Draft Document - Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, Class designated - Part 4: Aluminium alloy flanges; German and English version prEN 1759-4:2021
文件草稿.法兰及其接头.管道、阀门、配件和附件用指定等级的圆形法兰.第4部分:铝合金法兰;德文和英文版本prEN 1759-4:2021