DIN EN 60534-8-3:2011-10

This part of IEC 60534 establishes a theoretical method to predict the external sound pressure level generated in a control valve and within adjacent pipe expanders by the flow of compressible fluids. The method considers only single-phase dry gases and vapours and is based on the perfect gas laws. This standard addresses only the noise generated by aerodynamic processes in valves and in the connected piping. It does not consider any noise generated by reflections, mechanical vibrations, unstable flow patterns and other unpredictable behaviour. It is assumed that the downstream piping is straight for a length of at least 2 m from the point where the noise measurement is made. The method is valid only for steel and stainless steel pipes. The method is applicable to the following single-stage valves: globe (straight pattern and angle pattern), butterfly, rotary plug (eccentric, spherical), ball, and valves with cage trims. Specifically excluded are the full bore ball valves where the product F_pC exceeds 50 % of the rated flow coefficient. For limitations on special low noise trims not covered by this standard, see clause 8. When the Mach number in the valve outlet exceeds 0,3 for standard trim or 0,2 for low noise trim, the procedure in clause 7 is used. The responsible Committee is K 963 "Stellgeräte für strömende Stoffe" ("Industrial process control valves") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.