PLC based flow control system using a motor operated valve

The motor operated control valve as a final control element in any process control loop of a process plant may be controlled according to the set point needed by the process requirement. There are various types of control techniques of a motorized valve are presented by the different investigators. In the present paper, a Programmable Logic Controller (PLC) based flow control scheme using a motor [PMDC] operated valve has been described. The final calibration and experimental results reported in the paper reveal the linearity and reliability of the control system.