catalogo vrf gb

7/27/2019 Catalogo Vrf Gb

1/15

FrontsealRubber V-Rings for axial dynamic sealing


2/15

www.dichta.com Pag. 2 of 15

DICHTA is a Swiss seal manufacturer with a production facility in Italy and subsidiary marketingcompanies in the UK and in Italy

The DICHTA group consists of:

DICHTA SA - Chiasso (Switzerland) operating in the Swiss and in the international market

DICHTA Srl - Milano (Italy): operating in the Italian market

DIGOM Sas - Torino (Italy): production facility

DICHTA SA was founded in 1981 and DIGOM has been producing rubber products since 1970.


3/15


Contents

1 Description2 Standard SeaI Types3 Elastomeric Sealing Materials4 Installation and operation5 Production and Quality Assurance6

Storage and Handling

7 Standard size


4/15


1 Description

The FRONTSEAL is an all elastomer axial seal for shafts and bearings. It seals axially against acounterface. This type of seal has been used widely for several applications and has proved to bereliable and effective against dust, dirt, water and oil splash and other media.

The ring consist of three parts:

a - The seal body, installed with interference to the shaft.b - The hinge, acting as a sprung connection between the body and the lip.c - The conical self adjusting hp which provides the actual dynamic sealing against the counterface.

The counterface can be the outside of the bearing cap, a washer or any suitable metal pressing.

2 Standard SeaI Types

The FRONTSEAL is manufactured in four standard profiles:

VA type:Is the mostcommon profile. Ithas a perpen-dicular rear face.Wide range ofsizes, from 3 to2020 mm shafts.

VS type:with wide bodyto ensure higherradial force thanVA type. Rangeof sizes from 5to 210 mmshafts.

VL type:this seal isintended forapplicationswhere spaceavailable isIimited. Range ofsizes from 135 to630 mm shafts.

VE type:is our heavy duty largediameter seal, used insteel milIs, paper milIsand rolling milIs as adirt/water excluderseal. A standardclamping band can beused to improve axialfixation.

Other types, modifications or larger diameters available upon request.


5/15


3 Elastomeric Sealing Materials

3.1 Nitrile rubber NBR

This elastomer is a copolymer of butadiene and acrylonitrile and is used for the majority ofconventional fluid sealing applications.

Physical data:

Working temperature range: - 40 C to+ 120 C in oil I+ 90 in water

Tensile strength: up to 15 MPa Standard color: black

Advantages:

Good resistance to mineral oil and grease

Good resistance to water and radiator fluid High tear strength

Limitations:

Poor resistance to high-alloyed hypoid oil

Not resistant to automotive brake fluid (glycol based)

Poor resistance to polar fluids (ketones, ethers, esters)

Poor resistance to chlorinated hydrocarbons (carbon tetrachioride, trichlorethylene) Poor resistance to aromatic solvents

3.2 Fluorinated rubber FPM

Mostly known under the trade name VITON from Du Pont, TECHNOFLON from Montedisonand FLUOREL from 3M.It has good chemical resistance and is recommended for high temperature applications.

Physical data:

Working temperature range: -30C to + 200 C

Tensile strength: up to 15 MPa Standard colour: brown

Advantages:

Excellent resistance to mineral oil and above all high-alloyed hypoid oils

Excellent acid resistance

Good resistance to aromatic and chlorinated hydrocarbons Excellent resistance to ageing, ozone and weathering

Limitations: Limited cold flexibility Poor resistance to polar fluids (ketones, ethers, esters)


6/15


3.3 Silicone Rubber SILAlso referred to as MVQ

Physical data:

Working temperature range: -60 C to +220 C Tensile strength: approx. 3-7 MPa Standard colour: red

Advantages:

Retains flexibility down to very low temperatures

Withstands continuous heating at high temperatures without hardening

Resistant to mineral oils and greases

Excellent resistance to ageing, weathering and ozone Good chemical resistance to alkalis

Limitations:

Not recommended for use with hydrocarbons, such as petrols and paraffin, and lightermineral oils

Not resistant to hot water, acids and non-mineral automotive brake fluids.

Poor tensile and tear strength Poor wear resistance

3.4 Chloroprene rubber CRMostly known under the trade name NEOPRENE from Du Pont.

Physical data:

Working temperature range: -40C to +80 C Tensile strength: up to 15 MPa

Advantages:

Excellent resistance to ageing, weathering and ozone Moderate resistance to mineral oils and greases

Limitations:

Tends to harden or stiffen at low temperatures Not resistant to non-mineral automotive brake fluids


7/15


4 Installation and operation

4.1 Fitting

Fitting of the FRONTSEAL is very simple. The ring must be slightly stretched and pushedalong the shaft. It can either be done manually or with a simple tool, in a way that the distanceto the counterface can be maintained constant using little pressure.

