Trunnion Ball Valve Bearing Face Pressure

Bearing face pressure verification for upper/lower stem journals, thrust pad and ball support bearing in fixed-shaft ball valves.

Open Calculator →

Core Formula:
q_c ≤ [q_c]

Check points:
• Upper stem journal: radial force → bearing pressure on upper bushing
• Lower stem journal: radial + ball weight → bearing pressure on lower bushing
• Thrust pad: axial force → bearing pressure on thrust washer
• Ball support: ball weight → bearing pressure on bottom seat/support
• q_c = F / A_bearing at each location
• All q_c ≤ [q_c] → PASS

Why This Calculator

4-Point Check

Upper/lower stem journals, thrust pad, and ball support bearing verified.

Radial + Axial Loads

Both radial (stem torque reaction) and axial (ball weight) forces included.

Material Allowable

[qc] from bearing material pair per Valve Design Manual tables.

Auto Pass/Fail

Instant judgment at each bearing location against allowable pressure.

Ball Weight Effect

Lower bearing and ball support include gravitational load component.

Part of Design Suite

One of 12 modules in the complete Ball Valve Design Calculation suite.

How It Works

Enter Parameters

Input stem diameters, bearing areas, forces, and allowable bearing pressures.

Compute Radial Forces

Calculate radial stem reaction forces from operating torque and geometry.

Calculate Bearing Pressures

qc = F / A at each of the 4 bearing locations.

Verify All Points

Compare each qc to [qc]; all must pass for bearing integrity.

Who Is It For

Valve Design Engineers | Bearing Specialists | Quality Inspectors | Manufacturing Engineers

Key Highlights

4-Point CheckValve Design ManualAuto JudgmentBall Weight

Ready to Calculate?

Enter your design parameters and get instant verification results.

Open Calculator →