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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 AP, = 40 psi. The pressure drop for the rest of the system is proportional to the flow rate squared, AP, = Kq², and the total pressure drop for the control valve and system is constant at APy + APs = 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?

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 AP, = 40 psi. The pressure drop for the rest of the system is proportional to the flow rate squared, AP, = Kq², and the total pressure drop for the control valve and system is constant at APy + APs = 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?

Introduction to Chemical Engineering Thermodynamics
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
Section: Chapter Questions
Problem 1.1P
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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 APy = 40 psi. The pressure drop for the rest of the system is proportional to the flow rate squared, APs = Kq², and the total pressure drop for the control valve and system is constant at APv + APs = 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?
Transcribed Image Text: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 APy = 40 psi. The pressure drop for the rest of the system is proportional to the flow rate squared, APs = Kq², and the total pressure drop for the control valve and system is constant at APv + APs = 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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