Fixed Trunnion Ball Valve / Practical Valve Design Manual / Bearing Supplier Data

Fixed Trunnion Ball Valve Stem Bearing Pressure

Bearing bushing compressive stress: σY = π/8·DJH²·P / (dF·H) versus allowable 180 MPa for 304SS+PTFE self-lubricating bushing.

Reference: Qw347X 10" DIB-I / ASME B16.34 / API 6D / Valve Design Manual

Why This Calculator

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Compressive stress on SF-1 self-lubricating bushing.

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Bearing load π/8·DJH²·P single-seat model.

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Allowable 180 MPa from bearing manufacturer sample.

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Safety factor λ < 0.67 per API 6D clause 7.20.

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Only four geometric inputs needed.

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Instant PASS/FAIL.

Enter seat loop diameter DJH.

Journal diameter dF and height H.

Set allowable compressive stress.

Check stress and safety factor.

Valve Design EngineersBearing SpecifiersQuality InspectorsMaintenance Engineers

304SS+PTFESF-1 BushingAPI 6D 7.20Auto Pass/Fail

Enter your design parameters and get instant verification results.