KSB Centrifugal Pump Lexicon –

From A to Z

Flange type

Flange types may vary significantly depending on the application. The faces of flanges used with non-positively seated sealing elements are flat or of a raised face, spigot and recess or tongue and groove design. A further variant is the O-ring recess and O-ring groove face type.

In the case of positively seated sealing elements, there is a choice of flanges for diaphragm-weld packings to DIN 2695 with chamfer or a smaller raised face diameter and lens-shaped gaskets to DIN 2696 with machined recess.

The different sealing element types, dimensions, design features and materials are not covered by the European standard EN 1092 (see Flange standard). 

The sealing element dimensions are specified in the EN 1514 standard series. See Fig.1 Flange type

Flange types classified by application

  • Plate flange for soldering or welding
  • Loose plate flange
  • Blind flange
  • Welding neck flange
  • Hubbed slip-on flange for welding
  • Threaded flange
  • Integrally cast flange (flange forming an integral part of a casing or fitting)
  • Hubbed socket weld insert flange

  

  

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