Seven independent calculation modules for floating ball valve (API Q41F, 4 inch, 300Lb) design verification per the Valve Design Manual. Covers seal pressure, ball radius, seal force, friction torque, total torque, body wall thickness and stem strength with automatic PASS/FAIL verdicts.
Start with Seal Pressure →
Sealing specific pressure verification: must-pressure qb, design pressure q, and...
Ball radius determination and coverage verification: R range from bore diameter,...
Sealing force calculation for floating ball valve: medium pressure acting on the...
Packing friction force Ft, thrust pad friction force Fu, thrust pad specific pre...
Total operating torque: ball seal friction torque Mm, thrust pad friction torque...
Valve body wall thickness: thin-wall calculation method SB' and ANSI B16.5 table...
Multi-section stem torsional stress verification: I-I rectangular, II-II annular...
M1+M2+M3: Seal pressure, ball radius coverage and seal force
M4+M5: Friction torque components and total operating torque
M6+M7: Body wall thickness and multi-section stem strength
4 inch 300Lb floating ball valve standard
Polytetrafluoroethylene seal with 20 MPa allowable
Stainless 420 martensitic stem material
Run individual modules with shared design inputs. Each calculator provides formula details, input validation, and automatic PASS/FAIL verdict.