Product category:
Seals
News Release from: Freudenberg Simrit LP | Subject: PPS Simmerring
Edited by the Engineeringtalk Editorial
Team on 18 February 2003
Seal performs under pressure
Simrit's special PPS premium pressure seal Simmerring was developed for sealing shafts in aggregates that are characterised by high system pressure.
Simrit's special PPS premium pressure seal Simmerring was developed for sealing shafts in aggregates that are characterised by high system pressure This radial shaft seal remains stable under pressure in dynamic applications up to 10bar and is capable of withstanding pressure peaks up to 30bar
This article was originally published on Engineeringtalk on 19 Mar 2002 at 8.00am (UK)
Related stories
High-pressure seal replaces O-ring and backup
Cover Seal is a one-piece double-acting polyurethane compact seal designed to provide static sealing for rods and pistons in hydraulic or pneumatic systems at operating pressure levels abovve 5MPa.
Complete piston cuts down on parts
According to Freudenberg, the pneumatic complete piston Pneuko M sets new standards in terms of durability and frictional behaviour.
It also has a bursting strength of approximately 100bar.
Together, these factors make it the ideal shaft seal element for hydrostatic drives like hydraulic engines and hydraulic pumps.
Flange bores in housings that are subject to pressure require special sealing solutions.
With conventional pressure seals, an internal pressure of no more than 2bar can lead to considerable signs of wear on both the seal and the shaft.
The PPS Simmerring was developed to ensure that shafts in hydrostatic drives are reliably sealed in applications such as these.
Its patented sealing edge, which was designed especially to withstand high internal pressure, prevents the formation of damaging hollow grooves.
The extremely short, yet flexible, suspended spring-loaded sealing lip can reduce the wear width of the sealing edge to less than 50% of usual wear.
Moreover, the lip's force of pressure increases only slightly as the internal pressure rises.
This minimises friction torque significantly even under high operating pressure and reduces both thermal load and wear to an unprecedented minimum.
These improvements considerably extend service life.
The PPS Simmerring is made of the tried and tested, wear-resistant elastomer material 75 FKM 595.
This means that it can be used at the sealing edge for operating temperatures of up to 160C.
Optional special materials like HNBR are also available for special applications such as those with heavily pulsating internal pressure levels.
The PPS Simmerring requires no backup ring for the sealing edge, even for applications characterised by high operating pressure.
This simplifies assembly and cuts costs.
In addition, nubs on the front face prevent rotary shaft seals that are mounted on top of one another from sticking together, thereby paving the way for the automatic installation of these seals in series production.
• Freudenberg Simrit LP: contact details and other news
• Email this article to a colleague
• Register for the free Engineeringtalk email newsletter
• Engineeringtalk Home Page
Search the Pro-Talk network of sites
