Calibration of Control Valve

No.

You may try it & see hunting in o/p of I/P as well as control valve due to bi- directional property of AC current.

Usualy control valve(cv),received signal pneumatic 3 to 15 psi or 6 to 30 psi.this cv can direct received signal or use I/P converter.we talk about cv with I/P.

instal supply about 30 psi to I/P.connect signal cable to I/P,if you use mA calibrator,please give input 4mA,look at position scale of opening cv must be 0% (use zero adj I/P to correct opening),give 20 mA and opening will be 100% (use span adj for correct),next give 8 mA for 25%,12mA for 50% and 16mA for 75%.Remember you will found control valve ATO (air to open) or ATC ( air to close).good luck)

First of all thank you for your reply against my query.

then can you help me to tell the procedure of calibration and maintenance of Pressure Regulating Valve(PRV). And how can i do maintenance and calibration of positioner in PRV?

Calibration? Eh?

They can be set up, if that is what is meant by the question, by following the manufacturer's instructions.

control valve can be calibrated automatically by using hart communicator. just follow the step instructor from the calibrator.