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Treatment of Noisy Control Valves (1)
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Author:Alliance
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Published time: 2020-01-06
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When the fluid flows through the control valve, if the pressure difference between the front and back is too large, cavitation of the valve core, valve seat and other components will occur, which will cause the fluid to generate noise. The flow capacity value is selected too large, and a control valve with an appropriate flow capacity value must be selected again to overcome the noise caused by the small opening of the control valve.
When the fluid flows through the control valve, if the pressure difference between the front and back is too large, cavitation of the valve core, valve seat and other components will occur, which will cause the fluid to generate noise. The flow capacity value is selected too large, and a control valve with an appropriate flow capacity value must be selected again to overcome the noise caused by the small opening of the control valve. Here are some ways to eliminate noise:
1. Elimination of resonance noise method
Only when the control valve resonates, can there be energy superimposition and produce a strong noise of more than 100 decibels. Some manifest as strong vibration, low noise, and some weak vibration, but the noise is very large; some vibration and noise are relatively large. This noise produces a monotonic sound with a frequency of generally 3000 to 7000 Hz. Obviously, by eliminating resonance, the noise disappears naturally.
2.Elimination of cavitation noise method
Cavitation is the main source of hydrodynamic noise. During cavitation, the burst of the bubble produces a high-speed impact, causing strong local turbulence and cavitation noise. This noise has a wide frequency range and produces sounds similar to those made by sand and gravel in the fluid. Eliminating and reducing cavitation is an effective way to eliminate and reduce noise.
3. Use the thick wall pipeline method
The use of thick-walled tubes is one of the methods of sound path processing. The use of thin walls can increase noise by 5 decibels, and the use of thick walls can reduce noise by 0 to 20 decibels. The thicker the wall of the same pipe diameter, the larger the wall thickness and the larger the pipe diameter, the better the noise reduction effect. For example, when the DN200 pipeline has wall thicknesses of 6.25, 6.75, 8, 10, 12.5, 15, 18, 20, and 21.5mm, the noise can be reduced to -3.5, -2 (that is, increased), 0, 3, 6, and 8, 11, 13, 14.5 dB. Of course, the thicker the wall, the higher the cost.
4. Using sound-absorbing material method
This is also a more common and most effective method of sound path processing,which can use sound-absorbing materials can be used to surround noise sources and back-valve lines. Because noise can travel long distances through fluid flow, wherever sound-absorbing materials are packaged and where thick-walled tubes are used, the effectiveness of noise cancellation ends. This method is suitable for situations where the noise is not very high and the pipeline is not very long, because it is a relatively expensive method.
1. Elimination of resonance noise method
Only when the control valve resonates, can there be energy superimposition and produce a strong noise of more than 100 decibels. Some manifest as strong vibration, low noise, and some weak vibration, but the noise is very large; some vibration and noise are relatively large. This noise produces a monotonic sound with a frequency of generally 3000 to 7000 Hz. Obviously, by eliminating resonance, the noise disappears naturally.
2.Elimination of cavitation noise method
Cavitation is the main source of hydrodynamic noise. During cavitation, the burst of the bubble produces a high-speed impact, causing strong local turbulence and cavitation noise. This noise has a wide frequency range and produces sounds similar to those made by sand and gravel in the fluid. Eliminating and reducing cavitation is an effective way to eliminate and reduce noise.
3. Use the thick wall pipeline method
The use of thick-walled tubes is one of the methods of sound path processing. The use of thin walls can increase noise by 5 decibels, and the use of thick walls can reduce noise by 0 to 20 decibels. The thicker the wall of the same pipe diameter, the larger the wall thickness and the larger the pipe diameter, the better the noise reduction effect. For example, when the DN200 pipeline has wall thicknesses of 6.25, 6.75, 8, 10, 12.5, 15, 18, 20, and 21.5mm, the noise can be reduced to -3.5, -2 (that is, increased), 0, 3, 6, and 8, 11, 13, 14.5 dB. Of course, the thicker the wall, the higher the cost.
4. Using sound-absorbing material method
This is also a more common and most effective method of sound path processing,which can use sound-absorbing materials can be used to surround noise sources and back-valve lines. Because noise can travel long distances through fluid flow, wherever sound-absorbing materials are packaged and where thick-walled tubes are used, the effectiveness of noise cancellation ends. This method is suitable for situations where the noise is not very high and the pipeline is not very long, because it is a relatively expensive method.
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