Valve positioner
Thread Content
I have a question for everyone: how long can the correspondence between the signal and the valve position be guaranteed after one self-tuning of the valve positioner? Is it still the case that as long as the connection is reliable, the signal is permanently corresponding to the valve position? Why does it happen that, at the site, the valves that were self-tuned initially no longer have a matching signal and valve position after being in use for some time?
Under normal circumstances, once a valve positioner is set, its configuration should remain permanent. I remember that there seems to be a locking mechanism for positioning; if the connection is secure and not loose, the signal should match the valve position.
I agree with you; I also believe that as long as the connection is reliable in theory, the locator signal and the valve position should always correspond to each other!
For intelligently adjustable positioners, once the positioning is set correctly, the signal from the positioner should match the valve position feedback. If a discrepancy arises after some time of use, check whether the connections between them are loose; recalibrate and then tighten those connections