ISO 21013的本部分规定了低温环境下先导式泄压阀的设计、制造和测试要求，即除了在环境温度到低温温度下运行外，还应在低温流体中运行。ISO 21013的本部分仅限于尺寸不超过DN 300的阀门，用于释放单相蒸汽、气体或气体和/或蒸汽混合物。 ISO 21013的本部分未提供确定特定低温容器安全阀容量的方法。ISO 21013-3中提供了此类方法。交叉引用:ISO 21028-2:2018ISO 23208:2017ISO 4126-4:2013ISO 15761EN 12516-3EN 12516-2ISO 21028-1ISO 21010ASME B16。34EN 12516-4ISO 21009-1ISO 6708ISO 21013-3ISO 11114-1ISO 21013-1ISO 11114- 2ISO 20421-1ISO 21029-1:2018包含以下内容:修订，2019年5月

This part of ISO 21013 specifies the requirements for the design, manufacture and testing of pilot operated pressure-relief valves for cryogenic service, i.e. for operation with cryogenic fluids in addition to operation at temperatures from ambient to cryogenic. This part of ISO 21013 is restricted to valves not exceeding a size of DN 300 designed to relieve single phase vapours, gases, or mixtures of gases and/or vapours. This part of ISO 21013 does not provide methods for determining the capacity of relief valve(s) for a particular cryogenic vessel. Such methods are provided in ISO 21013-3.Cross References:ISO 21028-2:2018ISO 23208:2017ISO 4126-4:2013ISO 15761EN 12516-3EN 12516-2ISO 21028-1ISO 21010ASME B16.34EN 12516-4ISO 21009-1ISO 6708ISO 21013-3ISO 11114-1ISO 21013-1ISO 11114-2ISO 20421-1ISO 21029-1:2018Incorporates the following:Amendment, May 2019