wlk oil seals

5/19/2018 WLK Oil Seals

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WLK Oil Seals Manualhttp://www.manuallib.com/file/2203357

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CONTENTS Page

1. Certificate 2 - 4

2. Profile 5 - 6

3. Characteristics of W L K Oil Seals 7 - 19

4. Factors Affect Sealing 20 - 23

5. Installation Instructions 24 - 26

6. Materials 27 - 28

7. Inventory List of WLK Oil Seals Appendix



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ISO CERTIFICATE



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ISO / TS16949 CERTIFICATE



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NSF CERTIFICATE

Certification is specific for use as a seal in submersible mechanicalpump or motor.

The maximum inner diameter of the seal is 14 mm, the maximum

outer diameter of the seal is 25.3 mm, and the maximum height of

the seal is 7.2 mm.



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Also Oil Seals for Agricultural Machinery

Cuts down on wear and tear,increasing lubrication efficiency.

Heat-resistant, Cold-resistant, Oil resistant and wont decompose.

Top-efficiency for smoother operation, produced under strict quality

control for best reliability.

Dust lip (Auxiliary lip)

Spring

Main lip(Primary lip)

Metal ring



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"WLK" Oil Seals

Meet Requirements of Varied Application

with more than 40 years of experiences and advanced technics

in making oil seals,W L K has been a mark of reliable.

To meet the requirements of varied sealing applications, a series

researching and developing program had taken to provide

W L Koil seals in consistently high qualities, such as:

Precision dimensions give exactly sealing.

Patient heat resistance.

Good chemical stability.

Long term durability.

By rigid quality control throughout all manufacturing process,

WLK oil seals preform successfully in official test by ASTM

and CNS (Chinese National Standard ) and years after years

practice in vehicles and machines.They meet requirements of

varied applications, they are running over the world.

Fully automatic moulding and finishing process provides mass

production, enable us to reduce the cost largely and ensureprompt delivery. So, the reasonable price and high quality of

WLK oil seals are your best choice.

If you have any other specifications or designs out-listed in this

catalogue are available, our R & D engineers will fullfil your

request.



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Characteristics of WLK Oil Seals

Outside Surface

Front Chamfer

Top Surface

Lining

Flex SectionSurface(Outer)

Garter Spring

Spring Groove

Spring Retaining Lip

Trim Face

Sealing Lip

Sealing Edge Plane

Rubber Covered O.D

Back Chamfer

Back Abutment Face

Metal insert

Insert Locator Pin Hole

Bottom Rubber Covered

Flex Section

Flex Section Surface(lnner)

Spring PlaneMolded Face

Sealing Edge

W L K radial shaft seals are lip contact sealing

components for O.D. pressfit installation.

Consistant radial load on the sealing lip is normally

provided by a garter spring.

The advantage of this design lies in the precisedistance between sealing edge and effectivespring planes i.e.in the R-parameter which actslike a lever arm.

Optimum design of this distance prevents thesealing lip from folding.

It also creates a pressure-favorable distributionunder the sealing edge and thus reduces wear.

The following configurations offer you a seal that meet yourspecific needs: By choosing double or single lip with and

without an inner case, or a seal kit... You get only much asyou need and save your money.

STANDARD DESIGN

Dust Lip Surface(Bottom Side)

Dust Lip

Dust Lip Surface(Flex Section Side)

Shaft Seal With Dust Lip

Lever Arm

Spring PlaneSealing Edge Plne

Inside Outside



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Single lip, rubber covered, spring-loaded.Can accommodate considerable surface roughness and thermal expansion of the housing and will notrust. Required for split housing and when sealing gaseous or low viscosity media.

SC

SC

SB

SA

TC

SB

SA

TC

Single lip, Bare in outer metal case, spring loaded.

Sealing is more difficult with housing bore of considerable surface roughness and subject to thermalexpansion.

Single lip, outer metal case with reinforcing case. Spring loaded.Installation and sealing identical to Type SB, it is preferred for larger size application.

