Product category:
Seals
News Release from: Freudenberg Simrit LP | Subject: PTS radial shaft seal
Edited by the Engineeringtalk Editorial
Team on 06 May 2005
Radial shaft seal has a modular
structure
With the new PTS radial shaft seal, Simrit has succeeded in combining the fascinating advantages of PTFE with the functional properties of elastomer.
Simrit's brand new PTS radial shaft seal has a modular structure Thanks to variations in the PTFE or elastomer material used, the steel or stainless steel carrier parts, the possibility of integrating an excluder lip, and a variety of PTFE sealing lip designs, many aggregates can be sealed in a much more reliable and, therefore, much more economical way
This article was originally published on Engineeringtalk on 18 Feb 2003 at 8.00am (UK)
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In some cases, completely new solutions are possible.
Depending on the operational requirements, recently developed, highly wear-resistant, low-friction PTFE compounds are used.
In short, the PTS radial shaft seal is Simrit's answer to the ever-increasing demands of mechanical engineering, especially because it can be used in an incredibly broad range of applications.
Radial shaft seals are tried and trusted machine elements that seal reliably in the most varied flange bores for thousands of operating hours.
When combined with the ever-increasing power density of aggregates, new synthetic lubricants with a high proportion of aggressive additives, or lubricants with poor lubricating properties can impair the sealing properties of an elastomer seal.
Further reading
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According to Freudenberg, the pneumatic complete piston Pneuko M sets new standards in terms of durability and frictional behaviour.
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Freudenberg has succeeded in developing a Simmerring for industrial applications which combines the properties of both PTFE and elastomer materials.
Vibro-acoustic fine-tuning for heavy machinery
Optimising heavy machinery in terms of vibration control and acoustics is a particularly difficult technical challenge.
The only way to meet all of these requirements is to use PTFE seals.
The unique properties of PTFE, such as its outstanding resistance to both high and low temperatures (from -60 to +260C) and its resistance to almost all media, make this material indispensable in the field of sealing technology.
A spiral-like return groove (return helix) in the sealing edge is used to optimise the sealing properties of PTFE radial shaft seals.
Such PTFE radial shaft seals have over the years proven highly successful for sealing crankshafts.
However, the material-specific properties of PTFE do have some disadvantages in certain operating conditions (eg applications characterised by high pressure or changing shaft rotation directions).
With the new PTS radial shaft seal, Simrit has succeeded in combining the fascinating advantages of PTFE with the functional properties of elastomer.
This means that Simrit is now in a position to supply its customers with a radial shaft seal that guarantees outstanding variability in terms of the various requirements it must meet.
The PTFE seal packing in the PTS radial shaft seal is bonded to the elastomer.
In conjunction with its partially rubberised carrier housing, the PTS radial shaft seal guarantees: all the functional advantages of PTFE for the sealing edge; reliable static sealing even under pressurisation up to at least 10bar; and that there is no need to glue the seal into the housing because of the rubberisation of the sealing base.
An integral elastomer excluder lip prevents dirt from reaching the actual sealing lip.
This means that two seals can often be replaced by one.
Moreover, new highly wear-resistant, low-friction PTFE compounds have been designed and extensively tested for use in the food processing industry.
PTFE seals without return structures are generally used in conjunction with changing shaft rotation directions.
When compared with standard PTFE seals, the new PTS radial shaft seal cuts leakage rates by a factor of 14.
In applications with very high imperviousness requirements, a PTS radial shaft seal with bidirectional helix is also available.
At pressure levels up to 0.3bar, this seal reduced leakage rates by a factor of 100 when compared with conventional seals.
Simrit offers its customers both PTS radial shaft seals and radial shaft seals with return grooves for applications with a defined direction of rotation.
They can be used to reliably seal shafts in hydrostatic drives with pressure levels of up to at least 6bar at at least 6.3m/s.
Thanks to the modular structure of the new PTS radial shaft seal, the use of various PTFEs, elastomer materials and carrier parts, the integration of an excluder lip, and a variety of PTFE sealing lip designs, many aggregates can be sealed in a much more reliable and, therefore, much more economical way.
In some cases, completely new solutions are possible.
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