4.2 Eccentricity IMisalignment

The V-shape of FRONTSEAL provides an effective and reliable sealing even with ovalsection or eccentrically turning shafts. Sealing is not even affected by a slightly tiltedcounterface.

FRONTSEAL fitted withpreloading using a tool

tiltedcounterface

FRONTSEALnot preloaded

Oval and/or eccentricallyturning shaft


8/15


4.3 Counterface

The counterface finish is very important for an efficient sealing and for useful life of the seal.

The surface must be smooth, free of scratches and sharp peaks, finish of Rt=1 to 4 m.Several materials can be used: soft metals, (light alloy, cast metal, etc.) only in well lubricatedapplications.For unlubricated applications the surface should be treated with a dry lubricant such asMolykote spray.

4.4 Peripheral speed

At peripheral speed up to 8 m/s the lip of the FRONTSEAL has a good pressure against thecounterface and it has the function of a light contact seal.Over 8 m/sthe seal must be supported axially and above 12 m/s radial retention is necessary,mounting the FRONTSEAL in an axial groove or applying an adequate support.


9/15


5 Production and Quality Assurance

Our FRONTSEAL is manufactured according to Quality Assurance Standards ISO 9002. Allproduction phases are checked and all measurements are recorded and stored far eventualtracing.

Our FRONTSEAL is individually inspected to ensure that sealing edge and sealing band arewithout faults. Also small cracks and shorts which could cause a split during mounting orfunctioning of the seal are not accepted.

6 Storage and Handling

Some storage precautions must be taken in order to avoid deterioration of the material.FRONTSEAL should be stored in a dust free and dry atmosphere and they must be kept in theiroriginal envelope which should only be opened just before installation. Samples should be repackedafter inspection.

Do not drop FRONTSEAL

on shelves or boxes, nor hang seals on hooks, wires or nails, since ineither case the seal can be damaged.Seals should be stored on a first-in first-out basis to avoid ageing on the shelf. Avoid storage nearsources of heat or near electrical equipment that may generate ozone. Also keep away from directsunlight.Avoid unnecessarily compressing the lip during storage.


10/15


7 Standard size

FRONTSEAL

VA

Shaft diameter Ring dimensions mm Mounting dimensions mmRef.

