How to solve the noise of different conditions of the regulating valve

1) Eliminate the resonance noise method Only when the control valve resonance, only the energy superposition produces strong noise more than 100 dB, some performance is strong vibration, the noise is not big, some vibration is weak, but the noise is very large; some vibration And the noise is greater .This kind of noise produces a kind of single tone sound, its frequency is generally 3000- 7000 Hertz.Obviously, eliminates the resonance, the noise disappears naturally.Methods and examples see 4.5 of 4 above 4), 5) , 6). 2) Elimination of cavitation noise method Cavitation is the main source of hydrodynamic noise, and when cavitation, the bubble ruptures and produces high-speed impact locally, causing strong turbulence and generating cavitation noise. This type of noise has a wide frequency range and produces a treble sound similar to the sound of gravel contained in a fluid. Eliminating and reducing cavitation is an effective way to eliminate and reduce noise. 3) The use of thick-walled pipe method thick-walled pipe is one way to deal with the sound path. The use of thin walls can increase the noise by 5 dB, the use of thick-walled tubes can reduce noise by 0 to 20 dB. The same diameter wall thicker, the same wall thickness greater diameter, the better the noise reduction. Such as DN200 pipe, the wall thickness was 6.25,6.75,8,10,12.5,15,18,20,21.5mm, the noise can be reduced to -3.5, -2 (ie increase), 0,3,6, 8, 11, 13, 14.5 dB. Of course, the thicker the wall, the higher the cost of rotor cask red wine. 4) The use of sound-absorbing material method This is also a more common and most effective sound path approach. Sound-absorbing material can be used to surround the noise source and the valve after the pipeline. It must be pointed out that because of the long-distance propagation of noise through the fluid flow, where the sound-absorbing material is wrapped and where thick-walled tubes are used, the effectiveness of noise cancellation ends. This approach applies to the noise is not very high, the pipeline is not very long, because this is a more expensive way. 5) Tandem muffler method This method is suitable for silencing as aerodynamic noise, it can effectively eliminate the noise inside the fluid and inhibit the noise level transmitted to the solid boundary layer. This method is most effective and economical for places with high mass flow rate or high pressure drop before and after the valve. The use of absorption series silencer can significantly reduce the noise. However, economically, it is generally limited to decay to about 25 dB. 6) Sound Box Method Sound box, house and building are used to isolate the noise source inside, so as to reduce the external environment noise to the acceptable range. 7) Series throttling method When the pressure ratio of the regulating valve is high (ΔP / P1≥0.8), the series throttling method is to distribute the total pressure drop to the fixed throttling element after the regulating valve and the valve. Such as the use of diffusers, porous restrictor, which is the most effective way to reduce noise. In order to get the best diffuser efficiency, the diffuser (physical shape, size) must be designed for each piece of installation so that the valve produces the same noise level as the diffuser. 8) Selection of low-noise valve Low-noise valve Depending on the flow of fluid through the valve spool, adjust the valve seat of the tortuous flow path (multi-channel, multi-channel) of the gradual deceleration, to avoid any point in the flow path to produce supersonic. A variety of forms, a variety of structures of low-noise valves (designed for specialized systems) for use when used. When the noise is not large, the choice of low noise sleeve valve, can reduce the noise 10 to 20 dB, which is the most economical low noise valve.

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