BS 6364
Standard Specification
BS 6364 Gate Valves
What BS 6364 requires for gate valves — applicability, key and testing requirements, the alternative standards, and compliant supply with full certification.
What does BS 6364 require for gate valves?
BS 6364 (BS 6364 - Specification for Valves for Cryogenic Service, British Standards Institution (BSI)) sets the design, material and testing requirements for gate valves in its scope. BS 6364 is the primary cryogenic valve standard, specifying design and testing requirements for valves used in LNG, liquid nitrogen, liquid oxygen, and other cryogenic services below -46°C.
Applicable Pressure Classes
Class 150Class 300Class 600Class 900
Key Requirements
- Extended bonnet design mandatory - bonnet length to maintain packing at ambient temperature
- Body and bonnet materials: A352 LCC (-101°C min), SS316/CF8M (-196°C min)
- Cold-shock test: valve filled with liquid nitrogen, cycled 10 times, then seat leak tested at cryogenic temperature
- Low-temperature impact testing per ASTM A370 - minimum 27J Charpy at -196°C for austenitic SS
- Seat leakage not to exceed Class VI (API 598) when cold-tested
- Venting provision in body to prevent hydraulic lock from vaporising liquid
Testing Requirements
- Cold-shock test at -196°C
- Seat leakage test at cryogenic temperature
- Low-temperature Charpy impact test
Alternative Standards for Gate Valves
Other standards that also govern gate valves — useful for spec cross-acceptance.
API 6DSpecification for Pipeline and Piping ValvesASME B16.34Valves - Flanged, Threaded, and Welding EndAPI 598Valve Inspection and TestingNACE MR0175 / ISO 15156Petroleum and Natural Gas Industries - Materials for Use in H₂S-Containing Environments (Sour Service)ISO 15848Measurement, Test, and Qualification Procedures for Fugitive Emissions - Industrial ValvesBS 6755Testing of Valves - Production Pressure Testing and Fire Type Testing RequirementsAPI 600Specification for Steel Gate Valves - Flanged and Butt-Welding Ends, Bolted and Pressure-Seal BonnetsAPI 602Gate, Globe, and Check Valves for Sizes DN 100 and Smaller for the Petroleum and Natural Gas IndustriesAPI 6FASpecification for Fire Testing of ValvesASME B16.25Buttwelding Ends
Reviewed by Valve Standards Engineering, Vajra Industrial SolutionsDiscipline: Industrial Valve Standards & ComplianceLast reviewed: 20 June 2026
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