C d D h H d2 d1 H1

VAVAVA

VAVA

345

67

2,73,54,5

5,56,5

---

--

3,54,55,5

6,58

2,53,24

56

5,57,28

910

2,12,42,4

2,42,4

33,73,7

3,73,7

C + 1C + 1C + 1

C + 1C + 1

C +C +C +

C +C +

466

66

2,533

33

0,30,40,4

0,40,4

VAVAVAVAVA

810121416

89,5

11,513,515,5

-----

9,511,513,515,517,5

79

10,512,514

111516,518,520

2,43,43,43,43,4

3,75,55,55,55,5

C + 1C + 2C + 2C + 2C + 2

C +C +C +C +C +

69999

34,54,54,54,5

0,40,60,60,60,6

VAVAVAVAVA

1820222528

17,519212427

-----

1921242729

1618202225

2226283033

3,44,74,74,74,7

5,57,57,57,57,5

C + 2C + 2C + 2C + 2C + 3

C +C +C +C +C +

912121212

4,56666

0,60,80,80,80,8

VAVAVAVAVA

3032353840

2931333638

-----

3133363843

2729313436

3537394246

4,74,74,74,75,5

7,57,57,57,59

C + 3C + 3C + 3C + 3C + 3

C +C +C +C +C +

1212121215

66667

0,80,80,80,81

VAVAVAVAVA

4550556065

4348535863

-----

4853586368

4045495458

5055596468

5,55,55,55,55,5

99999

C + 3C + 3C + 3C + 3C + 3

C +C +C +C +C +

1515151515

77777

11111

VAVAVA

VAVA

707580

8590

687378

8388

---

--

737883

8893

636772

7681

757984

8893

6,86,86,8

6,86,8

111111

1111

C + 4C + 4C + 4

C + 4C + 4

C +C +C +

C +C +

181818

1818

999

99

1,21,21,2

1,21,2

VAVAVAVAVA

95100110120130

9398

105115125

-----

98105115125135

859099

108117

97102113122131

6,86,87,97,97,9

111112,812,812,8

C + 4C + 4C + 4C + 4C + 4

C +C +C +C +C +

1818212121

99

10,510,510,5

1,21,21,51,51,5

VAVAVAVAVA

140150160170180

135145155165175

-----

145155165175185

126135144153162

140149160169178

7,97,9999

12,812,814,514,514,5

C + 4C + 4C + 5C + 5C + 5

C +C +C +C +C +

2121242424

10,510,5121212

1,51,51,81,81,8

VA

VA

190

199

185

195

-

-

195

210

171

180

187

196

9

9

14,5

14,5

C + 5

C + 5

C +

C +

24

24

12

12

1,8

1,8


11/15


FRONTSEAL

VA


C d D h H d2 d1 H1

VAVAVAVA

VA

200220250275

300

190210235265

290

----

-

210235265290

310

180198225247

270

210228255277

300

14,314,314,314,3

14,3

25252525

25

C + 10C + 10C + 10C + 10

C + 10

C +C +C +C +

C +

45454545

45

20202020

20

4444

4VAVAVAVAVA

325350375400450

310335365390430

-----

335365390430480

292315337360405

322345367390435

14,314,314,314,314,3

2525252525

C + 10C + 10C + 10C + 10C + 10

C +C +C +C +C +

4545454545

2020202020

44444

VAVAVAVAVA

500550600650700

480530580630665

-----

530580630665705

450495540600630

480525570630660

14,314,314,314,314,3

2525252525

C + 10C + 10C + 10C + 10C + 10

C +C +C +C +C +

4545454545

2020202020

44444

VAVAVAVAVA

725750800850900

705745785830875

-----

745785830875920

670705745785825

700735775815855

14,314,314,314,314,3

2525252525

C + 10C + 10C + 10C + 10C + 10

C +C +C +C +C +

4545454545

2020202020

44444

VAVAVAVAVA

9501000105011001150

920965

101510651115

-----

9651015106511151165

865910955

10001045

895940985

10301075

14,314,314,314,314,3

2525252525

C + 10C + 10C + 10C + 10C + 10

C +C +C +C +C +

4545454545

2020202020

44444

VAVAVAVA

VA

1200125013001350

1400

1165121512701320

1370

----

-

1215127013201370

1420

1090113511801225

1270

1120116512101255

1300

14,314,314,314,3

14,3

25252525

25

C + 10C + 10C + 10C + 10

C + 10

C +C +C +C +

C +

45454545

45

20202020

20

4444

4VAVAVAVAVA

14501500155016001650

14201470152015701620

-----

14701520157016201670

13151360140514501495

13451390143514801525

14,314,314,314,314,3

2525252525

C + 10C + 10C + 10C + 10C + 10

C +C +C +C +C +

4545454545

2020202020

44444

VAVAVAVAVA

17001750180018501900

16701720177018201870

-----

17201770182018701920

15401585163016751720

15701615166017051750

14,314,314,314,314,3

2525252525

C + 10C + 10C + 10C + 10C + 10

C +C +C +C +C +

4545454545

2020202020

44444

VAVA

19502000

19201970

--

19702020

17651810

17951840

14,314,3

2525

C + 10C + 10

C +C +

4545

2020

44


12/15


FRONTSEAL

VS


C d D h H d2 d1 H1

VSVS

VSVSVS

56

78

10

4,55,5

6,58

9,5

--

---

5,56,5

89,5

11,5

45

679

89

101115

3,93,9

3,93,95,6

5,25,2

5,25,27,7

C + 1C + 1

C + 1C + 1C + 2

C +C +

C +C +C +

66

669

4,54,5

4,54,56,7

0,40,4

0,40,40,6

VSVSVSVSVS

1214161820

11,513,515,517,519

-----

13,515,517,51921

10,512,5141618

16,518,5202226

5,65,65,65,67,9

7,77,77,77,7

10,5

C + 2C + 2C + 2C + 2C + 2

C +C +C +C +C +

9999

12

6,76,76,76,79

0,60,60,60,60,8