Twin lips, rubber covered, spring loaded.An Extra lip is required to exclude foreign matter from the primary sealing lip.



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Twin lips, Bare in outer metal case, spring loaded.Can be used in applications requiring the extra lip for foreign matter exclusion but where the extra strengthof an inner case is not needed.

TB

TB

TA

VC

VB

TA

VC

VB

Twin lips, outer metal case with reinforcing case, Spring loaded.

It is recommended where an extra lip is requested to excluded foreign matter from the primary sealing lip.The inner case provided for maximum strength, rigidity and protection of sealing lip and spring.

Single lip, rubber covered, springless.It is recommended somewhere against grease, secondary application against moderate to medium dustand dirty ingress.

Single lip, outer metal case, springless.Sealing identical to Type VC, metal housing for particularly firm and exact seating in the bore.



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Rubber covered outer, incorporated Two spring-loaded sealing lips for sealing of two medias.

DC

DC

Single lip, outer metal case with reinforcing case, springless.Sealing identical to Type VB, with inner case provided for maximum strength, rigidity and protection ofsealing lip and spring.Same design with twin lip formed as KA type available.

VA

VA

KC

KB

KC

KB

Twin lips, rubber covered, springless.

Sealing identical to Type VC, with an Extra lip is required to exclude foreign matter from the primarysealing lip.

Twin lips, outer metal case, springless.Sealing identical to Type KC, metal housing for particularly firm and exact seating in the bore.



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DB

DA

DB

DA

Bare in outer metal case, incorporated Two spring-loaded sealing lips for sealing of two medias.

Bare in outer metal case with reinforcing case, incorporated Two spring-loaded sealing lips for sealing oftwo medias.

TBG

SG

TBG

SG

Twin lips with garter spring loaded, combines the advantage of reliable static sealing by the elastomericcomponent with secure seating of the metal part of the outer casing.Same design with Single lip Formed as SBG type available.

Single lip, Garter spring loaded, with grooved rubber covered outer.Facilitated easy fitting, avoids risk of springing back or skewed positioning of the seal, higher press-fitoversize for increasing the reliability of the static sealing, above all on housings with increased thermalexpansion.Same design with Twin lips Formed as TG type available.



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TCJ

TCJTwin lips, garter spring loaded, rubber covered outer with PTFE cover on the main lip.

Designed for housing / bore rotated used. Same design available with single lip as OSC.

OTC

OTC

VSB

VSBValve Steam Seals, used in vehicle engine.

HTCL

HTCL (Anti-clockwise)

Oil Seals with Helix line on main lip, It features a profile especially designed use in motor vehiclewith molded lip and left or right or bidirectional helix. It can be used for high RPM or pivoting shaftapplications.



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SEC

SEC

TCA

TCA

HTCR (Clockwise)

HTCR

HTGW

HTGW (B i -direction)

Anti High Pressure Design Used




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DC4Y

DC4Y

TC4

TC4

TCN

TCV

TCN

TCV

Recommended for Shock Absorber used.

Recommended for Shock Absorber used.





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VR1

VR2

VR1

VR2

SCJY

SCJY

V-Ring

Is a simple & versatile elastomeric face type seals, it can be the primary sealing element in anapplication or it can be a contaminant excluder or back-up seal.

ISZ

ISZ

Power Steering Used Seals

Power Steering Used Seals



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SCAY

SCAY

RCA5

RCA5

RCA

RCA

TC3

TC3

End Cover

End Cover

Other type of Seals

Other type of Seals



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TC5

TC6

TC5

TC6

TC6Y

TC6Y

TCU

TCU

Other type of Seals

Other type of Seals

Other type of Seals

Other type of Seals



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TC9

TM

TC9

TM

TZ

TZ

TCK

TCK

Other type of Seals

Other type of Seals

Other type of Seals

Other type of Seals



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QLF

QLF

QLN

QLN

M

M

Complex Seals Recommended for tractors used.





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Factors Affect Sealing

Application Design

Application design has a direct rdlationship on seal performance.

