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Title: Control Valve Sizing Using The New Standards
Author: Les Driskell
Source: 1976 Appalachian Gas Measurement Short Course
Year Published: 1976
Abstract: The new standards for control valve sizing represent a significant advancement over formulas contained in past standards. Besides establishing rules for uniform testing methods to measure the sizing coefficients, improved methods are provided for handling flashing liquids and the flow of viscous and compressible fluids. These improvements represent only another step along the way in our quest for understanding the flow of fluids through throttling devices having complex shapes. There are still common flow prolems which cannot be adequately solved by the methods of the standards. Some fluids do not behave according to our wishes. And some valve styles are unruly and behave in a most obstinate manner. It remains for the future to improve upon out methods of predicting the flow through a valve so that these areas of uncertainty can be removed. The limitations of the standards, as well as their qualities, will be described in this paper.

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