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valve the most obvious and one is not a question of comfort noise. For humans, noise can interfere with not only life, but also lead to permanent hearing failure and unsafe working environment. Studies have shown that long-term exposure to high noise levels, people’s hearing will be damaged. Hearing damage is progressive and irreversible, beginning with the high frequency failure, the top continues to fail the final hearing will result in a lower frequency of failure, which affects the ability to listen to normal language. When subjected to low frequency noise, the function of human organs such as heart or liver, may also be affected. In addition, noise and vibration will affect the associated performance and lead to valve pipe valve and adjacent equipment fatigue.

Essentially, when the vibration is generated in a wide range of atmospheric pressure changes, it will generate noise, and then as the noise transmitted to the eardrum. Eardrum to the speed of sound [which is 1100ft / s (335m / s) or 750m / h (1200km / h)] spread. Valve noise can be generated in many different ways, but the most common cause of valve geometry is generated by the turbulence caused by the spread of the downstream pipeline. In many cases, the noise could not help spread the valve body itself, because the body itself is rigid and sturdy.

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process turbulence will produce the vibration of the valve or valve components. Noise from the valve assembly within the random vibration generated by pressure fluctuations caused by collisions or by the fluid logistics obstacles, such as spool and disk or other closure components caused by the vibration. When the closure element continue to impact its director, the long time will lead to an explosion of noise. Because its frequency is lower than 1500Hz, it does not interfere with normal observers. However, these stem or with a guide shaft can damage the explosion limits of orientation and the seat surface. Valve parts explosion noise of another deputy secondary benefit is that the noise generated within the turbulent pressure valve to provide a warning message, so corrected before the accident is required. Vibration can also be certain in its natural resonance frequency of the valve parts, or cause, they are often at a lower noise level (less than 100dBA) found. This type of noise is characterized by a single tone or sound Weng Weng (frequency 300 ~ 700Hz), which produce high levels of stress in the material, leaving the component materials caused by material fatigue and weak. Noise but also by hydrodynamic or aerodynamic sound caused by the fluid. For liquid handling, fluid power noise by flow, cavitation and turbulence caused by flash, or when the fluid produced by the contraction of cross-section caused by speed. In short, the logistics of liquid produced by the noise does not produce a high noise level and for staff to endure. In severe cavitation or flashing operation, noise levels can reach a higher level must be changed within the installation process or in the anti-cavitation valve components for disposal.