GB/T 36523-2018 Compound quick intake and exhaust air valve for water supply pipeline

GB/T 6739-2006 Paints and varnishes—Determination of film hardness by pencil test GB/T 8923.1-2011 Preparation of steel substrates before application of paints and related products—Visual assessment of surface cleanliness—Part 1:Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings GB/T 9286-1998 Paints and varnishes—Cross cut test for films GB/T 196-2003 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 1220-1992 Stainless steel bars GB/T 1220-2007 Stainless steel bars GB/T 3098.1-2000 Mechanical properties of fasteners—Bolts, screws and studs GB/T 3098.1-2010 Mechanical properties of fasteners—Bolts,screws and studs GB/T 3280-1992 Cold rolled stainless steel sheets and plates GB/T 3280-2007 Cold rolled stainless steel plate, sheet and strip GB/T 3280-2015 Cold rolled stainless steel plate, sheet and strip GB/T 7306.2-2000 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads—Part 2:Taper internal and external threads GB/T 12220-1989 General purpose industrial valves—Marking GB/T 12220-2015 Industrial valves—Marking 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 13927-1992 Pressure testing for general purpose valves GB/T 13927-2008 Industrial valves—Pressure testing GB/T 13927-2022 Industrial valves—Pressure testing GB/T 17219-1998 Standard for safety evaluation of equipment and protective materials in drinking water system GB/T 17241.6-1998 Integral cast iron pipe flanges GB/T 17241.6-2008 Integral cast iron flanges GB/T 17241.7-1998 Specifications for cast iron pipe flanges GB/T 21873-2008 Rubber seals—Joint rings for water supply,drainage and sewerage pipelines—Specification for materials GB/T 32808-2016 Valves—Model designation method JB/T 7928-2014 Industrial Valve Supply Requirements JB/T 7928-1999 JBT 7928-1999 General valve Supply requirements GB/T 196-2025 General purpose metric screw threads—Basic dimensions GB/T 17219-2025 Hygienic safety evaluation of distribution equipment,protective materials and treatment materials in drinking water system GB/T 12227-2025 General purpose industrial valves—Technical specification for ductile iron castings GB/T 21873-2025 Rubber seals—Joint rings for water supply,drainage and sewerage pipelines—Specification for materials