To select the right oil seals for sealing application is necessarily

determined by the operating conditions under which the seal must

function. Incorrect application design failed in sealing.

Medium To Be Sealed

Chemical effects of media being sealing have a determininginfluence, particularly as operating temperature increase.

The sealing compound may either harden or soften depending

upon the medium's influence.

Hardening results from:Aging phenomena, especially at elevated

temperature, caused by media to be sealed.

Softening results from:Swelling due to media to be sealed.

TemperatureThe temperature directly at the sealing edge has a marked

influence on the life of a seal, In every case this temperature

depends on the heat dissipation conditions at the location where

the seal is installed. The excess temperature at sealing edge rises

with increasing shaft revolution.

Material used for sealing has its operation temperature limit. In

choosing the correct sealing material is an important consideration.

Shaft Finish

Since the sealing lip contact directly to the shaft, the shaft finish is

important for proper seal performance. The shaft finish should be

10-25 micro-inches AA with no machine lead. This shaft finish can

be obtained by plunge grinding.



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Machine lead (helical scores) causes abrasion to sealing lip and

possibly act as a pump that give rise to leakage.

Shaft Surface HardnessSealing life depends on the contact surface hardness of the shaft.

Surface hardness should be at least Rockwell "C" 30. There is little

indication that hardening above this value will improve the wear

resistance of the shaft.

When contaminated media or dirt may enter from the outside or when

surface speed exceed 15 fps or in situations where the shaft can

be damaged (nicked, scratched, etc ) prior to or during assembly,

minimum hardness must be Rockwill "C" 45. This will help protect theshaft from possible damage, thus maintaining a flaw-free surface for

the seal to run on.

Surface hardness should penetrate to a depth of at least 0.3mm.

Where shafts can not be sufficiently hardened, a wear sleeve may

solve the problem.

Shaft Eccentricity

Seal performance can be impaired by two types of eccentricity:

1. Shaft to bore misalignment:

Shaft to bore misalignment is the distance that the center of shaft

rotation is from the center of the bore.

Misalignment cause uneven wear of the sealing lip resulting in a

shorter life.

2. Dynamic runout: Dynamic runout is twice the distance the enter of the shaft

displaced from the actual center of rotation. Runout usually is

caused by misalignment, shaft imbalance, or actual flexing of the

shaft in the application.

Shaft runout should be avoid if at all possible or should be kept at

minimum limits. Greater runout may cause the sealing lip to lift at

high RPM, due to inertia, causing media leakage.

The shaft seal must be located next to the bearing and bearingplay must be minmized.



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A spring loaded seal with and adequate flex section will operate

satisfactorily if the total eccentricities do not exceed the limits.

Housing Bore And Seal O.D. TolerancesWhen installing shaft seals into thin walled housings or housings

of relatively low elasticity or strength, the danger of breaking or

distorting the housing and seal's case exists. The tolerances of

bore and seal O.D. are important to sure an adeqate press fit.

Please refer JIS B0401 for recommended bore tolerance.

Thermal Expansion of Housing Bore

When light metal, plastic and similar housing warm up, theinterference between the housing and the seal O.D. tends to

decrease. For seals of Type TB, SB (outer metal case) may lead

to leakage at the seal.

Shaft seals of Type TC, SC, VC (rubber covered) are more

capable of follwing the thermal expansion of a light metal housing

because of the elastic rubber covered seal O.D. providing initially

tighter press fit and the higher thermal expansion coefficient of

the compounds.

Housing Bore Finish

A bore finish of at least 100 micro-inches AA (or RMS) without

scratches or removal defects, an O.D. leakage problem should

not be encountered. If the bore finish is rougher than 100 micro-

inches AA (or RMS) a bore sealant-Rubber covered seals should

be used to avoid O.D. leakage. On seals without rubber covered,

a hand applied sealant should be used, but care should be takennot to get any excess sealant on the sealing element or shaft.

Where the lubricant is grease, no bore sealer is required.



