How is the torque required to open and close a ball valve calculated?
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Excuse me, how is the torque for opening and closing a ball valve calculated? Please help, experts. It would be good to have an example, thank you
The torque varies from manufacturer to manufacturer. You can ask the valve manufacturer directly; they have the data
I just want to learn how to do the calculations on my own. Are there any recommended materials? Thanks, experts
Ask the valve manufacturers; I only know that it generally doesn’t exceed 250N
The torque on the sealing surface is calculated using finite element analysis, while the torque at the packing is determined from empirical values. The people who write manuals use old methods; some of those things are outdated. Some manufacturers apply treatments to their hard coatings in order to reduce the coefficient of friction, but these are variable factors… Those who are not professionals in valve design need not go to the extra trouble; moreover, manufacturers may not even measure the torque at the time of production