How to calculate the split point in the two-position design of valves
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I want to use a PID controller to regulate two valves; the CV values, minimum and maximum flow rates of these two valves are known, as is their control ratio. To achieve smoother adjustment and minimize disruption to the user, I’d like to know how to calculate this split point. I hope those with more experience can offer some help; thank you!
If the characteristics of the two valves are identical (both linear or equal percentage type), and their operation mode is the same (both air-actuated open or air-actuated closed), the equivalent valve still needs to retain its original characteristics; therefore, it is necessary to select the split point correctly.
There are two common methods for determining division points: the continuous division method and the interval division method.