1. Pressure reducing valve mechanical vibration noise;
2. Fluid dynamic noise;
3. Aerodynamic noise.
First, the noise generated by mechanical vibration The components of the pressure reducing valve will produce mechanical vibration when the fluid is active. The mechanical vibration can be divided into two forms:
1 low frequency vibration. This vibration is caused by the jet and pulsation of the medium, which is caused by the flow rate at the valve outlet being too fast, the piping arrangement being unfair, and the rigidity of the valve moving parts being insufficient.
2 high frequency vibration. This vibration will cause resonance when the natural frequency of the valve and the excitation frequency caused by the medium activity are the same. It is generated by the pressure reducing valve within a certain decompression range, and the noise changes greatly once the conditions are slightly changed. . This mechanical vibration noise has nothing to do with the speed of the medium, mostly due to the injustice of the design of the pressure reducing valve itself. The measure to reduce the mechanical vibration noise is to rationally design the clearance between the pressure reducing valve bushing and the valve stem, the machining accuracy, the natural frequency of the valve and the rigidity of the moving parts, and the correct selection of materials.
2. Fluid Dynamics Noise The hydrodynamic noise is generated by the turbulence and eddy currents after the fluid passes through the pressure reducing port of the pressure reducing valve. The process of its generation can be divided into two stages:
1 turbulent noise, that is, the noise generated by the interaction between the turbulent fluid and the pressure reducing valve or the inner surface of the pipeline, the frequency and noise level are relatively low, and generally does not constitute a noise problem.
2 Cavitation noise, that is, during the decompression process, when the fluid flow rate reaches a certain value, the fluid (liquid) begins to vaporize, and when the pressure of the bubbles in the liquid reaches a certain value, it will explode. When the bubble is exploding, it must generate high pressure and shock wave locally. The impact moment can reach 196 MPa, but the pressure is sharply attenuated in the place where the explosion center is away. This shock wave is a major factor in the cavitation and noise of the pressure relief valve. The measure to reduce the mechanical vibration noise is that when designing the pressure reducing valve, the decompression value of the pressure reducing valve must be controlled below the critical value, and the Zui is preferably below the initial value of Δp, because the actual decompression value of the pressure reducing valve is reached. At the initial value of Δp, the liquid begins to cavitation and the noise will increase sharply. In addition, pay attention to the direction of movement of the fluid medium relative to the flap.
3. Aerodynamic noise When a compressible fluid such as steam passes through a decompression portion in a pressure reducing valve, the mechanical energy of the fluid is converted into acoustic energy, which is basically described above. Basically, the pressure reducing valve generates noise. It is related to its own design and manufacturing process.
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