Analysis of Noise Causes of Pressure Reducing Valve
Classification:
Release Time：2018-06-04
The causes of noise can be divided into the following three categories: 1, the valve mechanical vibration noise; 2, fluid dynamics noise; 3, aerodynamic noise. 1. mechanical vibration noise pressure reducing valve parts in the fluid flow will produce mechanical vibration, 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 outlet of the valve is too fast, the pipeline arrangement is unreasonable, and the rigidity of the movable parts of the valve is insufficient. ② High frequency vibration. This vibration in the natural frequency of the valve and the medium flow caused by the excitation frequency is consistent, hydraulic
The causes of noise can be divided into the following three categories:
1. Mechanical vibration noise of pressure reducing valve;
2. Fluid dynamic noise;
3. Aerodynamic noise.
Noise from 1. mechanical vibration
Pressure reducing valve parts in the fluid flow when the pneumatic control valve will produce mechanical vibration, 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 outlet of the valve is too fast, the pipeline arrangement is unreasonable, and the rigidity of the movable parts of the valve is insufficient.
② High frequency vibration. This vibration in the natural frequency of the valve and the medium flow caused by the excitation frequency is consistent, the hydraulic control valve will cause resonance, it is the pressure reducing valve in a certain range of pressure relief, and once the conditions change slightly, the noise change is very big. This mechanical vibration noise has nothing to do with the medium flow speed, and is mostly due to the unreasonable design of the pressure reducing valve itself. The measures to reduce the mechanical vibration noise are to reasonably design the clearance of the valve bushing and the valve stem, the machining accuracy, the natural frequency of the valve and the rigidity of the movable parts, and the correct selection of materials.
2. hydrodynamic noise
Fluid dynamics noise is generated by the fluid through the pressure relief valve after the mouth of the turbulence and vortex, the process can be divided into two stages:
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, its frequency and noise level are relatively low, and generally does not constitute a noise problem.
Cavitation noise, that is, the pressure reducing valve in the process of decompression, when the fluid flow rate reaches a certain value, the fluid (liquid) began to vaporize, when the pressure of the bubbles in the liquid reaches a certain value, it will explode. Bubbles in the explosion, to produce high pressure and shock wave in the local, self-regulating valve the impact of the instantaneous pressure up to 196 MPa, but away from the center of the explosion, the pressure decay sharply. This shock wave is a major factor in the cavitation and noise of the pressure reducing valve. Measures to reduce the mechanical vibration noise is in the design of the pressure reducing valve, the pressure reducing valve value must be controlled below the critical value, and preferably below the initial value, because the actual pressure reducing valve to reach the initial value, the liquid began to produce cavitation, and the noise will increase sharply. Self-operated control valve In addition, pay attention to the flow direction of the fluid medium relative to the valve flap.
3. aerodynamic noise
When the steam and other compressible fluid through the pressure reducing valve in the decompression site, the mechanical energy of the fluid is converted into sound energy. In summary, fundamentally speaking, the noise generated by the pressure reducing valve is related to its own design and manufacturing process.
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