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Title: Selection, Sizing And Operation Of Control Valves For Gases And Liquids
Author: Will Sjobeck
Source: 2012 International School of Hydrocarbon Measurement
Year Published: 2012
Abstract: The Instrumentation, Systems, and Automation Society (ISA) defines a control valve as a power operated device that modulates the fluid flow rate in a process control system. Process plants contain hundred, if not thousands of control loops to help a certain variable reach a desired set point. These loops consist of sensors, transmitters, and process controllers that receive information and calculate necessary action to achieve a set point upon system disturbance. The control valve is one of the most common final control elements that the process controller manages to maintain the set point. A well-sized and selected control valve will be able to keep the process variable as close as possible to the set point, making the control valve a crucial part of the process. This paper will cover the importance of proper control valve selection and sizing, liquid and gas/vapor service sizing and solutions, and types of control valves

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