DIN EN 1092-1-2013 法兰及其连接. 按PN标注的管道, 阀门, 配件及附件用圆形法兰. 第1部分: 钢法兰; 德文版本EN 1092-1-2007+A1-2013
Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges; German version EN 1092-1:2007+A1:2013