000			01151nam a22001217a 4500
999			_c16228 _d16228
245			_aIEC 60534-8-4:2015-Industrial-process control valves - Part 8-4 : _bNoise considerations - Prediction of noise generated by hydrodynamic flow
250			_a3.0
260			_aGeneva : _bInternational Electrotechnical Commission, _c2015.
300			_a63 p.
505			_aIEC 60534-8-4:2015 establishes a method to predict the noise generated in a control valve by liquid flow and the resulting noise level measured downstream of the valve and outside of the pipe. The noise may be generated both by normal turbulence and by liquid cavitation in the valve. Parts of the method are based on fundamental principles of acoustics, fluid mechanics, and mechanics. The method is validated by test data. This third edition cancels and replaces the second edition published 2005. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Hydrodynamic noise is predicted as a function of frequency and b) Elimination of the acoustic power ratio.
650			_aNoise
942			_cST