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FrontsealRubber V-Rings for axial dynamic sealing
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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.
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Contents
1 Description2 Standard SeaI Types3 Elastomeric Sealing Materials4 Installation and operation5 Production and Quality Assurance6
Storage and Handling
7 Standard size
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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.
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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)
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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
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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
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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.
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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.
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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
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FRONTSEAL
VA
Shaft diameter Ring dimensions mm Mounting dimensions mmRef.
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
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FRONTSEAL
VS
Shaft diameter Ring dimensions mm Mounting dimensions mmRef.
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
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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
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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.
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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/