VSVSVSVSVS

2225283032

2124272931

-----

2427293133

2022252729

2830333537

7,97,97,97,97,9

10,510,510,510,510,5

C + 2C + 2C + 3C + 3C + 3

C +C +C +C +C +

1212121212

99999

0,80,80,80,80,8

VSVSVSVSVS

3538404550

3336384348

-----

3638434853

3134364045

3942465055

7,97,99,59,59,5

10,510,5131313

C + 3C + 3C + 3C + 3C + 3

C +C +C +C +C +

1212151515

99

111111

0,80,8111

VSVSVSVSVS

5560657075

5358636873

-----

5863687378

4954586367

5964687579

9,59,59,5

11,311,3

131313

15,515,5

C + 3C + 3C + 3C + 4C + 4

C +C +C +C +C +

1515151818

11111113,513,5

1111,21,2

VSVS

VSVSVS

8085

9095100

7883

889398

--

---

8388

9398105

7276

818590

8488

9397102

11,311,3

11,311,311,3

15,515,5

15,515,515,5

C + 4C + 4

C + 4C + 4C + 4

C +C +

C +C +C +

1818

181818

13,513,5

13,513,513,5

1,21,2

1,21,21,2

VSVSVSVSVS

110120130140150

105115125135145

-----

115125135145155

99108117126135

113122131140149

13,113,113,113,113,1

1818181818

C + 4C + 4C + 4C + 4C + 4

C +C +C +C +C +

2121212121

15,515,515,515,515,5

1,51,51,51,51,5

VSVSVSVSVS

160170180190199

155165175185195

-----

165175185195210

144153162171180

160169178187196

1515151515

20,520,520,520,520,5

C + 5C + 5C + 5C + 5C + 5

C +C +C +C +C +

2424242424

1818181818

1,81,81,81,81,8


13/15


FRONTSEAL

VL

Reference Shaft diameter d

VLVLVLVLVL

140150160170180

135145155165175

-----

145155165175185

126135144153162

VL

VLVLVLVL

190

200220250275

185

195210233260

-

----

195

210233260285

171

182198225247

VLVLVLVLVL

300325350375400

285310335365385

-----

310335365385410

270292315337360

VLVLVLVLVL

425450500550600

410440480530580

-----

440480530580630

382405450485540

Ring dimensionsH = 10,5h = 6,0W = 6,5

Assembling dimensionsH1 = 8 1,5d2 max = C + 5d1 min = C + 20


14/15

Pag. 14 of 15

FRONTSEAL

VE

Reference Shaft diameter dVEVEVEVEVE

450455460465470

450455460465470

-----

455460465470475

439444448453458

VEVEVEVEVE

475480485490495

475480485490495

-----

480485490495500

463468473478483

VEVEVEVE

VE

500505510515

520

500505510515

520

----

-

505510515520

525

488493497502

507VEVEVEVEVE

525530535540545

525530535540545

-----

530535540545550

512517521526531

VEVEVEVEVE

550555560565570

550555560565570

-----

555560565570575

536541546550555

VEVEVEVEVE

575580585590600

575580585590600

-----

580585590600610

560565570575582

VEVEVEVEVE

610620630640650

610620630640650

-----

620630640650660

592602612621631

VEVEVEVEVE

660670680690700

660670680690700

-----

670680690700710

640650660670680

VEVEVEVEVE

710720730740750

710720730740750

-----

720730740750758

689699709718728

VEVEVEVEVE

760770780790800

758766774783792

-----

766774783792801

735743751759768

VEVE

810820

801810

--

810821

777786

Reference Shaft diameter dVEVEVEVEVE

830840850860870

821831841851861

-----

831841851861871

796805814824833

VEVEVEVEVE

880890900920930

871882892912922

-----

882892912922933

843853871880890

VEVEVEVE

VE

940950960970

980

933944955966

977

----

-

944955966977

988

900911921932

942VEVEVEVEVE

9901000102010401060

988999

101010251045

-----

9991010102510451065

953963973990

1008

VEVEVEVEVE

10801100112011401160

10651085110511251145

-----

10851105112511451165

10271045106510841103

VEVEVEVEVE

11801200122012401260

11651185120512251245

-----

11851205122512451270

11211139115711761195

VEVEVEVEVE

12801300132513501375

12701295131513401365

-----

12951315134013651390

12181240125912811305

VEVEVEVEVE

14001425145014751500

13901415144014651490

-----

14151440146514901515

13281350137413971419

VEVEVEVEVE

15251550157516001650

15151540157016001640

-----

15401570160016401680

14431467149515241559

VEVEVEVEVE

17001750180018501900

16801720176518101855

-----

17201765181018551905

15961632167117141753

VEVE

19502000

19051955

--

19552010

17941844

Ring dimensionsH = 65h = 32W = 30

Assembling dimensionsH1 = 50 12d2 max = C + 24d1 min = C + 115

FRONTSEAL VE can easily be fitted witha standard clamping band for axial fixationin high speed applications.


15/15

DICHTA SA

Via Sottobisio 42f BalernaP.O. Box 219 CH-6830 CHIASSO 3 Switzerland

Tel. ++41 91 683 85 02 Fax ++41 91 683 00 50Internet: www.dichta.com - E-mail [email protected]
http://www.dichta.com/http://www.dichta.com/

catalogo vrf gb

Documents