990.22 990.52 990.53 Diaphragm Seal with Sterile Connection

Almost limitless application possibilities exist due to the large number of available variants. For example: diaphragm seal designs or materials. The type of process connection (flange, threaded and sterile connection) and the basic method of manufacture are important design differentiation criteria.

The model L990.22 diaphragm seals with clamp connection have been specifically developed for use in sterile processes and are integrated into the process by means of a clamp. It ensures a  good cleanability.


  • Food and beverage industry
  • Bio and pharmaceutical industry, production of active ingredients
  • Paint finishing systems

Special Features

  • For cleaning easy to open
  • Quick cleaning of measuring point, without residue
  • Suitable for SIP and CIP
  • 3-A certified
  • Flush, welded diaphragm


Application Datasheet – Fill Out and Return for Most Accurate Quote


Diaphragm seals are used to protect the pressure measuring instrument from aggressive, adhesive, crystallising, corrosive, highly viscous, environmentally hazardous, or toxic media.

A diaphragm made of the appropriate material provides for the separation from the medium to be measured. Even the most difficult measuring requirements can be met by combining measuring instruments with diaphragm seals.

A fluid inside the system that hydraulically transmits the pressure to the measuring instrument can be chosen to suit the particular application.

The diaphragm seal systems can withstand the cleaning vapour temperatures occurring in the SIP processes. This ensures a sterile connection between the medium to be measured and the diaphragm seal.

Assembly of the diaphragm seal and measuring instrument is made via a direct assembly as standard. Optionally this can be done via a cooling element or a flexible capillary.

The upper part and the diaphragm are made of identical materials. Stainless steel 316L (1.4435) is used as standard material. Other special materials are available on request.

Measuring systems with model L990.22 WIKA diaphragm seals are successfully used worldwide in the food, bio, and pharmaceutical industries, as well as in paint finishing systems.