Flanged Diaphragm Seals

The BF construction has a seal body that is made of a (forged) blind flange. The weld of the diaphragm to the seal body is a wetted part and therefore diaphragm materials are mostly chosen the same as the flange material. The BF is typically used in combination with (differential) pressure transmitters for applications such as level, flow  and (absolute) pressure measurement.

The BRF type is a flanged construction with the diaphragm flush in the process. The seal body is made of a blind flange and this design has the diaphragm sheet material covering the complete wetted parts. This design is typically used as a cost effective design with full wetted parts in exotic material compared to a full body in exotic material. BRF is typically used in combination with (differential) pressure transmitters for applications such as level, flow and (absolute) pressure measurement.

The BC construction has a seal body that is made of bar stock or forged material. The weld of the diaphragm to the seal body is a
wetted part and therefore diaphragm materials are mostly chosen the same as the flange material. Its pressure rating is defined by the cover flange and as such it can be used for all pressure ratings in all facings.

The BRC construction has a seal body that is made of bar stock or forged material and is designed to obtain a diaphragm seal with full wetted parts in exotic materials. With Badotherm unique resistance weld technology, a stainless steel body (non-wetted) has its wetted parts (diaphragm and raised face area) covered by sheet material in the required exotic material. This is more economic than producing the full body in exotic material. BRC is typically used in combination with (differential) pressure transmitters for applications such as level, flow and (absolute) pressure measurement.

The EXT construction has a seal body that is made of a (forged) blind flange. The weld of the diaphragm to the seal body is a wetted part and therefore diaphragm materials are mostly chosen the same as the flange material. The EXT is typically used in combination with (differential) pressure transmitters for applications such as level, flow and (absolute) pressure measurement.

The EXT-BC construction has a seal body that is made of bar stock or forged material. The weld between the seal body and the
diaphragm is a wetted part and therefore diaphragm materials are mostly chosen the same as the body material. The EXT-BC is
recommended when special body or flange material grades are required. EXT-BC is typically used in combination with (differential) pressure transmitters for applications such as level, flow and (absolute) pressure measurement.

The EXT-UREA construction has a seal body that is made of a (forged) blind flange in combination with a welded extension made from bar stock. The EXT-UREA is a typical design according Snamprogetti^® specification TB.5002.

The US-F construction is designed for those applications where the existing process connection is too small to use a flush mounted diaphragm seal mainly because of a too small diaphragm. The US-F consists of an upper and lower housing. The lower housing creates the transition from the diaphragm size to the actual small process connection.

The USL-F construction is designed for those applications where the existing process connection is too small to use a flush diaphragm seal. The USL-F consists of an upper and lower housing, the upper is the actual seal part with a diaphragm size that allows for measurement of low ranges. The lower housing creates the transition from the diaphragm size to the smaller process connection.

The US-FH construction is designed for those applications where the existing process connection is too small to use a flush mounted diaphragm seal mainly because of a too small diaphragm. The USFH consists of an upper and lower housing. The lower housing creates the transition from the diaphragm size to the actual small process connection.

The USL-FH construction is designed for those applications where the existing process connection is too small to use a flush diaphragm seal. With the FH construction the tapped holes of the lower part are avoided and through holes are provided so a stud bolt and nut construction is possible. Secondary effect is a cooling effect in cases of higher process temperatures. The USL-FH consists of an upper and lower housing, the upper is the actual seal part with a diaphragm size that allows for measurement of low ranges. The lower housing creates the transition from the diaphragm size to the smaller process connection.

The USM-F construction is designed for those applications where the existing process connection is too small to use a flush diaphragm seal. The USM-F consists of an upper and lower  housing, the upper is the actual seal part with a diaphragm size that allows for measurement of low ranges. The lower housing creates the transition from the diaphragm size to the smaller process connection.

The HTDS construction is designed for those applications where the process temperature exceeds the limits of the BSO fill fluids. The patented design can withstand temperatures up to 600°C. All materials used in this design are carefully selected to have maximum performance under these extreme temperatures.

Badotherm P-seal is mainly used in the pulp and paper industry. The seal can handle highly viscous media with particles in the media. These kind of situations are found in the pulp production and paper processing. Unique part of this design is the rotating retainer flange.

The FSO-BF construction has a seal body that is made of bar stock or forged material. The weld between the seal body and the diaphragm is a wetted part and therefore diaphragm materials are mostly chosen the same as the body material. The FSO-BF is recommended when special body or flange material grades are required. FSO-BF is typically used in combination with (differential) pressure transmitters for applications such as level, flow and
(absolute) pressure measurement.

The FSO-BRF construction is designed to obtain a diaphragm seal with full wetted parts in exotic materials. With Badotherm’s unique resistance weld technology, a stainless steel body (non-wetted) has its wetted parts (diaphragm and raised face portion) covered by sheet material in the required exotic material. This is far more economic than producing the full flange in exotic material. FSO-BRF is typically used in combination with (differential) pressure transmitters for applications such as level, flow and (absolute) pressure measurement.

The FSO US-F construction is designed for those applications where the existing process connection is too small to use a flush diaphragm seal. The FSO US-F is a variant on the standard US-F and is using 3 instead of 2 components. The assembly consist out of an upper and lower housing. The upper part is retained by a cover flange made from a blind flange. This blind flange can be connected to the process flange by standard stud bolts. Because of interference of certain dimensions the executions are limited.

The FSO USL-F construction is designed for those applications where the existing process connection is too small to use a flush
diaphragm seal. The FSO USL-F is a variant on the standard USL-F and is using 3 instead of 2 components. The assembly consist out of an upper and lower housing. The upper part is retained by a cover flange made from a blind flange. This blind flange can be connected to the process flange by standard stud bolts. Because of interference of certain dimensions the executions are limited.

The FSO-EXT construction has a seal body that is made of bar stock or forged material. The weld between the seal body and the
diaphragm is a wetted part and therefore diaphragm materials are mostly chosen the same as the body material. The FSO-EXT is
recommended when special body or flange material grades are required. FSO-EXT is typically used in combination with (differential) pressure transmitters for applications such as level, flow and (absolute) pressure measurement.

The FSO-EXT lens type seal has a screwed connection into the flange. The seal body is made of bar stock or forged material. Its pressure rating is defined by the back-up flange and as such it can be used for pressure ratings determined by the licensor. This design is often used in UREA and fertilizer industry.

SJ is typically used in combination with pressure transmitters for pressure measurement, in those applications where the diaphragm need to be flush with the pipe wall. This can be obtained by either mounting the SJ seal part in a saddle type that is welded on top of the piping or in a flow through block that can be welded into the piping or mounted by means of flanges. Typical applications are pressure and flow measurements of highly viscous media