Home / Standards / GB/T 23300-2009 GB/T 23300-2009 Active Parallel plane disc gate valves 平板闸阀 Standard Type GBT ICS 47.020.30 CCS U53 Status 现行 Issue Date 2009-03-09 Implementation 2009-11-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委