ASME B16.34 Globe Valves
What ASME B16.34 requires for globe valves — applicability, key and testing requirements, the alternative standards, and compliant supply with full certification.
What does ASME B16.34 require for globe valves?
ASME B16.34 (Valves - Flanged, Threaded, and Welding End, American Society of Mechanical Engineers (ASME)) sets the design, material and testing requirements for globe valves in its scope. ASME B16.34 is the foundational pressure-temperature rating standard for industrial valves. It defines the maximum allowable working pressure (MAWP) for valves at any given temperature, based on valve pressure class (150 to 4500) and body material group. Almost every industrial valve purchased globally references ASME B16.34 - it is the starting point for pressure-temperature compliance of any process valve.
Applicable Pressure Classes
Key Requirements
- Minimum wall thickness of body and bonnet based on pressure class and material group
- Pressure-temperature (P-T) rating tables: every combination of class and material has a defined MAWP at each temperature
- End-to-end dimensional requirements for flanged, threaded, and weld-end valves
- Weld-end bevel dimensions per ASME B16.25
- Material compliance: each material assigned to a Group (1.1, 1.2, 1.3, 1.13, 2.1, 2.2, 3.1, 3.2, etc.) with separate P-T tables
- Examination requirements: mandatory hydrostatic and leakage testing per B16.34 Table 5
- Marking requirements: stamping with class, material, pressure, and body markings
Testing Requirements
- Shell/body hydrostatic test: 1.5× rated pressure at 20°C
- Seat/closure test: 1.1× rated pressure
- Backseat test (where applicable)
- Shell test duration proportional to NPS
Alternative Standards for Globe Valves
Other standards that also govern globe valves — useful for spec cross-acceptance.
Related Standards
Connected Engineering
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