Effect of pressure changes before the valve on the PID control parameters of automatic valves
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In front of the automatic valve is a pump, and the pressure at the pump’s outlet will decrease as the pump’s capacity to pump fluid declines. When the pressure is within normal ranges and the PID settings are optimized, changes in the pressure before the pump can cause the PID adjustment curve to perform poorly, even leading to significant fluctuations. Could someone help identify the reason for this? How should the PID be adjusted?
Please clarify, sir: is the control valve located on the main pipeline at the pump outlet to directly regulate the pipeline pressure, or is it located on the return pipeline to regulate the outlet pipeline pressure through the return flow?
First, what kind of pump is it? Also, how far are you from the pump outlet and what is the pressure there? And will adjusting the valve cause pressure to build up in the pump?
Adjust directly, no backflow, centrifugal pump!