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Title: Selection And Sizing Of Control Valves For Natural Gas
Author: Carol L. Nolte
Source: 2007 Appalachian Gas Measurement Short Course
Year Published: 2007
Abstract: The purpose of this paper is to help the user understand the information needed to properly select and size a control valve for natural gas service. With so many different manufactures of control valves we wont focus on one however the information listed is required by all manufactures in order to provide you with the best valve for the application. Most manufactures will assist you in sizing your application. The first step in sizing a control valve is to determine the required Cv or capacity required through the control valve at different operating conditions. It is not enough to size for one condition, rather all the conditions must be considered. Once you have completed sizing a valve for the given conditions you need to determine if that valve will operate and control well over all of those conditions. Most valves have an optimum control range. For instance a manufacture may only guarantee good control if the valves is operated between 10-85% of its capacity. Its important to know those limits. Keep in mind that that information may not be part of sizing tables or programs.

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