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]
阀门标准 JIS B2005-6-1-2004 Industrial-process control valves. Part 6：Mounting details for attachment of positioners to control valves Section 1：Positioner mounting on linear actuators.pdf [db:摘要]
