It has been suggested that the liquid flow rate in a large diameter pipeline could be better regulated by using two control valves instead of one. Suppose that one control valve has a large C_v value, that the other has a small C_vvalue, and that the flow controller will primarily adjust the smaller valve while also making occasional adjustments to the large valve, as needed. Which of the two alternative configurations in Fig. E9.7 seems to be the more promising: placing the control valves in series (Configuration I), or in parallel (Configuration II)? 

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Configuration I Configuration II Figure E9.7