原文：
           减压阀产生噪音的原因可以分为如下三大类： 1. 减压阀机械振动噪音；2. 流体动力学噪音；3.空气动力学噪音。

       一、机械振动产生的噪音 减压阀的零部件在流体流动时气动调节阀会产生机械振动，机械振动又可分为两种形式： ① 低频振动。这种振动是由介质的射流和脉动造成的，其产生原因在于阀出口处的流速太快，管路布置不合理以及阀活动零件的刚性不足等。② 高频振动。这种振动在阀的自然频率和介质流动所造成的激励频率一致时，水力控制阀将引起共振，它是减压阀在一定减压范围内产生的，而且一旦条件稍有变化，其噪音变化就很大。这种机械振动噪音与介质流动速度无关，多是由于减压阀自身设计不合理产生。 减小机械振动噪声的措施是，合理地设计减压阀衬套和阀杆的间隙、机械加工精度、阀的自然频率以及活动零件的刚性，正确地选用材料等。

       二、流体动力学噪音 流体动力学噪音是由流体通过减压阀的减压口之后的紊流及涡流所产生的，其产生的过程可以分为两个阶段： ① 电动执行器紊流噪音，即由紊流流体和减压阀或管路内表面相互作用而产生的噪音，其频率和噪音级都比较低，一般并不构成噪音问题。 ② 汽蚀噪音，即减压阀在减压过程中，当流体流速达到一定值时，流体(液体)就开始汽化，当液体中的气泡所受到的压力达到一定值时，就会爆炸。气泡在爆炸时，要在局部产生很高的压力和冲击波，自力式调节阀这个冲击瞬间压力可达196 MPa，但是远离爆炸中心的地方，压力急剧衰减。这个冲击波是造成减压阀汽蚀和噪音的一个主要因素。 减小机械振动噪声的措施是在设计减压阀时，必须把减压阀的减压值控制在临界值以下，而且，最好是在Δp初始以下,因为减压阀的实际减压值达到Δp初始值时，液体就开始产生汽蚀，而且噪声将急剧增大。自力式控制阀此外，还要注意相对于阀瓣的流体介质的流动方向。

         三、空气动力学噪声 当蒸汽等可压缩性流体通过减压阀内的减压部位时，流体的机械能转换为声能而产生 综上所述，从根本上来说，减压阀产生噪音都跟自身的设计和制造工艺有关。

“ Valve noise of the three major reasons ”是由中国减压阀网提供的阀门行业新闻，译文仅供参考。另外，中国减压阀网还提供相关产品搜索： 氢气减压阀、 氮气减压阀、 氧气减压阀、 空气减压阀、 更多减压阀产品 等。

译文：
               Valve causes the noise can be divided into the following three categories: 1. Valve mechanical vibration and noise; 2. Fluid dynamics noise; 3. Aerodynamic noise. First, mechanical vibration noise reducingInstrumentation Ball Valves valve components in the fluid flow will produce mechanical vibrations, mechanical vibrations can be divided into two forms: ① low frequency vibration. This vibration is caused by the medium jet and pulse, and its causes is the fast flow valve outlet, pipe and valve arrangement unreasonable lack of moving parts of the rigidity. ② High-frequency vibration. That the natural frequency of vibration in the valve and the medium flow caused by the same excitation frequency, it will cause resonance, which is a certain vacuum pressure reducing valve produced within, and once the conditions change slightly, the noise changed to a great . This mechanical vibration and noise has Needle & Gauge Valves nothing to do with the medium flow rate, and more unreasonable because of pressure reducing valve produced their own designs. Measures to reduce the mechanical vibration is reasonably designed valve sleeve and valve stem clearance, precision machining, valve natural frequency and the moving parts of the rigid, properly selected materials. Second, the noise of fluid dynamics fluid dynamics fluid through the noise is from the mouth after the decompression valve and the vortex generated by the turbulence, and its production process Safety Relief Valves can be divided into two stages: ① turbulent noise, that is disordered flow of fluid and valve or pipe inner surface interaction noise, the frequency and noise levels are relatively low, generally does not constitute a noise problem. ② cavitation noise, that valve in the decompression process, when the fluid velocity reaches a certain value, the fluid (liquid) to begin vaporization, when the liquid in the bubble the pressure reaches a certain value, it will explode. Bubbles in the explosion, local produce in a high pressure and shock, the impact of instant pressure up to 196 MPa, but away from the explosionInstrument Manifolds center where the pressure rapidly decay. The shock was caused by valve cavitation and noise a major factor. Measures to reduce the mechanical vibration is in the design of pressure reducing valve when the pressure relief valve must be the value of control threshold values, and, preferably in the initial Δp below because the actual Balance Valves decompression valve value reached the initial value of Δp, the liquid will begin to cavitation, and noise will increase dramatically. In addition, we note that relative to the valve flap in the direction of the flow of fluid medium. 3, aerodynamic noise when the steam and other compressible fluid through the valve in the vacuum position, the fluid mechanical energy into sound energy generated In summary, fundamentally, the pressure reducing valve noise are related to their own design and manufacturing process related.

原文来源：http://www.1jianyafa.com/

2010-08-27 02:14

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