Fixed Trunnion Ball Valve Stem Torque Calculator

Total stem operating torque MM+MC+Mu+MT+MO with maximum allowable torque verification

Input Parameters

Design Pressure P MPa

Seat Loop Outside Dia DJH mm

Seal Inside Dia DMN mm

Seal Outside Dia DMW mm

Ball Radius R mm

Contact Angle α deg

Ball-Seal Friction μM -

Bearing Friction μC -

Bearing Journal dF mm

Thrust Pad Dia DT mm

Stem Diameter dT mm

Shoulder Friction μT -

Packing Depth hT mm

Packing Factor ψ -

O-ring Friction μO -

O-ring Section dO mm

O-ring Quantity ZO -

Spring Max Load Pn N

Spring Quantity N -

Shoulder Torque Mu N·mm

Allowable Stress [τN] MPa

Connection Dia d mm

Keyway Width b mm

Keyway Depth t mm