Home / Standards / GB/T 34028-2017 GB/T 34028-2017 Active Valve stem reciprocating seals of engine and performance test method 发动机气门导杆往复油封及性能试验方法 Standard Type GBT ICS 83.140.50 CCS G43 Status 现行 Issue Date 2017-07-12 Implementation 2018-02-01 Responsible Dept 中国石油和化学工业联合会 Drafting Unit N/A