1, for the aerodynamic noise, aerodynamic noise is the main area in close to flow in the downstream recovery area, the flow state is phase chaos here, no rules and discontinuous, have strong turbulent flow and mixing effect. The solution is to reduce the flow velocity and reduced turbulence effect. 一) Porous type throttle. Sound power in area of the single flow throttling a square function relationship. Area change double sound power level will lead to corresponding changes in 6 db. At the same time, as the number of noise source such as independent role change 1 times, the sound power level changes only 3 db. The total noise reduction can take advantage of the many small throttle with a single or a few large throttling parts comparison method is derived, the noise of the jet interaction will not greater than the sum and the noise generated by each injection. On the other hand, due to the small hole jet noise frequency is high, the sensitivity of the human ear to high frequency noise is relatively low frequency decreases, namely, A weighted sound pressure level decibel is low, and the general noise sound pressure level of the quantization is done with A weighted unit dbA. Two aspects together to reduce the total noise of A weighted sound pressure level. b） Multi-stage decompression. The way using multistage Industrial Valves core, in series with the step-down step by step, disperse the pressure drop and the orifice of turbulence effect weakened. Gas medium can use labyrinth valve core, but flow channel cannot be too much, otherwise has no multistage effect on gas medium. c) Series muffler. Muffler is the diffuser with multiple holes, it is not only the application of porous noise reduction principle also increase downstream pipe diameter, and reduced the export flow velocity. Muffler is installed on the valve downstream piping. 2, for mechanical vibration caused by noise, only by improving the structure design of the valve itself to solve, such as increasing guide rod diameter and reduce the gap to limit, the transverse vibration or sleeve oriented limiting lateral vibration better, can also be more targeted to specific condition to design the body to avoid the resonance frequency.
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