Control Valve Characteristics Selection | MOST SIMPLE EXPLANATION

All control valves have an inherent flow characteristic that defines the relationship between ‘valve opening’ and flowrate under constant pressure conditions
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asad-shaikh-in...

[@AsadPassionateEngineer]

🔴Link to Instrumentation Crash Course for Professionals (FREE course) 1500+ Students have already taken this course. 👉asad-shaikh-instrumentation.ck.page/06e66ac455 Students have said to make the course course PAID ( Because of the value they received from the course) Let me know your feedback

[@balajiarni]

Asad Shaikh - this video is what I am searching for long time. Thanks for making this video. Very easy to understand

[@AsadPassionateEngineer]

Most welcome Balaji, glad you liked it !!

[@mohsenk5985]

Mon ami, vous êtes vraiment excellent, merci à vous...

[@saquibkhan1230]

Please make a video control valve seat leakage calculation.

[@AsadPassionateEngineer]

As requested the video is ready Saquib. Here is the Link to the Video : kzbin.info/www/bejne/oGioqGOAjtSAptE

[@abhipathak4937]

Thank you Asad for making our life easy by making this video

[@AsadPassionateEngineer]

Most welcome dear abhi 😊

[@Timothymukansi]

This was a very helpful video. Thanks for recommending the process control book as well.

[@AsadPassionateEngineer]

Glad you enjoyed it! @Timothymukansi 😊

[@hareem0305]

Hey Asad , i am wondering that at 1:20 why the installed characteristic plot will always be same as Quick opening. I mean the graph of installed chars could look like equal % and then to compensate it we would need Quick opening. Note that both are non linear and operating DP in a live plant may not always vary as the graph shown in video.

[@AsadPassionateEngineer]

Dear brother, You are correct, the graph is an example to demonstrate the concept . The end covers the type of characteristics to be selected as per bela liptak table.

[@vigneshnithi4384]

hi asad, how to find the Differential pressure across the valve for minimum flowrate if i don't know downstream pressure ?? how to do preliminary sizing if i don't know the downstream pressure of control valve

[@CharleyGR]

Well done! Thank you for sharing this

[@AsadPassionateEngineer]

Glad you enjoyed it!

[@kmh6578]

So what about quick openning, when's it used

[@atulbhagat1000]

Which valve characteristics used for temperature control ?

[@khunteatishanil6546]

can u please make detail video on control station assembly?

[@AsadPassionateEngineer]

oh sure control station is a pretty vast but very interesting topic !!

[@milindketkar9059]

we have been sizing valves with Linear characteristics for high pressure reduction while equal % we have been using for flow control valves . That was always our rule of thumb unless there is a change of thought process over the years however with advancement in PID controls and DCS system - the valve travel can be made to behave the way we want

[@AsadPassionateEngineer]

Very true ..... Just it is important to configure the valve correctly !! Thanks for sharing your knowledge ☺️

[@Practical.instrumentation]

Very informative 😮

[@fltp1888]

I have a positioner attached to my control valve. If my control valve inherent cahracteristic is equal percentage, then what characteristic should I select when I configure the optimisation in my positioner setting? Is it set it as linear or equal percentage? I noticed the characteristic in our positioner setting is always set as linear instead of equal percentage.

[@ProductProcess]

@fltp1888 Yes, you are positioner setting should be normally linear. Valve Characteristics is determined by the shape of Plug. Now, suppose you want to change the valve performance without changing the plug, then you should change the positioner settings.

[@cck1496]

Good video. Can anyone tell please what is the difference between "equal percentage" and "linear"? Thanks.

[@AsadPassionateEngineer]

Sure thanks for your comment will start to work on it right away

[@vikaspatel4782]

What if Difference between P MAx and P Min is more than 5 ??

[@rndtechinfokannada]

Hi sir please explain always in detail explanation is not understandable for freshers are the persons who is new to subject is not at all able to understand please give me a brief background detail about each term so that any new person or a new engineer who wants to learn this topics he will easily understand your explanation is only if somebody expert in wall design he can understand it's not for the beginners

[@rakeshgaund5724]

Sir ye video Hindi me banye sir

[@AbhishekKumar-tb6vv]

Hindhi mai batao yar