defines equipment, methods, and procedures for obtaining laboratory measurements of sound pressure levels radiated by control valves and/or associated piping configurations, including fixed restrictions, through which compressible fluids are passing. Control valves discharging to atmosphere are excluded from this standard
IEC 60534-8-1 Ed. 2.0 b:2005
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Industrial-process control valves – Part 8-1: Noise considerations – Laboratory measurement of noise generated by aerodynamic flow through control valves