Sound level for on off valves 2

[Flo65]

Do you know if sound level dbA is also needed for on/off actuated ball valves ? I thought it was only for regulating valves.

thank you for help.

 

[BigInch]

Not usually, if they indeed are used for on/off service and the valve is not sized too small. The problem comes from high pressure drops and fluid velocity across a valve that is partially open, so if you're full open or fully closed and the valve size is close to pipe size, you shouldn't get those high velocities.

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"Pumping systems account for nearly 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[bcd]

Like most rules of thumb, there are exceptions. If you droping a thousand psi air from a large tank to atmosphere through a full open 1/2 inch ball valve, you will have a noise problem. If the valve is in a piping system and the system is designed to limit flow velocities to normal levels, then no, noise is not a concern with either full or reduced port ball valves.