Floating Ball Valve Friction Torque Calculator

Packing friction force Ft, thrust pad friction force Fu, thrust pad specific pressure qt, and packing friction torque Mt.

Ft = 1.2π·uT·dT·Z·h·P
Fu = π/16·(DT+dT)²·uT·P
Mt = 0.6π·uT·Z·h·dT²·P
qt = (DT+dT)·P / [4·(DT−dT)] ≤ 15~20

Input Parameters

Friction Coefficient uT -

Stem Dia dT mm

Packing Rings Z -

Packing Height h mm

Design Pressure P MPa

Thrust Pad Dia DT mm

Allowable qt MPa

Packing Friction Ft N—

Thrust Pad Friction Fu N—

Thrust Pressure qt MPa—

Friction Torque Mt N.mm—

qt ≤ [qt]—