Home / Standards / JB/T 7550-1994 JB/T 7550-1994 Abolished 空气分离设备用切换蝶阀 Standard Type JB ICS N/A CCS N/A Status Abolished Issue Date 1994-12-09 Implementation 1995-10-01 Centralized Committee 机械工业部 Issuing Authority 机械工业部