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Lip Selection


Lip Selection

Lip style is directly related to the media type, shaft speed, pressure, temperature and contamination parameters. The media type discussed in the application study was grease versus oil retention. Other types of media include water, food and dairy products. All of these will affect the choice of available styles. Shaft speed, temperature and pressure parameters should all be reviewed in the parameter section to reveal their affect on sealing.

The table below shows common lip styles and their names, applications and descriptions. There are many other available lip styles when trying to accommodate special parameters or extreme environments.

The effectiveness of your radial shaft seal depends on the lip type selection. This is the most important design variable and will determine both the life expectancy and cost.

Application Lip Type Description Example
Oil retention Standard “S” Lip This style of lip is used for standard pressure oil sealing in clean environments.
May be reversed for extreme grease sealing.
 Standard Lip S
Oil retention for medium pressure applications Standard “SN” Lip This style of lip has a shortened flex section to accomodate medium pressures.  Standard SN Lip
Oil retention for dusty applications Standard “T” Lip This style of lip is used for standard pressure oil sealing in dusty / dirty environments.  Standard T Lip
Oil retention for medium pressure applications Standard “TN” Lip This style of lip has a shortened flex section to accomodate medium pressures.  Standard TN Lip
Grease retention applications Standard “V” Lip This style of lip is used for standard pressure grease sealing in clean environments.
May be reversed to purge grease cavity.
 Standard V Lip
Grease retension for dusty applications Standard “K” Lip This style of lip is used for standard pressure grease sealing in dusty / dirty
environments.
 Standard K Lip
Oil retention for applications with low lubrication Standard “X” Lip This style of lip is used for standard pressure sealing of none lubricating fluids.
Inverted dust lip retains grease near sealing lip.
 Standard X Lip
Separating two fluids Standard “D” Lip This style of lip is used for standard pressure separation of two fluid.  Standard D Lip
Grease retention in heavy contamination environment Standand “U” Lip This style of lip is used for standard pressure grease sealing in extreme / heavy
contamination environments. Flexible lips allow for purging of grease cavity from
either direction.
 Standard U Lip
Grease retention in heavy contamination environment Standand “T9” Lip This style of lip is used for standard pressure grease sealing in extreme / heavy
contamination environments. Lip on outside face is designed to act as an axial face
seal.
 Standard T9 Lip
Contamination exclusion Standand “WP” Lip This style of lip is used for scraping and wiping in hydraulic and pnuematic cylinder
applications.
 Standard WP Lip

 

 

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