2008GB/T 15558.3-2008 Buried polyethylene(PE)piping systems for the supply of gaseous fuels - Part 3: Valves
GB/T 15558.3-2008 Buried polyethylene(PE)piping systems for the supply of gaseous fuels - Part 3: Valves was changed to GB/T 15558.4-2023 Buried polyethylene (PE) piping systems for gas use Part 4: Valves.