Spherical Shell Ball Vs Solid Ball Valve - Student

kkala: In your first and last post you said the cv value for hollow balls are less due to higher resistance this makes sense to me. In your first post 3rd link this clarifys my thoughts on using hollow ball in the first place. I though the only benefit was cost adn weight and as they're only usually used in the bigger size valves- using hollow balls seem appropriate. Thank You for the break down in your last post- you've explained it in a logical way and so the conclusion is that i can assume difference of cv values are small.

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Art:As I have explained in previous posts, I am working WITH the manufacturer as part of my uni course. they have emplyed me to calculate and then later test their entire valve portfolio- so in hindsight i will get exact values of the flow coefficient, however as part of my project i have been asked to calculate/estimate the cv values to help me in becoming an engineer. As i am only at uni the company thougth this type of theoretical work would help me apply maths/physics to real life problems.

So yes I could ask the manufacturers but they are unsure themselves about their values hence why I am doing this project.

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Katmar: I think you're absolutely right - the reason that I am doing this project is because the technical data the company have is unreliable as the source of the information is unknown.

Thank You for your replies

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