How to calculate the torque of the Industrial Valves. 1″- 600 lb stem torque calculation ( 1) Stem total moment MF = MQF + MFT ( 2) The ball and the seat of the friction torque MQF MQC = MQF1 + MQF2 MQF1 seat on ball pre-tightening force of friction torque MQF1 = 0. 3925 ( D2JH -D2MN) * ( 1+COSθ) * fM qM * * R MQF2 medium pressure produced by friction torque MQF2 = PI * * fM * R (P D2JH - 0. 5 D2MN - 0. 5 D2MW） ( 1+COSθ) / 8 cosine theta calculation results: MQF1 = 9043 63192 Nmm MQF Nmm MQF2 = = 72235 Nmm ( 3) Friction torque between packing and the valve stem MFT MFT = 0. 5 * FT * dF bT FT = dF bits of * * * P calculation results: finally MFL = 5840 Nmm results: MF = 78075 Nmm Industrial Valves torque calculation of concrete is: half the valve diameter ( D） The square of the x3. It is concluded that the area of the valve plate (14 一) , then multiplied by the bearing pressure ( P) ( The pressure valve work) Draw a shaft on the static pressure, multiplied by the coefficient of friction ( Look-up table, general steel friction coefficient 0. 1, steel for rubber friction coefficient 0. 15) , times the diameter of axle ( d） Divided by 1000 for a quick valve torque, the unit for cattle, m ( N。 m） Pneumatic actuator, electric actuator and reference TVC Industrial Valves torque of 1. 5 times.
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