Floating ball valve torque
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Valve Design Manual, 3rd Edition – Torque Calculation for Floating Ball Valves: What does the frictional torque at the stem head refer to? How was this formula derived?
Friction torque at the contact point between the valve stem and the valve body
The third edition contains ready-made formulas
Hello! First of all, thank you for your answer. However, there is no direct contact between the valve stem and the valve body; the formula in version 3 clearly does not take into account the friction with the thrust washer. Please explain in detail; I really don’t understand.
Do you use the formulas from the valve design manual for ball valve design? It’s not appropriate, right? There’s a book titled \"Selection and Design of Ball Valves\", and the formulas in it are much more reasonable
I haven’t read the valve design manual; from what I understand, it’s the frictional torque between the valve stem and the packing