压水堆核电厂一回路系统大口径电弧焊接不锈钢卷制钢管及管件技术条件
Specification for primary system arc-welded stainless steel larger size pipes and fittings for pressurized water reactor nuclear power
1998-12-30
ISO 18984-2025
Ball valves for thermoplastics piping systems for hot and cold water installations under pressure — Types, dimensions and requirements
压力下冷热水装置用热塑性塑料管道系统用球阀 类型、尺寸和要求