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Scope:This recommended practice is intended for control valves used in the control of process fluids and is not intended to apply to fluid power components. The reader and user should be familiar with fluid mechanics fundamentals and ISA standards ANSI/ISA-75.01.01-2007, Flow Equations for Sizing Control Valves, and ANSI/ISA-75.02.01-2008, Control Valve Capacity Test Procedures, on valve sizing and testing. Definitions of terms in this document are intended for general understanding; more rigorous definitions are found in the references.Noise measurement and prediction methods are beyond the current scope of this document. Methods of liquid flow noise measurement and prediction may be found in standards of the International Electrotechnical Commission, CEI/IEC documents 534-8-2 and 534-8-4. The relationship between cavitation parameters used in this recommended practice and those of the IEC documents is discussed in Annex B. Purpose:Cavitation as an applied science has not evolved to the highly refined level of that supporting the more traditional control valve sizing calculations. However, there is a great need by users and manufacturers alike for practical information in this area. The purpose of this document is to supply that information, and to that end it is necessarily broad in scope. It embodies several objectives:
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