本文件规定了用于低温服务的减压阀的设计、制造和试验要求，即用于以下低温流体的减压阀？10？除了在从环境温度到低温的环境温度下操作之外。 本文件适用于尺寸不超过DN？150设计用于释放单相蒸汽或气体。阀可以被指定、构造和测试，使得其适合与多于一种气体或气体混合物一起使用。 笔记？本文件没有提供用于确定特定低温容器的安全阀的容量的方法。ISO？21013-3.

This document specifies the requirements for the design, manufacture and testing of pressure relief valves for cryogenic service, i.e. for operation with cryogenic fluids below？10？°C in addition to operation at ambient temperatures from ambient to cryogenic. This document is applicable to valves not exceeding a size of DN？150 designed to relieve
single-phase vapours or gases. A valve can be specified, constructed and tested such that it is suitable for use with more than one gas or with mixtures of gases. NOTE？This document 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.