GB/T 20063.8-2006

This standard specifies graphical symbols for representing valves and dampers in schematic diagrams, such as those used in piping and instrumentation diagrams (P&IDs) for process engineering, fluid power systems, and HVAC design. It is applied in technical documentation, engineering drawings, and system schematics across industries like chemical processing, water treatment, and manufacturing to ensure consistent, unambiguous communication of component functions. The symbols cover various types including control valves, check valves, and dampers, facilitating design, procurement, and maintenance activities.