Valve Standards Cross-Reference: ASME, API, ISO, and EN

Multiple international standards govern valve design, testing, and procurement. Understanding how ASME, API, ISO, and EN standards relate to each other helps engineers specify valves correctly for global projects.

ASME Valve Standards

The American Society of Mechanical Engineers publishes standards for pressure-temperature ratings, face-to-face dimensions, and materials used in valves. ASME B16.34 is the primary design standard.

• ASME B16.34: Pressure-temperature ratings and design requirements for flanged and threaded valves

• ASME B16.10: Face-to-face and end-to-end dimensions for ferrous valves

• ASME B16.5: Pipe flange and flanged fitting pressure classes

• ASME Section VIII: Pressure vessel design; relevant to bodies with pressure-retaining features

API Valve Standards

The American Petroleum Institute publishes valve standards specific to the oil and gas industry. API standards address fire testing, sour service, pipeline valves, and wellhead equipment.

• API 600: Bolted bonnet steel gate valves for petroleum industry

• API 602: Compact steel gate valves for refineries

• API 6D: Pipeline and pigging valves

• API 607/6FA: Fire-testing requirements for valves

ISO Valve Standards

The International Organization for Standardization publishes valve standards with global acceptance. ISO standards harmonize with European EN standards in many cases.

• ISO 17292: Metal ball valves for petroleum, petrochemical, and allied industries

• ISO 10434: Bolted bonnet steel gate valves for the petroleum and natural gas industries

• ISO 10497: Fire type-testing requirements

• ISO 5208: Industrial valves; pressure testing of metallic valves

EN Standards and Comparison

European EN standards for valves are published by CEN. Many EN standards are technically aligned with ISO standards. Key differences exist in face-to-face dimensions and pressure designation systems.

• EN 1983: Industrial valves; steel ball valves (aligned with ISO 17292)

• EN 1984: Industrial valves; steel gate valves

• PN vs Class: European PN pressure designations differ from ASME Class

• CE marking: Valves in European pressure equipment service require PED 2014/68/EU compliance