ASME B16.25 Gate Valves
What ASME B16.25 requires for gate valves — applicability, key and testing requirements, the alternative standards, and compliant supply with full certification.
What does ASME B16.25 require for gate valves?
ASME B16.25 (Buttwelding Ends, American Society of Mechanical Engineers (ASME)) sets the design, material and testing requirements for gate valves in its scope. 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.
Applicable Pressure Classes
Key Requirements
- 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
- Dimensional verification of bore diameter and bevel angle
- Visual inspection of end preparation
Alternative Standards for Gate Valves
Other standards that also govern gate valves — useful for spec cross-acceptance.
Related Standards
Connected Engineering
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