GB/T 46630-2025 Active

This document specifies the technical requirements, testing and inspection, marking, and sealing for spring-loaded direct-loading safety valves (hereinafter referred to as "safety valves") used in cryogenic containers.
This document applies to safety valves used to discharge cryogenic gas media under operating conditions where the nominal size does not exceed DN150, the medium temperature is below -10 °C, and the operating temperature ranges from the medium temperature to the ambient temperature. After being designed, manufactured, and verified through testing, safety valves can be applied to various single-phase gases or gas mixtures.
Note: This document does not provide a calculation method for determining the discharge volume of safety valves for specific cryogenic containers. For related calculation methods, please refer to ISO 21013-3.