What valve can be used when the noise is high

Here are some of the well-known brands recognized in the valve industry, which are widely recognized and have a high reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following influential first-line brands of water system valves and industrial valves can be used as a reference, but for reference only: Suzhou Neway Valve, Shanghai Guanlong Valve, Shanghai Qizhong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

The main causes of noise from pressure reducing valves can be divided into the following three categories:

1.mechanical vibration noise of pressure reducing valves;

2.hydrodynamic noise;

3.Aerodynamic noise.

1. The parts of the noise pressure reducing valve generated by mechanical vibration will produce mechanical vibration when the fluid flows, and the mechanical vibration can be divided into two forms: low-frequency vibration. This vibration is caused by the jet and pulsation of the medium, and is caused by the rapid flow rate at the outlet of the valve, the unreasonable arrangement of the piping, and the insufficient rigidity of the moving parts of the valve.

High-frequency vibrations. When the natural frequency of the valve is consistent with the excitation frequency caused by the flow of the medium, the hydraulic control valve will cause resonance, which is generated by the pressure reducing valve within a certain range of pressure reduction, and once the conditions change slightly, its noise changes greatly. This kind of mechanical vibration noise has nothing to do with the flow speed of the medium, but is mostly caused by the unreasonable design of the pressure reducing valve itself.

Measures to reduce mechanical vibration and noise are to reasonably design the gap between the bushing and stem of the pressure reducing valve, the machining accuracy, the natural frequency of the valve, the rigidity of the moving parts, and the correct selection of materials.

2. Hydrodynamic Noise Hydrodynamic noise is generated by the turbulence and vortex after the fluid passes through the pressure reducing port of the pressure reducing valve, and the process of its generation can be divided into two stages: The turbulent noise of the electric actuator, that is, the noise generated by the interaction between the turbulent fluid and the inner surface of the pressure reducing valve or pipeline, its frequency and noise level are relatively low, and generally do not constitute a noise problem. Cavitation noise, that is, the pressure reducing valve in the process of pressure reduction, 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 be **.

When the bubble is in the first place, it is necessary to generate high pressure and shock waves locally, and the pressure of the self-operated control valve can reach 196MPa at the moment of impact, but far away from the center of the country, the pressure decays sharply. This shock wave is a major contributor to cavitation and noise in pressure reducing valves. The measure to reduce mechanical vibration and noise is that when designing the pressure reducing valve, the pressure reducing value of the pressure reducing valve must be controlled below the critical value, and it must be below the initial value of δp, because when the actual pressure reducing value of the pressure reducing valve reaches the initial value of δp, the liquid begins to cavitate, and the noise will increase sharply.

Self-actuated control valvesIn addition, attention should be paid to the direction of flow of the fluid medium relative to the disc.

3. Aerodynamic noiseWhen compressible fluids such as steam pass through the pressure reducing part in the pressure reducing valve, the mechanical energy of the fluid is converted into sound energy to produce In summary, fundamentally speaking, the noise generated by the pressure reducing valve is related to its own design and manufacturing process.

The runner design (selection) is unreasonable;

There are some conditions where it is difficult to design (select) a reasonable flow path.

For example, under the same working conditions, if you choose a straight-through full-bore ball valve, the noise will be much smaller than that of a globe valve.

Sleeve porous split flow valve. The most commonly used type of valve for low-noise control valves is the sleeve multi-hole split flow valve.

Low-noise control valves are commonly used with throttle control valves and butterfly valves. In the process of use, if there is a problem with the valve, it needs to be repaired and maintained accordingly. Common problems include clogged valve nozzles, leaking valves, inaccurate valve openings, and worn valve stems and discs.

When you encounter these problems, you can take different measures to maintain them. For the blockage of the valve nozzle, the method of cleaning the pipe can be taken to solve it. If there is a leak in the valve, it is necessary to check whether the valve seal is intact and whether the seal needs to be replaced.

If the valve opening is not accurate, you can check the valve transmission mechanism, and refuel and moisten the potato bush in time. In addition, it is important to regularly inspect and maintain the low-noise control valve to effectively extend the service life of the valve. Valves can be thoroughly inspected once a year, including cleaning pipes, inspecting seals, cleaning valves and transmission mechanisms, and more.