标准摘要
[中文适用范围]： IEC 60534 的这一部分建立了一种理论方法来预测控制阀和相邻扩管器内由可压缩流体流动产生的外部声压级。该方法仅考虑单相干燥气体和蒸汽，并且基于完美的气体定律。该标准仅针对阀门和连接管道中的空气动力过程产生的噪音。它不考虑由外表面或内部管道配件的反射、机械振动、不稳定的流动模式和其他不可预测的行为产生的任何噪音。假设下游管道距离噪声测量点至少 2 m 的长度是直的。该方法仅对钢管和钢合金管有效（见5.5中的公式（21）和（23））。该方法适用于以下单级阀门：截止阀（直型和角型）、蝶阀、旋转塞（偏心、球形）、球阀和带笼式阀内件的阀门。特别排除的是产品 FpC 超过额定流量系数 50% 的全通径球阀。对于本标准中未涵盖的特殊低噪声阀内件的限制，请参阅第 8 条。当阀门出口的马赫数超过标准阀内件的 0.3 或低噪声阀内件的马赫数 0.2 时，将使用第 7 条中的程序。本标准的数量限制如下： [外文原描述]： IEC 60534-8-3:2010 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. This method considers only single-phase dry gases and vapours and is based on the perfect gas laws. 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 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 FpC exceeds 50 % of the rated flow coefficient. This third edition cancels and replaces the second edition published in 2000. This edition constitutes a technical revision. The significant technical changes with respect to the previous edition are as follows: - predicting noise as a function of frequency; - using laboratory data to determine the acoustical efficiency factor.
英文名称Industrial-process control valves - Part 8-3: Noise considerations - Control valve aerodynamic noise prediction method