本文件仅规定了根据ISO 4126-1、ISO 4126-4和ISO 4126-5，由安全阀或CSPR（受控安全泄压系统）串联组合而成的产品，以及根据ISO 4126-2，安装在阀门上游五个管道直径范围内的爆破片安全装置的要求。它规定了此类产品的设计、应用和标记要求，包括爆破片安全装置、安全阀或CSPR，以及连接管或短管（如适用）。此外，还给出了确定施胶组合中使用的组合流量系数的方法。

This document specifies only the requirements for a product assembled from the in-series combination of safety valves or CSPRS (controlled safety pressure relief systems) according to ISO 4126？1, ISO 4126？4 and ISO 4126？5, and bursting disc safety devices, according to ISO 4126？2, installed upstream of the valve within five pipe diameters of the valve inlet. It specifies the design, application and marking requirements for such products, composed of the bursting disc safety device, a safety valve or CSPRS and, where applicable, a connecting pipe or spool piece. In addition, it gives a method for establishing the combination discharge factor used in sizing combinations.