Safety devices for protection against excessive pressure 超压保护安全装置
国际标准化组织（ISO）发布的通用要求标准，旨在全球范围内统一超压保护安全装置的性能、测试和认证要求。非强制性，但被欧盟（PED指令）、澳大利亚（各州WHS法规）等多国法规引用为合规路径，具有事实上的强制效力。
共有10个分册 ISO 4126-1 Safety valves 安全阀 (最核心也是最常用的分册) ISO 4126-2 Bursting disc safety devices 爆破片 ISO 4126-3 Safety valves and bursting disc safety devices in combination ISO 4126-4 Pilot-operated safety valves ISO 4126-5 Controlled safety pressure relief systems ISO 4126-6 Application, selection and installation of bursting disc safety devices ISO 4126-7 Common Data ISO 4126-8 ISO 4126-9 Application and installation of safety devices excluding stand-alone bursting disc safety devices ISO 4126-10 Sizing of safety valves and bursting discs for gas/liquid two-phase flow
对应/相关国际标准
欧标体系 EN ISO 4126, 转化