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Anonymous Poster

valve throttling and selection guide

11/07/2008 12:19 AM

can anybody explain me requirement of throttling the valves

advantage and disadvantage of throttling

sudden closing of the valves

and any study material for selection of valves
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Sparkstation
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Location: Christchurch, (The Garden City), South Island, New Zealand
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Good Answers: 230
#1

Re: valve throttling and selection guide

11/07/2008 12:56 AM

Hello Guest,

Sudden closure may lead to the following:

  1. Cavitation
  2. Damage to valve seating
  3. Shock waves in liquid column, which may destroy pipework and instrumentation.

Those are my initial thoughts.

Now I am away for my dinner, and shall think about your questions further during my away time.

Kind Regards....

__________________
 "The number of inventions increases faster than the need for them at the time" - SparkY
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Anonymous Poster
#2

Re: valve throttling and selection guide

11/07/2008 2:12 PM

Hopefully you are throttling through a control valve that is designed to operate partially closed - note that most on/off valves such as gate valves will not stand-up to continuous throttling and may become damaged.

The drawbacks to throttling include lost horsepower, risk of damaging valve, and risk of cavitating.

Another method of flow control, instead of throttling, includes speed control on pumps through VFD's.

And yes - there is a great risk of waterhammer if you suddenly close a valve.
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