Applications
·
Chemical process industry
·
Petrochemical industry
·
For aggressive, highly viscous, crystallising or
hot media
Special Features
·
Flange with a flush welded diaphragm
·
Available for all common standards and nominal
diameters
·
When special materials are selected, all wetted
parts (diaphragm and sealing face) are made of the selected material
Description
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. Thus even
the most difficult measuring requirements can be met by combining measuring
instruments with diaphragm seals.
A fluid inside the system, which can be chosen to suit the
particular application, hydraulically transmits the pressure to the measuring
instrument.
Almost limitless application possibilities exist due to the
large number of available variants, such as 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.
For further technical information on diaphragm seals and
diaphragm seal systems see IN 00.06 "Application, operating principle,
designs"
Due to its design, the model 990.27 diaphragm seal with
flange connection and flush diaphragm is suitable for all currently used
standard flanges and is mounted for pressure measurement in lieu of a blind
flange.
Assembly of the diaphragm seal and measuring instrument is
made via a direct assembly as standard or optionally via a cooling element or a
flexible capillary.
For the material selection WIKA offers a variety of
solutions, in which the upper part and the diaphragm can be made of identical
or different materials. The diaphragm and the sealing face can also be offered
coated or covered with foils.
Measuring systems with model 990.27 WIKA diaphragm seals are
successfully used worldwide in the chemical process and petrochemical
industries with high measuring requirements.