1) Elimination of resonance noise method Only when the regulating valve resonates, can the energy superimpose and generate a strong noise of more than 100 decibels. Some have strong vibration and little noise, some have weak vibration but very loud noise, and some have large vibration and noise. This noise produces a single-tone sound, typically at a frequency of 3000-7000 Hz. Obviously, the resonance is eliminated, and the noise naturally disappears. (2) Elimination of cavitation noise method Cavitation is the main source of hydrodynamic noise. During cavitation, the bubble bursts to produce high-speed impact, which locally produces strong turbulence and produces cavitation noise. This noise has a wide frequency range and produces a rattling sound similar to that produced by fluid containing sand and gravel. Eliminating and reducing cavitation is an effective way to eliminate and reduce noise. (3) Using the thick-walled pipeline method Using thick-walled pipes is one of the sound path treatment methods. The use of thin walls can increase the noise by 5 decibels, and the use of thick-walled pipes can reduce the noise by 0 to 20 decibels. The thicker the wall of the same pipe diameter, the larger the pipe diameter of the same wall thickness, the better the noise reduction effect. For example, when the wall thickness of DN200 pipe is 6.25, 6.75, 8, 10, 12.5, 15, 18, 20, 21.5mm, the noise can be reduced by -3.5, -2 (ie increase), 0, 3, 6, 8, 11, 13, 14.5 dB. Of course, the thicker the wall, the higher the cost. (4) The sound-absorbing material method is also a common and most effective sound path treatment method. Noise source and post-valve lines can be covered with sound absorbing material. It must be pointed out that since noise can travel long distances through fluid flow, the effectiveness of noise cancellation ends wherever the sound-absorbing material is wrapped and where thick-walled pipes are used. 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. (5) Series muffler method This method is suitable for aerodynamic noise muffler, 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 where the mass flow rate is high or the pressure drop ratio before and after the valve is high. Noise can be greatly reduced by using absorbing in-line mufflers. However, economical considerations are generally limited to attenuation to about 25 dB. (6) The soundproof box method uses soundproof boxes, houses and buildings to isolate the noise source inside, so that the noise of the external environment is reduced to a range acceptable to people. (7) Serial throttling method When the pressure ratio of the regulating valve is high (△P/P1≥0.8), the series throttling method is adopted, which is to disperse the total pressure drop on the regulating valve and the fixed throttling element behind the valve. . Such as diffuser, porous restrictor plate, which is the most effective way to reduce noise. For optimum diffuser efficiency, the diffuser must be designed (physical shape, size) according to the installation of each piece so that the noise level produced by the valve is the same as the noise level produced by the diffuser. (8) Select low-noise valve The low-noise valve is based on the gradual deceleration of the fluid passing through the tortuous flow path (multi-channel, multi-channel) of the valve core and valve seat to avoid supersonic speed at any point in the flow path. There are various forms and structures of low-noise valves
(designed for special systems) for use. When the noise is not very large, the low-noise sleeve valve is selected, which can reduce the noise by 10-20 decibels, which is the most economical low-noise valve.
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