Radial Shaft Seals

High and Medium Pressure Radial Shaft Seals

World-ClassManufacturingSimrit standard and customradial shaft seals are produced in the world-classmanufacturing plants of TheFreudenberg and NOKGroup. By using our proprietary compounds, specialized designs, consistent manufacturingprocesses and Six-Sigmaquality standards, we canassure our customers of themost robust and reliableproducts available in the market.

Increased SealLongevityTypical radial shaft seals (i.e. TC design) can functionunder pressures up to 5 psi.When operating pressuresexceed this level, seal lifebecomes dramaticallyreduced due to the addedfriction and heat, unless theseal is designed to accommodate this high pressure condition.

Our standard line of TCV,BABSL and TCN, mediumand high pressure seals havea proven track record in avariety of pressure andspeed applications.

The Right Seal

PRESSURE

SEAL LIFE

SHAFTSPEED

The upper pressure limit of any sealdesign is primarily dependent onthree key related variables:

Pressure

Shaft Speed

Expected Seal Life

150

125

100

75

50

25

0

Pressure (psi)

Additional variables that affect seal performance:

Surge pressure, peak duration and frequency

Fluid viscosity and lubricity

Fluid temperature and shaft surface

00 5 10 15 20 25 30 35

TCN

TCVBABSL

TC NO PRESSUREDESIGN

Shaft Speed (ft/sec)

Seal Performance

Better Sealing LipThese seals are designed witha spring-loaded lip, reinforcedmetal case and a short flexsection. Along with a definedlip geometry and proprietarymaterials, this ensures that thesealing lip does not lift or rollin high pressure applications.

In pressure seals, the main lipcontact pressure distributionis shifted towards the air sidedue to lip deformation andspring position. The increasedcontact band with the shaftincreases friction, heat generation and wear.

FLUIDSIDE

AIRSIDE

FluidPressure

Normal

Pressure Loaded

0 1 2 3 4 5 6

1600

1400

1200

1000

800

600

400

200

0PRES

SURE

(psi

)

SPEED (rpm x 1,000)

Low Speed Designs

High Speed Designs

Standard Oil Seal (i.e. TC)

Shaft speed has a directeffect on pressure:

SurfaceCondition,Finish andInstallationProcedures

Quality Tolerances

and Fit

PressureLubricantTemperature

EccentricitySurface SpeedContamination

Striking a delicate balance

PRESSURE SEALSSeal must resist lip deformation to minimize friction, wear and heat.Seal material should have high mechanical strength to prevent seal extrusion.Shaft speed relates to pressure (as illustrated below).

SEALDESIGN

Run-off to suction chamber

Compressed oilGrease filling

Return oil flow

North American Headquarters47690 East Anchor CourtPlymouth, MI 48170

Tel.: (866) 2-SIMRITFax: (734) 354-5500

Fluid Power Business Unit3600 West MilwaukeeSpencer, IA 51301

Tel.: (712) 262-4867Fax: (712) 262-8160

O-Ring Business Unit25151 Arctic Ocean DriveLake Forest, CA 92630

Tel.: (949) 598-8155Fax: (949) 598-8151

Radial Shaft Seal Business Unit11617 State Route 13Milan, OH 44846

Tel.: (419) 499-2502Fax: (419) 499-6111 www.simrit.com

Simrit is the industrial sealing products division of

Freudenberg-NOK that is dedicated to serving industrial

distributors and OEMs. Simrit products are manufactured

within the Freudenberg and NOK Group Companies,

known for their world-class quality and reliability.

Simrits manufacturing and design expertise, coupled

with exceptional customer service and field engineering

support, enables us to provide our customers superior

sealing components and total system sealing solutions

that exceed their expectations.

SimritYour Technology Specialist.

Who is Simrit?

0302HP5M