Valve Standard Reference
ASME B16.25
AmericanButtwelding Ends
ASME B16.
Overview — ASME B16.25
ASME B16.25 defines the dimensional requirements for butt-welding ends on pipes, fittings, valves, and other components. It specifies bore diameters, wall thickness schedules, end bevel angles, and transition contours at butt-weld joints to ensure that two different components can be welded together without creating stress concentrations or misaligned bores. Compliance with B16.25 is essential for any valve that will be welded into a piping system.
Scope
Covers butt-welding ends for pipes, flanges, fittings, valves, and other components in carbon steel, stainless steel, and alloy steel. Addresses Schedule 10 through Schedule 160 and XXS wall thicknesses. Includes both standard and heavy-wall transition contours.
Applicable Valve Types
All valve types with butt-weld end connections
Ball Valves, Gate Valves, Globe Valves, Check Valves (BW ends)
Applicable Pressure Classes
Key Requirements — ASME B16.25
Bore diameter must match pipe schedule bore within ±1/32 inch (±0.8 mm)
End bevel angle: 37.5° ± 2.5° for standard wall; compound bevel for heavy-wall
Transition taper: 1:3 taper ratio (18°) for wall thickness mismatch ≤1/8 inch
Root face: 1/16 inch ± 1/32 inch for standard bevel
Heavy-wall transition: three-zone compound bevel for schedules 120, 160, XXS
Material identification marks must be visible after end preparation
Testing Requirements — ASME B16.25
Dimensional verification of bore diameter and bevel angle
Visual inspection of end preparation
Documentation Required for ASME B16.25 Compliance
Dimensional inspection report confirming B16.25 compliance
Material Test Reports (MTR)
Related Standards
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