The valve locator for the pneumatic control valve flow control

The valve locator for the pneumatic control valve flow control, play an important role in the field of industrial control. Valve positioner through automatic calibration, initialization, such as operation, the parameters self-tuning, such as automatic identification of the actuator direction, zero and range, application on different types of pneumatic control valve, to overcome the pneumatic control valve stem packing friction, the influence of unbalanced force, realize the pneumatic control valve set by the user signal accurate positioning, improve the positioning precision and linearity. Smart valve positioner software and hardware design and optimization, the control algorithm of research and the realization of the flow characteristic and experimental method. Control algorithm is the core of the control system software part, the experiment - the open-loop characteristics Piezoelectric valve based on PWM drive experiment, intake and exhaust condition, the minimum duty cycle, according to the characteristics of the pneumatic control valve, control algorithm research, successively completed five step switch control algorithm is improved, position type PID control algorithm, switch the PID, and study of self-tuning PID control algorithm, and closed-loop control experiment under no-load. Will eventually self-tuning PID control algorithm is applied to intelligent valve positioner.