Model 990.29

Flanged Process Connection, Diaphragm Seals

Flange-Type Seals with Extended Diaphragm

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  • Chemical process industry
  • Petrochemical industry
  • Suitable for corrosive, highly viscous, crystallising or hot pressure media
  • For thick-walled or isolated tanks and pipelines

Special Features

  • Flange with an extended welded diaphragm with contoured diaphragm bed
  • Available for all standard dimensions and nominal diameters
  • With special materials all wetted parts of the selected material


Process connection
Flanges DN 50, 80, 100, 125 following EN 1092-1, sealing face form B1 or NPS 2", 3", 4", 5" per ASME B 16.5, RF 125 ... 250 AA

Pressure rating
See table (reverse side)

Suitable pressure ranges
25 mbar and up, depending on diaphragm size and process conditions

Material of wetted parts
Stainless steel 316L

Diaphragm extension
50, 100, 150 or 200 mm

Instrument connection
Material stainless steel 316L, axial weld-in connection or adaptor G ½ female per EN 837-1, welded to capillary

Capillary extension
Axial entry capillary of stainless steel 1.4571, welded to body, armoured, armour material stainless steel 1.4301 Standard extensions: 1, 1.6, 2.5, 4, 5, 6, 7, 8 m Minimum curve radius: 30 mm

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