Draft Document - Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 3: Copper alloy flanges; German and English version prEN 1092-3:2021
文件草稿.法兰及其接头.管道、阀门、配件和附件用圆形法兰 PN指定.第3部分:铜合金法兰;德语和英语版本prEN 1092-3:2021