How to calculate the valve torque. 1 "-600LB Calculation of stem torque (1) Total stem torque MF = MQF + MFT (2) Friction torque between ball and valve seat MQF MQC = MQF1 + MQF2 MQF1 Frictional moment of seat pre-tightening force MQF1 = 0.3925 (D2JH? D2MN) * (1 + COS?) * QM * fM * R Friction torque generated by working pressure of MQF2 medium MQF2 = π * P * fM * R (D2JH- 0.5 D2MN- 0.5 D2MW) Calculated results: MQF1 = 9043 Nmm MQF2 = 63192Nmm MQF = 72235 Nmm (3) Friction torque between packing and valve stem MFT MFT = 0.5 * FT * dF FT = ψ * dF * bT * P Calculation result: MFL = 5840 Nmm Calculation result : MF = 78075 Nmm
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