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Engineering and Tech / Process Dynamics and Control 3 / Chapter 9 / Problem 9.8

Process Dynamics and Control | 3rd Edition | ISBN: 9780470128671 | Authors: Dale E. Seborg

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It has been suggested that the liquid flow rate in a large

Chapter 9, Problem 9.8

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QUESTION:

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 Cv value, that the other has a small Cv value, 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 seems to be the more promising: placing the control valves in series (Configuration I), or in parallel (Configuration II)? Briefly justify your answer.

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QUESTION:

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 Cv value, that the other has a small Cv value, 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 seems to be the more promising: placing the control valves in series (Configuration I), or in parallel (Configuration II)? Briefly justify your answer.

ANSWER:

Step 1 of 3

Configuration I:

The series configuration of valves are given below,

This series configuration will not be very effective because a large flow rate has to pass through a small control valve.

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