How to Calibrate Control Valve Positioner!! control valve positioner calibration

the positioner of a control valve. Before calibrating the positioner of control valve, we have to familiar with all components of the instrument and required safety measures should be taken. We have to make sure that the pressure level of air supply is at required level, that is at 3-15 psi for almost all cases. Check whether the valve is positioned properly. The valve position is recorded at each test point. For calibrating the valve positioner separately, an input test pressure regulator or hand pump is connected and the applied pressure is monitored with a standard pressure. If supply air is not available, connect the required supply air to the positioner of control valve. The zero adjustment is done with the nozzle pin and by moving flapper adjustment, span adjustment is done.

For a pneumatic control valve, the calibration process is manual.

Make sure that we have the right cam for the positioner and is installed properly.
Next we need to check the feedback arm.
Keep the valve in 50 percent of the range when mounting the positioner.
Check whether the air supply is enough to work.
Check whether the positioner output is connected to valve actuator.
To begin calibration the operation, need to supply 4 milliamps to set the zero position.
Supply 20 milliamps and using the flapper adjust the span.
Check zero when span adjustment is finished and repeat the process until we have the correct travel.
Next ramp up and down the valve’s travel using 4, 8, 12, 16 and 20 milliamps.
Thus the calibrating process of pneumatic control valve is over.






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