Iso 7-1
在螺纹上形成压力密封连接的管螺纹 — 第1部分:尺寸、公差和标记
Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and designation
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Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and designation
Ductile iron pipes, fittings, accessories and their joints for gas pipelines - Requirements and test methods
Butt welding fittings; elbows; reduced correlation of utilization