标 准 号：BS EN 1759-1-2004 简体中文标题：法兰及其连接件.等级标示的管、阀门、配件和附件用环形法兰.NPS 1/2到24 钢法兰 繁体中文标题：法兰及其连接件.等级标示的管、阀门、配件和附件用环形法兰.NPS 1/2到24 钢法兰 English Name：Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, class-designated - Steel flanges, NPS 1/2 to 24...