I. Core Standards
ASME B16.34
Scope of application: Valves with flanged, threaded and welded connections (including check valves, gate valves, ball valves, etc.), specifying design, material, manufacturing and testing requirements.
Key contents:
Pressure-temperature rating (PN/Class);
Valve body minimum wall thickness calculation;
Material selection specifications (e.g., carbon steel, stainless steel, alloy steel).
ASME B16.34a
Supplementary Note: For the revision and expansion of B16.34, refine the welding end of the valve connection size and tolerance requirements.
Second, supporting standards
ASME B16.5
Function: Standardise the size, sealing surface form and pressure level of valve flange connection to ensure compatibility with piping systems.
Coverage type: including Class 150 to Class 2500 flange connection valves.
ASME B16.10
Role: Define the length of the structure of the valve (end face spacing), unify the installation interface of different manufacturers of products.
Third, the inspection and test standards
ASME B16.34 test requirements:
Shell strength test: 1.5 times the nominal pressure;
Seal test: 1.1 times the nominal pressure (airtightness or hydraulic test).
API 598 (reference application)
Supplementary note: Although the API standard, but often used in conjunction with ASME B16.34 to clarify the leakage of the valve, the test process.
Fourth, the field of application
Petrochemical: gate and globe valves for high pressure pipelines need to meet the Class 600/Class 900 rating of ASME B16.34;
Power and energy: high-temperature and high-pressure steam system valves need to meet the B16.34 material temperature resistance requirements (such as chromium-molybdenum alloy steel).
Summary: ASME valve standards to B16.34 as the core, combined with B16.5 (flange connection). B16.10 (structure length) and other norms, forming a full-flow technical system covering design, manufacturing, inspection, widely used in petroleum, chemical and energy fields.
