Home / Standards / GB/T 6567.4-1986 GB/T 6567.4-1986 Abolished Graphical symbols for piping systems--Valves and control regulation actuators 管路系统的图形符号 阀门和控制元件 Standard Type GBT ICS N/A CCS J04 Status Abolished Issue Date 1986-06-27 Implementation 1987-05-01 Centralized Committee 国家标准委 Issuing Authority 国家标准委