Book: Process Dynamics and Control, Third Edition or Fourth Edition, by D. E. Seborg, T. F. Edgar, D. A. Mellichamp, F. J. Doyle III, John Wiley & Sons, Inc, 2011 Problem #5 -An equal percentage control valve (R = 50) is to be sized so that at the design conditions the fractionalstem position is l=0.50 with a liquid flow rate of 200 gpm and a valve pressure drop of APv= 40 psi.The pressure drop for the rest of the system is proportional to the flow rate squared, AP, = Kq?, and thetotal pressure drop for the control valve and system is constant at APy + AP, = 60 psi. The liquid has aspecific gravity of 0.90.(a) Determine the control valve coefficient Cy.(b) Calculate the maximum flow rate when the valve is fully open.(c) What is the pressure drop across the valve when the valve is fully open?

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Answered: Problem #5 - An equal percentage…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

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Book: Process Dynamics and Control, Third Edition or Fourth Edition, by D. E. Seborg, T. F. Edgar, D. A. Mellichamp, F. J. Doyle III, John Wiley & Sons, Inc, 2011

Problem #5 -
An equal percentage control valve (R = 50) is to be sized so that at the design conditions the fractional
stem position is l=0.50 with a liquid flow rate of 200 gpm and a valve pressure drop of APv= 40 psi.
The pressure drop for the rest of the system is proportional to the flow rate squared, AP, = Kq?, and the
total pressure drop for the control valve and system is constant at APy + AP, = 60 psi. The liquid has a
specific gravity of 0.90.
(a) Determine the control valve coefficient Cy.
(b) Calculate the maximum flow rate when the valve is fully open.
(c) What is the pressure drop across the valve when the valve is fully open?

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