Question from a beginner: What is the difference between the minimum flow rate and the leakage rate of a control valve?
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By definition, the leakage rate refers to the leakage that occurs when the valve is fully closed (usually 0.1%-0.01% of the maximum flow rate). Does this full closure mean that the valve’s opening degree is zero? The minimum flow rate is the lower limit of the adjustable flow rate; what is the valve opening at this point? The valve opening degree I am referring to here corresponds to the 4-20mA signal
I understand that the leakage rate corresponds to the condition when the valve is completely closed, at which point the valve opening is naturally zero； The minimum flow rate is the lowest flow rate achievable when the valve is in its effective regulating state; the valve is not completely closed. To ensure stable regulation, it is necessary to keep the operation within the range between the minimum and maximum flow rates – otherwise, it indicates an incorrect valve selection.