150LB Plug Valve Plug Circumferential Force

Plug body circumferential force, operating torque and handle effort per Valve Design Manual Table 3-79. Formula: MF = MI + MT + MJ, QS = MF/L

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Standard: Valve Design Manual Table 3-79 | Formula: MF = MI + MT + MJ, QS = MF/L

150LB Plug Valve Plug Circumferential Force

Why This Calculator

Total Torque Breakdown

MF = MI + MT + MJ with each component calculated separately.

Seal Face Torque

MI linearized from book's data substitution (formula missing in source).

Packing Friction

MT computed via ψ·dF·bT·P coefficient method.

Medium Force Torque

MJ from Bernoulli medium force on plug body.

Handle Effort Check

QS compared against API 6D allowable 360 N.

Audit Corrected

Removed erroneous 'different pressure torque' section from source book.

How It Works

Set Pressure

Input nominal pressure PN (MPa).

Plug Geometry

Input plug major/minor diameters D1, D2 and friction fm.

Stem & Packing

Input stem dF, packing ψ/hT/bT parameters.

Verify Handle

Compare handle effort QS to API 6D allowable.

Set Material

Input allowable tensile stress [σL] for body material.

Add Corrosion

Specify corrosion allowance C based on service conditions.

Verify Thickness

Compare actual body thickness SB to calculated S'B.