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Eight ways to solve the electromagnetic stainless steel noise problem

1) Soundproof box method
Use soundproof boxes, houses and buildings to isolate electromagnetic stainless steel noise sources so that the noise of the external environment can be reduced to an acceptable level.
2) Tandem throttling
In the case where the pressure ratio of electromagnetic stainless steel is high (ΔP/P1 ≥ 0.8), the series throttle method is used to distribute the total pressure drop over the fixed throttle element behind the regulating valve and valve. If diffusers or porous restrictors are used, this is the most effective method of noise reduction. In order to obtain the best diffuser efficiency, the diffuser (shape and size of the solid) must be designed according to the installation conditions of each piece, so that the noise level generated by the valve and the noise level generated by the diffuser are the same.
3) Using sound-absorbing material method
This is also a more common and effective method of sound path processing. Sound-absorbing materials can be used to enclose the noise source and the post-valve line. It must be pointed out that because noise can be transmitted over long distances through fluid flow, where the sound-absorbing material is packaged and where the thick-walled pipe is used, the effectiveness of noise elimination 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 more expensive method.
4) Elimination of resonant noise
Only electromagnetic stainless steel resonance, there is a superposition of energy and produce more than 100 decibels of strong noise. Some performance is strong vibration, low noise, some weak vibration, and noise is very large; some vibration and noise are greater. This noise produces a monotonic sound whose frequency is generally 3000 to 7000 Hz. Obviously, resonance is eliminated and the noise naturally disappears. For the methods and examples, see 4), 5) and 6) in 4.5 above.
5) Elimination of cavitation noise
Cavitation is the main source of fluid dynamic noise. When cavitation occurs, bubbles burst to generate high-speed impacts, causing strong local turbulence and cavitation noise. This noise has a wide frequency range, creating a rattling sound that is similar to the sound produced by gravel in fluids. Eliminating and reducing cavitation is an effective way to eliminate and reduce noise.
6) Use thick-walled pipe method
The use of thick-walled tubes is one of the sound path treatment methods. The use of thin walls can increase the noise by 5 dB, and the use of thick-walled tubes can reduce the noise by 0-20 dB. The thicker the same pipe wall, the larger the pipe diameter of the same wall thickness, the better the noise reduction effect. Such as DN200 pipeline, the wall thickness were 6.25,6.75,8,10,12.5,15,18,20,21.5mm, can reduce the noise were -3.5, -2 (that is, increase), 0,3,6, 8,11,13,14.5 dB.
7) Tandem silencer method
This method is applicable to the silencing of aerodynamic noise, which can effectively eliminate the noise inside the fluid and suppress the noise level transmitted to the solid boundary layer. This method is most effective and economical for places with high mass flow or high pressure drop ratios before and after the valve. Using an absorption type tandem muffler can significantly reduce noise. However, from an economical point of view, it is generally limited to attenuation of about 25 dB.
8) Use low noise valve
The low-noise valve is designed to reduce the supersonic speed at any point in the flow path, according to the gradual deceleration of the fluid through the serpentine flow path (multi-channel, multi-channel) of the control valve spool, electromagnetic stainless steel seat. There are many types of low-noise valves of various structures (designed for special systems) for use when used. When the noise is not very large, the use of a low-noise sleeve valve can reduce the noise by 10 to 20 dB, which is the most economical low-noise valve.

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