Home / Standards / GB/T 33509-2017 GB/T 33509-2017 Active General specification for mechanical seals 机械密封通用规范 Standard Type GBT ICS 21.140 CCS J22 Status 现行 Issue Date 2017-02-28 Implementation 2017-09-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A