This standard specifies the terms and definitions, models and structural types, technical requirements, test methods, inspection rules, marking, packaging, storage and transportation of water supply pipeline inlet and exhaust valves. This standard applies to trace intake and exhaust valves with nominal sizes DN15~DN25 and nominal pressure not greater than PN25, as well as rapid intake and exhaust valves and combined rapid intake and exhaust valves with nominal sizes DN25~DN300 and nominal pressure not greater than PN25. Medium The water temperature is 0℃~65℃.
GB/T 17241.7 Specifications for cast iron pipe flanges
GB/T 196 General purpose metric screw threads--Basic dimensions
GB/T 197 General purpose metric screw threads—Tolerances*， 2018-03-15 Update
GB/T 21873 Rubber seals.Joint rings for water supply,drainage and sewerage pipelines.Specification for materials
GB/T 228.1 Metallic materials—Tensile testing—Part 1: Method of test at room temperature*， 2021-12-31 Update
GB/T 3098.1 Mechanical properties of fasteners.Blots, screws and studs
GB/T 3280 Cold rolled stainless steel plate, sheet and strip
GB/T 6739-2006 Paints and varnishes-Determination of film hardness by pencil test
GB/T 7306.2 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 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 coa
GB/T 9286-1998 Paints and varnishes--Cross cut test for films