990.29 Diaphragm Seal with Flange Connection


  • Aggressive, highly viscous, crystallising or hot media
  • Process industry
  • Thick-walled or insulated pipelines and vessels

Special Features

  • Flange with extended welded diaphragm
  • Common standards and nominal widths available
  • When special materials are selected, all wetted parts are made of the selected material
  • Robust, all welded design


Application Datasheet – Fill Out and Return for Most Accurate Quote


Diaphragm seals are used for the protection of pressure measuring instruments in applications with difficult media. The diaphragm of the diaphragm seal effects the separation of the instrument and the medium.
The pressure is transmitted to the measuring instrument via the system fill fluid which is inside the diaphragm seal system.

There are a wide variety of designs, materials, and system fill fluids available for even the most demanding applications.

The model 990.29 diaphragm seal is available in place of a blind flange for all commonly used standard flanges. The diaphragm seal can be used at thick-walled or insulated locations in pipeline and vessel construction due to extended diaphgram.

Assembly of the diaphragm seal to the measuring instrument may be made via a direct connection, for high temperatures via a cooling element, or via a flexible capillary.

The extended diaphragm and the wetted parts can be made of identical or different materials. The diaphragm and the extended diaphragm can be coated.