Home / Standards / GB/T 597-1983 GB/T 597-1983 Active Marine bronze male thread lift check valves 船用外螺纹青铜止回阀 Standard Type GBT ICS 47.020.30 CCS U52 Status 现行 Issue Date 1983-12-15 Implementation 1984-10-01 Responsible Dept 国家标准委 Drafting Unit N/A