GB/T 23300-2009 Parallel plane disc gate valves

GB/T 699-1999 Quality carbon structural steels GB/T 700-2006 Carbon structural steels GB/T 1220-2007 Stainless steel bars GB/T 1348-1988 Spheroidal graphite iron castings GB/T 2100-2002 Corrosion-resistant steel castings for general applications GB/T 3280-2007 Cold rolled stainless steel plate, sheet and strip GB/T 13342-2007 Specification for marine reciprocating hydraulic cylinder HG/T 3091-2000 GB/T 191-2000 Packaging—Pictorial marking for handling of goods GB/T 191-2008 Packaging—Pictorial marking for handling of goods GB/T 600-1991 General specifications for marine piping valves and fittings GB/T 600-2008 General specifications for marine piping valves and fittings GB/T 600-2023 General specifications for marine piping valves and fittings GB/T 3032-1989 Marks for marine piping valves and fittings GB/T 3032-2014 Marks for marine piping valves and fittings GB/T 6388-1986 Transport package shipping mark GB/T 17219-1998 Standard for safety evaluation of equipment and protective materials in drinking water system CB/T 3617-1994 Special coating quality requirements for piping systems and their accessories HG/T 3089-2001 Rubber mixture of O-ring seals for fuel HG/T 3093-1988 Rubber seals material for petroleum product supply pipes and fittings GB/T 17219-2025 Hygienic safety evaluation of distribution equipment,protective materials and treatment materials in drinking water system GB/T 191-2025 Graphical symbols marking for handling and storage of packages