BS EN 60534-8-3-2011 工业过程控制阀.噪声问题.控制阀的气动噪声预测法

标准号：BS EN 60534-8-3-2011
中文标准名称：工业过程控制阀.噪声问题.控制阀的气动噪声预测法
英文标准名称：Industrial-process control valves. Noise considerations. Control valve aerodynamic noise prediction method
标准类型：J16
发布日期：2011/6/30 12:00:00
实施日期：2011/6/30 12:00:00
中国标准分类号：J16
国际标准分类号：17.140.20;23.060.40;25.040.40
引用标准：IEC 60534;IEC 60534-1
适用范围：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: