Proper operation of control valves
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The section I work in is equipped with a control valve; once automatic mode is activated, its feedback is not timely enough. It fails to respond promptly when the liquid level reaches the value I have set. For example, if the current liquid level is 50%, and I set the automatic liquid level at 40%, the valve opening degree is still only 20% when the level reaches 40%. As a result, the liquid level in the tank drops to 30%, at which point the valve closes and the flow rate at the pump’s outlet becomes almost zero. How can I adjust the parameters to eliminate this problem?
The feedback is never timely enough; the PID parameters can be adjusted. I didn’t understand your example
So, how is the feedback for the 0% and 100% opening position of that valve? If the feedback is accurate, using automatic mode shouldn’t lead to such problems
Is feedback used for adjustment? Did LZ get confused, or did we fail to understand?
The proportional-integral-differential (PID) control of the control valve can be adjusted to achieve the desired control effect.
I consulted an expert today, and they explained it to me; still, thank you all