Floating Ball Valve Total Torque Calculator

Total operating torque: ball seal friction torque Mm, thrust pad friction torque Mu, packing friction torque Mt, and operating force F.

Mm = π(D2+D1)²·P·R·uT·(1+cosφ) / (32·cosφ)
Mu = π/64·uT·(DT+dT)³·P
M = Mm + Mt + Mu
F = M / L

Input Parameters

Seal Outer Dia D2 mm

Seal Inner Dia D1 mm

Design Pressure P MPa

Ball Radius R mm

Friction Coefficient uT -

Contact Angle φ deg

Thrust Pad Dia DT mm

Stem Dia dT mm

Packing Rings Z -

Packing Height h mm

Handle Lever Arm L mm

Ball Seal Torque Mm N.mm—

Thrust Pad Torque Mu N.mm—

Friction Torque Mt N.mm—

Total Torque M N.mm—

Operating Force F N—