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Butterfly valve torque

Butterfly valve torque

Butterfly valve torque

(OP)
A long time ago in a job far away, I encountered an analytical method for calculating the torque of butterfly valves.  That library is no longer accessible to me and probably no longer exists.  I believe that it was for non-offset discs anyway.

Can someone supply or point me to an analytical method for calculating torque for a double/triple offset butterfly valve? (The torque difference between the two would only be at seating, anyway.)  

Thanks in advance,

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