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 工业过程控制阀.第8部分:噪声.第2节:控制阀液流噪声
