This standard specifies the type and parameters, dimension and tolerance, material, type selection, surface treatment, identification, marking, and performance and test requirements of flange connections.
This standard is applicable to flange connections with maximum working pressure of 3.5~42MPa and nominal diameter of DN10~DN127 for hydraulic fluid drive and general purpose.
2 Normative references
The following documents for the application of this document are essential. Any dated reference, just dated edition applies to this document. For undated references, the latest edition (including any amendment) applies to this document.
GB/T 70.1 Hexagon socket head cap screws
GB/T 97.1 Plain washers - Product Grade A
GB/T 131 Geometrical product specifications (GPS) - Indication of surface texture in technical product documentation
GB/T 1804-2000 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications
GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs
GB/T 3098.2 Mechanical properties of fasteners - Nuts
GB/T 3141 Industrial liquid lubricants - ISO viscosity classification
GB/T 3452.2-2007 Fluid power systems - O-rings - Part 2: Quality acceptance criteria
GB/T 5783 Hexagon head bolts - Full thread
GB/T 6170 Hexagon Nuts, style 1
GB/T 7631.2 Lubricants, industrial oils and related products (Class l) - classification - Part 2: Family H (hydraulic systems)
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
3 Type and parameters
3.1 Flange connections are classified into two types, i.e., split or integral flange connections and square flange connections, according to the form of flange clamp plate.
a) See Figure 1 for the type of split or integral flange connections and assembly (including bolt).
GB/T 34635-2017 The following standards are cited: