ICS23.060.01 J16 GB 中华人民共和国国家标准 GB/T 40079—2021 阀门逸散性试验分类和鉴定程序 Classification system and qualification procedures for fugitive emission typetesting of valves (1S015848-1:2015,Industrial valves—Measurement,test and qualification procedures for fugitive emissionsPart l:Classification system and qualification proceduresfortype testing of valves,MOD) 2021-04-30发布 2021-11-01实施 国家市场监督管理总局 发布 国家标准化管理委员会