IEC 60534-8-4:20 15建立了一种方法来预测由液体流动在控制阀中产生的噪声以及在阀下游和管道外部测量的所得噪声水平。噪声可以由阀中的正常湍流和液体空化两者产生。该方法的一部分基于声学、流体力学和力学的基本原理。通过试验数据验证了该方法的有效性。第三版取消并取代了2005年出版的第二版。本版构成技术修订版。与上一版相比，此版本包括以下重大技术变更: a)流体动力噪声被预测为频率的函数，并且 b)消除声功率比。

IEC 60534-8-4:2015 establishes a method to predict the noise generated in a control valve by liquid flow and the resulting noise level measured downstream of the valve and outside of the pipe. The noise may be generated both by normal turbulence and by liquid cavitation in the valve. Parts of the method are based on fundamental principles of acoustics, fluid mechanics, and mechanics. The method is validated by test data. This third edition cancels and replaces the second edition published 2005. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) Hydrodynamic noise is predicted as a function of frequency and
b) Elimination of the acoustic power ratio.