標(biāo)準(zhǔn)號：BS EN 60534-8-3-2011
中文標(biāo)準(zhǔn)名稱：工業(yè)過程控制閥.噪聲問題.控制閥的氣動噪聲預(yù)測法
英文標(biāo)準(zhǔn)名稱：Industrial-process control valves. Noise considerations. Control valve aerodynamic noise prediction method
標(biāo)準(zhǔn)類型：J16
發(fā)布日期：2011/6/30 12:00:00
實施日期：2011/6/30 12:00:00
中國標(biāo)準(zhǔn)分類號：J16
國際標(biāo)準(zhǔn)分類號：17.140.20;23.060.40;25.040.40
引用標(biāo)準(zhǔn)：IEC 60534;IEC 60534-1
適用范圍：This part of IEC 60534 establishes a theoretical method to predict the external soundpressurelevel generated in a control valve and within adjacent pipe expanders by the flowof compressible fluids.This method considers only single-phase dry gases and vapours and is based on the perfectgas laws.This standard addresses only the noise generated by aerodynamic processes in valves andin the connected piping. It does not consider any noise generated by reflections fromexternal surfaces or internally by pipe fittings, mechanical vibrations, unstable flow patternsand other unpredictable behaviour.It is assumed that the downstream piping is straight for a length of at least 2 m from thepoint where the noise measurement is made.This method is valid only for steel and steel alloy pipes (see Equations (21) and (23) in 5.5).The method is applicable to the following single-stage valves: globe (straight pattern andangle pattern), butterfly, rotary plug (eccentric, spherical), ball, and valves with cage trims.Specifically excluded are the full bore ball valves where the product FpC exceeds 50 % ofthe rated flow coefficient.For limitations on special low noise trims not covered by this standard, see Clause 8. Whenthe 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 usedThe Mach number limits in this standard are as follows: