ISA-RP75.23:1995(R2024)

ISA-RP75.23-1995 (R2024), Considerations for Evaluating Control Valve Cavitation, provides comprehensive guidance on evaluating control valve cavitation in process fluid control applications. It defines key terms and parameters related to cavitation, such as the cavitation index (σ) and various cavitation levels (incipient, constant, incipient damage, choking, maximum vibration), and discusses their significance for valve performance and selection.


This document addresses scale effects due to valve size and operating pressure, offering equations to appropriately adjust cavitation coefficients. It outlines methods for testing valves under cavitating conditions, including instrumentation, procedures, and data evaluation, and underscores the importance of laboratory qualification. Additionally, it covers factors influencing cavitation intensity, such as fluid properties and duty cycle, and presents an intensity index method to estimate damage potential and service life reduction.


Practical examples illustrate the application of the evaluation methods, while annexes provide detailed theoretical backgrounds, references and corrections for net pressure drop in high recovery valves. Overall, the document aims to educate users, standardize communication, guide valve selection, and encourage further research on cavitation in control valves.


Note: 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, IEC documents 60534-8-2 and 60534-8-4. The relationship between the cavitation parameters used in this document and those of the IEC documents is discussed in Annex B.