1 Scope
This standard specifies the term, technical requirements, test methods, inspection rules, appearance, marking and supply requirements for cryogenic emergency shutoff valve (hereinafter referred to as emergency shut-off valve).
This standard is applicable to the gas and liquid with nominal dimension of DN 15 to DN 200, nominal pressure of PN 16 to 63, operating temperature of -196℃ to -29℃ emergency shut-off temperature of 70℃ ± 5℃, and with oxygen, nitrogen, argon, natural gas, ethylene (O2, N2, Ar, CNG, C2H4), etc. as the cryogenic media.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding correction to), or revisions of, any of these publications do not apply. However, the parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition applies.
GB/T 229 Metallic materials - Charpy pendulum impact test method (GB/T 229-2007, ISO 148-1: 2006, MOD)
GB/T 1047 Pipework components-Definition and selection of DN (nominal size) (GB/T 1047-2008, ISO 6708: 1995, MOD)
GB/T 1048 Pipework components-Definition and selection of PN (GB/T 1048-2005, ISO/CD 7268: 1996, MOD)
GB/T 1220 Stainless steel bars
GB/T 1222 Spring steels
GB/T 4240 Stainless steel wires (GB/T 4240-1993, neq JIS G4309: 1988)
GB/T 9113 (all parts) Integral steel pipe flanges
GB/T 12220 Industrial valves - Marking (GB/T 12220-1989, idt ISO 5209: 1977)
