Valve Standard Reference
ASME B16.34
AmericanValves - Flanged, Threaded, and Welding End
ASME B16.
What is ASME B16.34?
ASME B16.34 (Valves - Flanged, Threaded, and Welding End) is an industrial valve standard issued by American Society of Mechanical Engineers (ASME). Covers all valve types (gate, globe, ball, check, butterfly, plug) with flanged, threaded, or weld-end connections.
- Issuing Body:
- American Society of Mechanical Engineers (ASME)
- Category:
- design
Overview - ASME B16.34
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.
Scope
Covers all valve types (gate, globe, ball, check, butterfly, plug) with flanged, threaded, or weld-end connections. Pressure classes 150 to 4500. Material Groups 1.1 through 3.4. Applies to valves with ASME, DIN, JIS, and other flange standards when rated to B16.34 pressure-temperature tables.
Vajra Industrial Solutions manufactures and supplies valves engineered to comply with ASME B16.34, each delivered with ASME B16.34 conformance statement on valve data sheet and Material Test Reports (MTRs) for pressure-containing parts as standard.
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Applicable Valve Types
All valve types: gate, globe, check, ball, butterfly, plug, diaphragm, and specialty valves
Applicable Pressure Classes
Key Requirements - ASME B16.34
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 - ASME B16.34
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
Documentation Required for ASME B16.34 Compliance
ASME B16.34 conformance statement on valve data sheet
Material Test Reports (MTRs) for pressure-containing parts
Hydrostatic test certificate
Pressure-temperature rating certificate or data sheet referencing B16.34 tables
Related Standards
Browse ASME B16.34 Compliant Valves
Technical Articles Referencing ASME B16.34
Ball Valve vs Gate Valve: Technical Comparison for Industrial Applications
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How to Select the Right Industrial Valve: A Step-by-Step Engineering Guide
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ASME B16.34 Pressure-Temperature Ratings for Industrial Valves: Explained
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Globe Valve vs Gate Valve: Flow Control Versus Isolation Explained
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All Standards
ASME B16.34 by Valve Type
Engineering references
Connected Engineering
Need ASME B16.34 Compliant Valves?
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