Seven independent calculation modules for fully-welded fixed trunnion ball valve (trunnion-mounted, lined seat) design verification per ASME B16.34, API 6D and the Valve Design Manual. Covers body wall thickness, DBB/DIB seat sealing, spring preload, stem torque, three-section stem strength, extrusion and bearing pressure with automatic PASS/FAIL verdicts.
Start with Body Wall →
ASME B16.34 App.F t = 1.5·Pc·(d/2)/(SF−0.6·Pc)
DBB sealing qMF ≤ q ≤ [q] with ring-area medium force
Spring preload QMY+FMM < Fn at 0.6 MPa condition
M = MM+MC+Mu+MT+MO five-component total torque
Sections I/II/III torsion with 2× torque mode
Stem head extrusion σZY = M1/(0.12(DT²−a²)h1)
Bushing σY = π/8·DJH²·P/(dF·H) vs 180 MPa
M1+M2: Body wall thickness and DBB/DIB seat sealing pressure
M3+M4: Spring preload adequacy and total stem torque
M5: Three-section torsional stress with API 6D factor
M6+M7: Stem head extrusion and bearing bushing pressure
Run individual modules with shared design inputs. Each calculator provides formula details, input validation, and automatic PASS/FAIL verdict.
Start with the body wall thickness calculator and work through all 7 modules.
Launch Body Wall Calculator