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Breakaway torque for ball valve
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Hello jethrolawing!
I would recommend you to check previous discussions on the topic in this forum and others. I believe the answer is already given there.
Torque is normally measured (not calculated) under (simulated) operating conditions, and will vary with a factor of at least 1:3, others will say 1:5 or 1:10 in 'real life.'
So: what is the purpose of your calculation? Giving the normal torque in continious operation by a 'nice' fluid, for instance pure, thin oil without impurities, or selecting the construction details for the spindle top when applying a 10-times normal force?
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