ball valve, butterfly valve, such as: and diaphragm type pneumatic control valve, valve positioning control system using built-in angle journey sensor;
Can be used in both single actuator valve, normally open and normally closed valve, but also can be used for double-acting actuator control valve or cylinder;
With analog position feedback output and two binary output signal. Position feedback signal of the valve can be the actual position value or actual process of feedback to PLC or controller, which is convenient for the system of information collection and monitoring, a binary output signal can be extended control function of regulating valve and improve the degree of automation system;
A good man-machine interface, easy to operate; large screen digital LCD display, real-time display of set and actual values and can show the valve temperature; the three-button menu instructions, easy debugging and maintenance.
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