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Sealing Lip Dry Running

Sealing lip and shaft damaged by friction of dry running must be

avoid. For this reason greasing or oiling of both seal and shaftmust be done prior to installation to assure sealing lip lubrication

during the first shaft rotation.

The medium to be sealed acts not only as lubricant but also as a

coolant, dissipation frictional heat generated at the seal contact.

Therefore, it must reach the seal contact area in sufficient

quantity during the very first shaft revolutions.

When sealing media having poor lubrication characteristics (e.g.

water and laundry lye), or when the danger of temporary dry runexists, the sealing lip should receive additional lubrication. For

radial shaft seals with dust lip this is accomplished by filling the

space between the two lips with grease.

Surface Speed

Surface speed is the most important factor influence seals

performance. Frictional damage, excess heat and shaft runout

may occurs when surface speed increase. It determines thematerial for sealing and shaft hardness mostly.

Shaft Speed -- Feet/Min.Maximum Pressure

Permissible - PSI

0 to 1000 7

1001 to 2000 5

2001 to Higher 3

Pressure

Typical design fluid seals are not intended to withstand pressure.

Any internal pressure materially reduce seal life, and means shouldbe provided to relieve internal pressure build-up. Special

seal design is required for high pressure sealing.

Standard spring loaded oil seals should not be used when the

operating pressure in the application exceeds the following limits:



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During shaft seal installation, the following instructions should

be observed:

The lead edge of the shaft and lead corner of the seal bore

should have a chamfer or radius to prevent damage to the

sealing element and for ease of installation.

Sealing lips must always face the medium to be sealed. The

lips should be absolutely tree and never tilted or pinched.

Seal lip contact area on the shaft should be smooth and must

be defect free. Seals must be installed concentrically and perpendicularly to

the shaft, the use of suitable installation tools is recommended. Seals must not be axially deformed and must never be used to

transmit forces. Silicone rubber seals need special attention because of their

poor impact strength.

Recommended

1.Lead chamfer

2.Bottom3.Smooth surface

4.Round

Avoid

1.Lead & tool marks

2.Rough surfaced, nicks,

scratches, etc.

3.Tool return groove

4.Sharp edge (Wear a

sleeve is recommended)

5.Keyways, splines, etc.

Recommended

1.Proper surface finish2.Round

3.Lead chamfer or radius

4.Proper hardness

5.Centered in bore

Avoid

1.Lead & tool marks

2.Rough surfaces, nicks

scratches, etc.

3.No chamfer

4.No bottom

Installation Instructions

Shaft Bore



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Installation Instructions

To obtain a solid installation, Seals outer diameter must larger than bore diameter,

suggested as the following table

Nominal Outer Dia.[mm]

Rubber Covered Outer (C type)[mm]

1)

Acc. DIN 3760

Metal Bared Outer (B or A type)[mm]

Acc. DIN 3761

To 50.00+0.30

+0.15

+0.20

+0.10

50.01 80.00+0.35

+0.20

+0.23

+0.13

80.01 120.00

+0.35

+0.20

+0.25

+0.15

120.01 180.00+0.45

+0.25

+0.28

+0.18

180.01 300.00+0.45

+0.25

+0.30

+0.20

300.01 400.00+0.55

+0.33

+0.35

+0.23

400.01 500.00+0.55

+0.30

+0.35

+0.23

1) For Seals having grooved outer surfaces, additional interference allowances are to be agreed upon.

Installation Checklist1. Check the bore. Remove any burrs from the leading edge. The

inside corner of the bore should have a maximum radius of .031"

(78mm).

2. Check the shaft. Remove burrs, nicks, grooves and spiral machine

marks (machine lead).3. Check the shaft end. Remove burrs or sharp edges. lf the shaft

enters the seal against the sealing lip, the end must have a radius

or chamfer or a special installation tool can be used.

4. Check splines and keyways. Sharp edges should be covered with

a lubricated assembly sleeve, shim stock or tape to protect the

seal lip.

