Operating torque synthesis for fixed-shaft ball valves: seat friction, packing, thrust pad, bearing, ball weight and O-ring components per Valve Design Manual.
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All six torque sources combined: seat, packing, thrust pad, bearing, ball weight, O-ring.
Mm from medium pressure and seat contact area is typically the largest component.
Includes O-ring drag from stem and body seals with friction coefficient input.
Mz from ball gravitational load on lower bearing for large valves.
Separate inputs for each contact pair: seat, packing, thrust, bearing, O-ring.
One of 12 modules in the complete Ball Valve Design Calculation suite.
Input operating pressure, ball/seat geometry, stem dimensions, and friction coefficients.
Calculate each of the 6 torque components from geometry and forces.
Add all components: M = Mm + Mt + Mu + Mc + Mz + Mo.
Total torque M feeds into stem strength verification and actuator sizing.
Enter your design parameters and get instant verification results.
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