GB/T 12236-1989 General purpose industrial valves—Steel swing check valves

GB/T 12236-2008 Steel swing check valve for petroleum,petrochemical and allied industries

GB 150-1998 Steel pressure vessels GB/Z 150-2025 Guide for magnetizing behaviour of permanent magnets GB/T 150.1-2011 Pressure vessels—Part 1:General requirements GB/T 150.1-2024 Pressure vessels—Part 1:General requirements GB/T 150.2-2011 Pressure vessels—Part 2:Materials GB/T 150.2-2024 Pressure vessels—Part 2:Materials GB/T 150.3-2011 Pressure vessels—Part 3:Design GB/T 150.3-2024 Pressure vessels—Part 3:Design GB/T 150.4-2011 Pressure vessels—Part 4:Fabrication,inspection and testing,and acceptance GB/T 150.4-2024 Pressure vessels—Part 4:Fabrication,inspection and testing,and acceptance GB 152.1~152.4 GB/T 152.2-2014 Fasteners—Countersinks for countersunk head screws GB/T 152.3-1988 Fasteners--Counterbores for hexagon socket head screws and slotted cheese head screws GB 152.1~152.4 GB/T 196-2003 General purpose metric screw threads—Basic dimensions GB/T 196-2025 General purpose metric screw threads—Basic dimensions GB/T 197-2003 General purpose metric screw threads—Tolerances GB/T 197-2018 General purpose metric screw threads—Tolerances GB/T 897-1988 Double end studs--bm=1d GB/T 898-1988 Double end studs--bm=1.25d GB 901 GB/T 6175-2000 Hexagon nuts,style 2 GB/T 6175-2016 Hexagon nuts,style 2 GB/T 9112-2000 Types and parameters for steel pipe flanges GB/T 9112-2010 Types and parameters for steel pipe flanges GB/T 9113.1-2000 Integral steel pipe flanges with flat face or raised face GB/T 9113.2-2000 Integral steel pipe flanges with male and female face GB/T 9113.3-2000 Integral steel pipe flanges with tongue and groove face GB/T 9113.4-2000 Integral steel pipe flanges with ring-joint face GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB 9113.1~9113.26 GB/T 12220-1989 General purpose industrial valves—Marking GB/T 12220-2015 Industrial valves—Marking GB/T 12221-1989 Metal valves for use in flanged pipe systems—Face-to -face and centre-to-face dimensions GB/T 12221-2005 Metal valves—Face to face,end to end,center to face and center to end dimensions GB/T 12221-2025 Metal valves—Face to face,end to end,centre to face and centre to end dimensions GB/T 12224-1989 General requirements for industrial steel valves GB/T 12224-2005 General requirements for industrial steel valves GB/T 12224-2015 General requirements for industrial steel valves GB/T 12228-1989 General purpose industrial valves—Specification of carbon steel forgings GB/T 12228-2006 General purpose industrial valves—Specification of carbon steel forgings GB/T 12228-2025 General purpose industrial valves—Technical specification for carbon steel forgings GB/T 12229-1989 General purpose industrial valves—Specification of carbon steel castings GB/T 12229-2005 General purpose industrial valves—Specification of carbon steel castings GB/T 12229-2025 General purpose industrial valves—Technical specification for carbon steel castings GB/T 12230-1989 General purpose industrial valves—Specification of austenitic steel castings GB/T 12230-2005 General purpose industrial valves—Specification of stainless steel castings GB/T 12230-2023 General purpose industrial valves—Specification of stainless steel castings GB/T 12252 ZB J 16 006