5. Check the dimensions. Make sure that shaft and bore diameters

match those specified for the seal being used.6. Check for part interference. Watch out for other machine parts



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that might rub against the seal and cause friction and damaging

heat.

7. Check the seal. Damage may have occurred before installation.

A sealing lip that is turned back, cut or otherwise damagedshould be replaced.

8. Check seal direction. Make sure the new seal faces in the same

direction as the original one. Generally, the lip faces the lubricant

or fluid being retained.

9. Pre-lubricate the sealing element. Before installation, wipe the

sealing element and shaft with the lubricant being retained. While

the O.D. of a metal clad seal can be lightly lubricated to ease

installation, the O.D. of a rubber covered seal should always belubricated.

10. Select the correct installation tool. Press-fitting tools should have

an outside diameter approximately.010" (.25mm) smaller than

the bore size. For best results, the center of the tool should be

open so pressure is applied only at the seal outer edge.

11. Never hammer directly on the surface of the seal. Use proper

driving force such as a soft-face tool arbor press or soft

workpiece (wood). To avoid cocking the seal, apply force evenlyaround the outer edge.

12. To avoid cocking the seal, bottom out the tool on the shaft (Fig.B),

the housing (Fig.C) or bottom out the seal in the housing cavity

(Fig.D).



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Lubricant temperature and lubricant type are two of the most

important factors in material selection for sealing applications.

The compatibility of a lubricant with a seal material may change

the seal's normal operation limits.

The performance of any sealing material depends on the balance

of condition under which it must operate. If the extremes of

temperature, speed, pressure and eccentricity are encounteredsimultaneously in an application, the seal may not function

satisfactorily. In a low temperature environment a seal should

operate only with minimum eccentricity and pressure.

The following diagram is the comparison of general used

materials for sealing applications. It helps to select a right sealing

material where it must function.

Materials



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MaterialOperating Temp.

Advantage Disadvantage Oil Resist AbrasionResist

Nitrile (Buna N) 65 to 225F (18 to 107C)

Low costGood low temp.

ability.Good low swell

charactenstics.

Does not haveexceptional heatresistance.

Compound tend toharden during hightemperature operation.

Very good Excellent

Polyacrylic(PA) 20 to 300F (+7 to 148C)

Resistant to EPadditivesBetter higher

temperature limitthan nitrile.Low swell

characteristics.

Limited low temperatureabilityPoor dry running

characteristics.

Very good Fair

Silicone 80 to 350F (27 to 177C)

Very good heatresistance.

Excellent low

temperatureperformance.

Easily damaged duringhandle and installation.

Poor chemical resistance

to oxidized oils andcertain EP additives.

High swell problem insome lubricants.

Poor dry runningperfomance.

Fair Poor

Fluoro Elastomer 40 to 400F (5 to 205C)

Excellent hightemperaturecapability.

Compatible witha wide range offluids.

Very long life.

Very expensive inrelation to other sealcompounds.

Excellent Good

Leather 50 to 200F (10 to 93C)

Good dry runningcharacteristics.

Poor heat resistance.More expensive than nitrile.

Good Excellent

Materials



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The selection of the right Oil Seals for any sealing application

is necessarily determined by the operating conditions under

which the seals must function. To assist you in making the

proper selection, the previous pages have given the conditions

and limitations. We please refer to the appendix for the available

sizes.

If difficulty arises in designing and applications, or the

specifications you need but out-listed in our catalogue, please

don't hesitate to contact with our representives or directly to us

for engineering asistance.

Material used for sealing of any size and type listed, may

produced by NBR(Nitrile), Polyacrylic compound (PA), Silicone,

Fluoro-elastomer(Viton)or Leather under a basic amount of

order.

Inventory list of WLK Oil sealsSize section

Appendix

CD Attached



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WLK OIL SEALSMakes Life More Enjoyable



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wlk oil seals

Documents

wlk oil seals manualhttp

ua ttp

oil resistant

koil seals

high quality ofwlk oil

iso certificatethis

rigid quality control

strict quality control