valve noise meaning in Chinese

电子管噪声
阀门噪声

And concerning boundary conditions along piping system are properly set . futhermore , vertex sound is discussed in this paper . effect of the noise reduction about the mufflers is analysed , and a lot of trials is used to testify exist of valve noise and influence to pipe system . there kinds of mufflers are proved that they can reduce the fluid niose of pipe system by a large number of experimentation
对噪声的抑制装置? ?消声器的降噪效果进行了分析，并结合实际工作建立了模拟海水管路试验台架，通过一系列试验，说明阀门噪声的存在，及其对管路流噪声的影响，证明设计的三种结构消声器对管路流噪声的良好消减效果。