美国宾夕法尼亚州立大学噪声实验室研制成功一种新型阀门管道消声装置,既能减弱管道和阀门的噪声,又不象普通的附加消声器那样造成压力下降。它是一节具有吸声间壁和挡板的加长管,可以安装在控制阀的下侧,又能同阀门制成一个整体。试验表明该装置可将噪声减弱30分贝左右。(摘自 The United States Penn State University Noise Laboratory successfully developed a new type of valve pipe silencer, both to reduce the noise of pipes and valves, and not like the ordinary additional muffler that caused the pressure drop. It is an extension tube with acoustical walls and baffles that can be mounted on the underside of the control valve and integrated with the valve. Experiments show that the device can reduce the noise about 30 decibels. (Excerpted from