The control valve is surging
Thread Content
The control valve with an electrically controlled gas is in the automatic mode for surging, and it is used to balance the temperature. It’s now set on automatic tracking, and the sounds of air intake and exhaust are much louder when it’s turned on or off. How should this be dealt with?
It is estimated that there is insufficient instrument air supply and the pressure is too low
Adjusting the PID parameters to prevent oscillation of the control valve will resolve the issue
Another possibility is that the parameters in the valve positioner might be incorrect. I saw someone who does maintenance demonstrate it; it’s a FISHER DVC6000PD positioner, but I can’t remember exactly which parameter it is
I’ve seen the EPP1000 locator in Yueqing act up by oscillating up and down at one position; loosening the throttle hole of the locator fixes it. You should give it a try too
It is best not to use electrical converters; the performance will improve by using electrical valve positioners.