GB/T 12238-1989 General purpose industrial valves—Flanged and wafer butterfly valves

GB/T 12238-2008 Flanged and wafer resilient seal butterfly valves

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/T 1184-1996 Geometrical tolerancing—Geometrical tolerance for features without individual tolerance indications GB/T 1220-1992 Stainless steel bars GB/T 1220-2007 Stainless steel bars GB 4216.1~4216.4 GB 4216.1~4216.4 GB 4216.1~4216.4 GB 4216.1~4216.4 GB 4424 GB 4981 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 12223-2005 Part-turn valve actuator attachments GB/T 12223-2023 Part-turn valve actuator attachments 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 12225-1989 General purpose industrial valves—Specification of copper alloy castings GB/T 12225-2005 General purpose industrial valves—Specification of copper alloy castings GB/T 12225-2018 General purpose industrial valves—Specification of copper alloy castings GB/T 12226-1989 General purpose industrial valves—Specification of flake graphite iron castings GB/T 12226-2005 General purpose industrial valves—Specification of flake graphite iron castings GB/T 12226-2025 General purpose industrial valves—Technical specification for gray iron castings GB/T 12227-1989 General purpose industrial valves—Specification of spheroidal graphite iron castings GB/T 12227-2005 General purpose industrial valves—Specification of spheroidal graphite iron castings GB/T 12227-2025 General purpose industrial valves—Technical specification for ductile iron castings 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 12252