Trunnion Ball Valve Bottom Cover Stiffness

Bottom cover deflection and rotation angle verification under pressure loading for fixed-shaft ball valves per beam bending theory.

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Core Formula:
y_max = F · c²(3l − c) / (6EI)
θ = F · c(l − c) / (2EI)

Where:
• F = total pressure load on cover (N)
• c = load application distance from support (mm)
• l = cover span between bolt centers (mm)
• E = elastic modulus of cover material (MPa)
• I = moment of inertia of cover cross-section (mm&sup4;)
• y_max ≤ [y] and θ ≤ [θ] → PASS

Why This Calculator

Deflection + Rotation

Both maximum deflection y and rotation angle theta verified for cover rigidity.

Beam Bending Model

Simply supported beam with offset load per classic structural mechanics.

Pressure Load Input

F from operating pressure acting on bottom cover area.

Auto Pass/Fail

Instant judgment: ymax <= [y] and theta <= [theta] for cover stiffness.

Material Elastic Modulus

E from cover material for accurate deflection calculation.

Part of Design Suite

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

How It Works

Enter Parameters

Input pressure, cover span, load position, cover thickness, and material E.

Compute Inertia

I = b*h^3/12 for rectangular cover cross-section.

Calculate Deflection

ymax = F*c^2*(3l-c) / (6EI) for simply supported beam.

Verify Stiffness

Check ymax <= allowable deflection and theta <= allowable rotation; pass/fail.

Who Is It For

Valve Design Engineers | Structural Analysts | Quality Inspectors | R&D Engineers

Key Highlights

Deflection + RotationBeam TheoryAuto JudgmentCover Rigidity

Ready to Calculate?

Enter your design parameters and get instant verification results.

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