Electric single-seat regulating valve is a kind of pressure balance type regulator. Accept adjusting instruments to dc current signal, change the modulated medium flow, keep accused of process parameters in the given value. Widely used in electric power, metallurgy, chemical industry, petroleum, textile, pharmaceutical, paper and other industrial sectors of production automation control. About electric single-seat regulating valve in the job, however, cannot avoid the noise, so, how to deal with electric single-seat regulating valve noise? What are the measures? 1, using the method of thick wall pipe with thick wall tube is one of the acoustic treatment method of the road. Use thin wall can make noise increases 5 db, the thick wall pipe can reduce noise 0 ~ 20 db. The same diameter wall more thick, the same wall thickness pipe diameter, the greater the noise effect is better. Such as DN200 pipelines, the wall thickness of 6 respectively. 25, 6. 75, 8, 10, 12. 5, 15, 18, 20, 21. 5 mm, can reduce the noise, respectively 3. 5, - 2 ( The increase) , 0, 3, 6, 8, 11, 13, 14. 5 db. Of course, the higher the thicker the wall comes at a cost to the rotor pump. 2, noise elimination resonance method with electric single-seat regulating valve resonance, is energy superposition of strong noise and produce more than 100 decibels. Some show the strong vibration, little noise, some weak vibration, and the noise is very large; Some vibration and noise is larger. This noise to produce a single tones of the voice, the frequency is 3000 ~ 7000 hz. Obviously, eliminate resonance, noise disappear naturally. 3, the elimination of cavitation noise method is the main hydrodynamic cavitation noise source. A high-speed impact when the cavitation bubbles burst, make its local produce strong turbulence, cavitation noise. This noise has a wide range of frequencies, rattle, similar to the sound of a fluid containing sand. Eliminate and reduce the cavitation is a effective way to eliminate and reduce the noise. 4, choose low noise low noise valves according to the fluid by regulating valve Industrial Valves core and valve seat tortuous flow ( Hole, slot) Slow down gradually, in order to avoid in any point of the supersonic flow. Have a variety of forms, a variety of low noise of the structure of valve ( For specific system design) When used for selection. When the noise is not very big, choose low noise sleeve valve, can reduce noise 10 ~ 20 db, this is the most economical low noise valve. 5, sound-absorbing materials, it is also a more common, the most effective treatment method of the road. Can be used sound-absorbing material cover the noise source and the valve after the pipeline. It must be pointed out that because of the noise is transmitted through the fluid flow and long distance, so the sound-absorbing material package, using thick wall tube to where, where the effectiveness of the noise cancellation is terminated. In a certain extent, this is processing electric single-seat regulating valve noise is the biggest cost of a way! 6, series throttle method than the pressure of the regulator is high ( △P / P1≥0。 8) Situations, using the method of series throttle, is to spread out the total pressure drop after the regulator and valve throttling element. If use diffuser, porous current limit board, that is the most effective way to reduce noise. In order to get the best diffuser efficiency, must be installed according to each situation to design the diffuser ( The shape of the entity, size) The noise level, make the valve and the noise level of the same diffuser. 7, series muffler method deadened the noise of this law shall be applicable to the aerodynamic noise, it can effectively eliminate the noise of the fluid inside and control the noise level of transferred to the solid boundary layer. The high mass flow rate or high pressure drop ratio before and after the valve, this law is the most effective and economic. Using absorption type series muffler can greatly reduce the noise. From economic considerations, however, generally limited to decay to about 25 decibels.
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