Product category:
Seals
News Release from: Freudenberg Simrit LP | Subject: BDPT Simmerring
Edited by the Engineeringtalk Editorial
Team on 26 March 2002
Seals can be adapted for individual
applications
Freudenberg has succeeded in developing a Simmerring for industrial applications which combines the properties of both PTFE and elastomer materials.
Freudenberg has succeeded in developing a Simmerring for industrial applications which combines the frictional and wear properties of PTFE (for dynamic sealing) and the properties of elastomer materials (for assembly and static sealing) The BDPT Simmerring comprises a PTFE disc which is securely bonded to the stainless steel reinforcement sheet by an elastomer material
This design means that the PTFE seal packing can be flexibly connected to the sheet.
In addition, thanks to its compact form, it allows for smaller installation areas.
The combination of the flexible connection and the selection of special PTFE materials ensure advantageous frictional and wear properties and ensure optimum sealing performance.
BDPT Simmerrings can be used in any application in which rotating shafts pass through a housing wall and in which fluids and gas may not be allowed to seep out of nor dirt get into the housing.
As with the clamped version, the Simmerring's adhesive sheet component guarantees a stable fit in the housing and simplifies assembly.
In addition, an elastomer sealing bead ensures good static sealing in the bore hole seat.
As a result, there is no need to glue the Simmerring into place.
ACM, NBR, HNBR and FKM materials can all be used as a bonding elastomer, thereby ensuring a high level of thermal and chemical resistance.
A dust lip can be attached to the air side of the Simmerring on request.
This keeps dirt particles well away from the sealing lip and, in so doing, minimises the danger of abrasive wear.
The gap between the dust lip and the PTFE lip can also be filled with a special grease on request.
This grease filler acts as an additional barrier against dust and reduces system friction, thereby increasing the service life of dry-running Simmerrings in particular.
Another way of keeping external dirt away from the sealing zone is by using a non woven disc on the air side.
When required, this is glued into place in an area which has been especially created for this purpose.
The combination of the non woven material's special properties and a design with low shaft cover results in very little additional friction.
The BDPT Simmerring has less friction torque than a conventional Simmerring with an elastomer sealing lip.
As a result of its short sealing lip, the surface on which pressure is exerted is small and the friction torque increases at a slower rate when pressure is increased when compared with an elastomer Simmerring.
This means that this Simmerring is particularly suitable for applications characterised by high speeds and those in which dirt readily occurs and frictional loss should be avoided.
The low friction torque means that the BDPT Simmerring can be used in depressurised states at sliding speeds of up to 30m/s.
The sealing lip can be manufactured using various special compounds.
Consequently, the seal can be adapted to suit each individual application.
This means that sealing materials are also available for a broad range of applications, eg for use with foodstuffs and to meet special requirements regarding wear properties.
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