What is CAVITATION, FLASHING and CHOCKED FLOW in Control Valve (MOST SIMPLE EXPLANATION)

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what is cavitation in control valve
Cavitation occurs in control valves. This happens in liquid media applications. Cavitation occurs when localized low pressure causes bubbles to form and then suddenly collapse. First, the liquid evaporates to vapor. In a control valve, if the liquid's pressure falls below its fluid vapor pressure, vapor bubbles will form. And during pressure recovery these bubbles burst and very high velocity liquid molecules hit the valve and piping downstream. This phenomenon is called Cavitation.
Flashing in Control Valve
In flashing the liquid stays in vapor phase downstream of the valve.
Chocked Flow in Control valve
Usually when the DP across the valve increase the flow increases.
In chocked flow we reach a condition where, with increase in differential pressure there is no increase in the flow rate.
This phenomenon is called chocked flow in control valves.
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[@narendhraraju]

Very interesting asad thank you

[@scott3013]

Great video! Your use of visual aid was perfect for getting the idea across! Thanks!

[@AsadPassionateEngineer]

Thank you so much Scott, So happy to know that you liked the efforts😊 !!

[@anandanramachandran7415]

When the liquid passes through the control valve. If the Liquid’s pressure falls to near the vapour pressure vapour bubbles will form. During pressure recovery these bubbles will blast. This is called cavitation.

[@AsadPassionateEngineer]

👌

[@Paul-ss4re]

love your videos mate, keep up the good work

[@ela11035991]

Its really good to know about cv

[@shivangianand9509]

wow amazing video good

[@AsadPassionateEngineer]

Thank you so much Shivangi 😊

[@saquibkhan1230]

Please Make a video on control valve seat leakage calculation. And testing.

[@AsadPassionateEngineer]

As requested the video is ready Saquib. Here is the Link to the Video : ruclips.net/video/j7Ew0JYoMpo/видео.html

[@vickygec87]

how to check for passing in vessel bed from I&C point of view ..

[@geoffroyfalot3583]

Thank you

[@AsadPassionateEngineer]

Welcome! @Geoffroy Falot !!

[@bhagwansinghlodha939]

Sir, what's is the shut of pressure of control valve

[@ankurbhatnagar3241]

Good Asad

[@AsadPassionateEngineer]

Glad you found it useful, Ankur 😊

[@arbitrary_assumption]

Can u make a video on how to overcome these. Various methods

[@AsadPassionateEngineer]

Sure, I would be glad to !! 😊

[@manumani903]

during the valve sizing calculation using a software found a chcoked flow condition at the minimum flow . Then how to overcome this chcoked flow condition.?

[@AsadPassionateEngineer]

Your questions are really good. I am planning to make video on what are the possible solutions when we face Cavitation, Flashing and Chocked Flow 😊
Thanks for your comment