阀门标准 MSS SP-85-2002 法兰端和螺纹端灰铸铁截止阀和角阀 GRAY IRON GLOBE &ANGLE VALVES FLANGED AND THREADED ENDS.pdf [db:摘要]
阀门标准 BS EN 558-2-1996 Industrial valves — Face-to-face and centre-to-face dimensions of metal.pdf [db:摘要]
