Trunnion Ball Valve Body Bolt Load

Body bolt load verification for the middle flange connection of ball valves per ASME VIII-1 gasket seating and operating conditions.

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Core Formula:
W = max(W_P, W_a)
W_P = operating bolt load, W_a = gasket seating load

Where:
• W_P = P · A_g + 2b · π · G · m · P (operating condition)
• W_a = b · π · G · y (gasket seating, no pressure)
• A_g = gasket area, G = gasket mean diameter
• b = gasket effective width, m = gasket factor, y = seating stress
• Verify W ≤ n · A_b · S_a (bolt capacity) → PASS

Why This Calculator

ASME VIII-1 Method

Operating and seating conditions per ASME VIII-1 Appendix 2 flange design.

Gasket Parameters

Supports spiral wound, flat, and ring joint gaskets with m and y factors.

Dual Condition Check

Both operating WP and seating Wa conditions verified against bolt capacity.

Flange Dimensions

Input bolt circle, gasket OD/ID per ASME B16.5 flange standards.

Auto Pass/Fail

Instant judgment: required W vs. bolt capacity n*Ab*Sa.

Part of Design Suite

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

How It Works

Enter Parameters

Input pressure, gasket dimensions, bolt count, and bolt area per ASME B16.5.

Compute Operating Load

WP = medium pressure force + gasket compression maintenance force.

Compute Seating Load

Wa = gasket seating stress required for initial seal at assembly.

Verify Bolt Capacity

W = max(WP, Wa) must not exceed total bolt capacity; pass/fail displayed.

Who Is It For

Valve Design Engineers | Flange Specialists | ASME Compliance Teams | Quality Inspectors

Key Highlights

ASME VIII-1ASME B16.5Dual ConditionAuto Judgment

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Enter your design parameters and get instant verification results.

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