Industrial-process control valves; part 8: noise considerations; section 2: laboratory measurement of noise generated by hydrodynamic flow through control valves (IEC 60534-8-2:1991); German version EN 60534-8-2:1993— 13 стр.
Industrial-process control valves - Part 8: Noise considerations; Section 1: Laboratory measurement of noise generated by aerodynamic flow through control valves (IEC 60534-8-1:1986); German version EN 60534-8-1:2000— 16 стр.