Design Specifications: GB/T 12237 ("General-purpose valves-Steel ball valves for flanged and butt-welding connections") specifies requirements for valve structure, materials, and performance.
Face-to-Face Dimensions: GB/T 12221 defines the dimensions of valve components and installation spacing.
Connection Flanges: Standards such as GB/T 9113 and JB/T 79 regulate flange dimensions, sealing surface types, and bolt preload to ensure compatibility with piping systems.
Testing and Inspection: GB/T 13927 ("Industrial valves-Pressure testing") covers shell tests, seat tests, and other procedures to verify valve strength and sealing integrity.
General Requirements: GB/T 12224 ("Steel valves-General requirements") specifies general technical conditions regarding materials, machining precision, and surface treatment.
