1) to eliminate the resonance noise only regulating valve resonance, strong noise is superposed energy and produce more than 100 dB. Some of the strong performance of vibration, noise is not, and some weak vibration, and the noise is very large; some vibration and noise are larger. The noise produces a monotone voice, its frequency 3000 ~ 7000 Hz. Obviously, the elimination of resonance, the noise will disappear naturally. Methods and examples see above 4.5 in 4, 5, 6.
2) eliminate cavitation noise law fluid cavitation is the main power source of noise. Cavitation, the bubble burst generation high-speed impact, so that local produce strong turbulence, resulting in cavitation noise. This noise has a wide frequency range, resulting in rattle, and fluid containing sand and gravel similar sounds. Eliminate and reduce cavitation is an effective way to eliminate and reduce noise.
3) sound box method
The use of sound insulation, houses and buildings, to isolate the noise source inside, so that the external environment, noise is reduced to an acceptable range of people.
4) use low-noise valve low noise valve according to the gradual reduction of fluid through the valve, valve seat of the tortuous flow path, in order to avoid any point in the flow path generation supersonic. There are a variety of forms, a variety of low-noise valve structure (for special system design) for use when the selection. When the noise is not large, the selection of low noise sleeve valve, the noise can be reduced 10 to 20 decibels, which is the most economic low noise valves.
5) the use of thick-walled pipe method using thick-walled tube is one sound way approach. Use thin-wall noise can increase by 5 dB, using thick-walled tube can reduce 0 ~ 20 dB noise. With a diameter of the thicker wall of the same wall thickness, the greater the diameter, reduce noise better. Such as DN200 pipe, the wall thickness is respectively 6.25, 6.75, 8, 10, 12.5, 15, 18, 20, 21.5mm, can reduce the noise were -3.5, -2, 0, 3, 6, 8, 11, 13, 14.5 db. Of course, the thicker wall of the cost paid by the higher.
6) series throttle method in regulating valve pressure ratio of the occasion, the series throttle method, is the fixed throttling element total pressure drop is dispersed in the control valve and valve. As with the diffuser, porous limiting plate, which is the most effective way to reduce the noise. In order to obtain the best diffuser efficiency, have to design the diffuser according to each piece of installation, noise level so that the valve noise level and diffuser are produced by the same.
7) series muffler law law applies as aerodynamic noise silencer, it can effectively eliminate the noise and suppression of fluid noise transmitted to the solid boundary layer. On the quality of high flow or pressure drop is high and where the valve before and after, the most effective and economic law. Using the absorption series muffler can reduce the noise. However, from the economic consideration, generally limited to about 25 dB attenuation.
8) using sound-absorbing material method approach to sound way this is a more common, the most effective. Surround sound-absorbing materials available noise source and the valve pipeline. It must be pointed out that, because of the noise will be transmitted through the fluid flow and long-distance, where it is sound-absorbing materials package, the use of thick-walled tube to where, eliminate the effectiveness of noise ceases where. This method is not suitable for very high noise, the pipeline is not very long, because this is a more costly approach.
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