It is a transfer function that involves flow Q (s), converting vacation into U (s) control input, and converting vacation through the transmission function of the valve. The Gv transmission function of a control valve is a mathematical equation that describes the relationship between the input signal and the valve (usually the lift valve position). The output signal (usually flow) from the valve is a useful tool for modeling and designing control systems. The most common flow characteristic of a control valve is linear. In this case, the conversion function of the valve can be displayed as follows:
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