标 准 号：BS EN 1092-2-1997 简体中文标题：法兰及其连接.按PN标注的管、阀门、管接头和附件的圆形安装法兰.第2部分:铸铁法兰 繁体中文标题：法兰及其连接.按PN标注的管、阀门、管接头和附件的圆形安装法兰.第2部分:铸铁法兰 English Name：Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Cast iron flanges...