阀门标准 BS EN 12569-1999 工业阀门.化学和岩石化学工艺工业阀门.要求和试验Industrial valves – Valves for chemical and petrochemical process industry – Requirements and tests.pdf [db:摘要]
阀门标准 BS EN 12351-1999 工业阀门 带法兰连接的阀门保护帽Industrial valves. Protective caps for valves with flanged connections .pdf [db:摘要]
