Labyrinth metal seal

Metallic materials of GMN seal components series L/M guarantee highest resistance against coarse and fine contamination.

Metallic materials are suitable for temperatures up to 200 °C.

 

DI_BF_LM_M30_821x550

Series L/M

Design L

The L design is particularly suited for use with normal spray load for rotating shafts and hubs.

 

Technical data:
  • Outer ring: Aluminum (GD AlSi 12)
  • Inner ring: Non-alloy steel
  • Range of temperature: -40 °– 200 °C
  • Shaft diameter: 15 – 210 mm (customized solutions until max. 270 mm)
  • Width: 10, 14, 15, 20, 22 mm (depending on size)
  • Gap height: Constantly 0.2 – 0.5 mm (depending on size)
  • Sealing gap: Horizontal
  • Axial play: Sax see table of dimensions (total axial movement from one end position to the other)
  • Increased axial clearance: Sax – 1.5 x Sax (on request all types are also available with increased axial play) order name: L dxDxB with increased axial play
  • Radial clearance: Srad = Sax /tan (42.5°)
DI_BF_LM_1
DI_BF_LM_2

Design M with drainage groove

The M design has grooves on the circumference which are used to remove and return penetrated liquid during heavy and direct spray impact.

Technical data:

The technical data for the M design is the same as for the L design.

DI_BF_LM_3
DI_BF_LM_4

Characteristics

  • Frictionless

Thanks to their non-contact design, GMN labyrinth seals guarantee completely frictionless operation.

  • Wear-free

GMN seal components work completely wear-free and offer an unlimited service life.

  • Abrasion-free

The non-contact design of GMN seal components guarantees operation free from metal abrasion that fulfills the highest cleanliness requirements.

  • Effective

The small distance between the outer and inner ring of just approx. 0.2–0.5 mm guarantees a high sealing effect and highly effective protection from fouling.

  • Heat-free

Because no friction heat is generated, neither the seal nor the adjacent components or the lubricant are subjected to thermal loads.

  • Efficient

The frictionless design enables operation without performance losses. This means that the seal offers maximum sealing effect with reduced energy consumption even at high speeds.

  • Compact

GMN labyrinth seals achieve 2–4-layered labyrinths in the smallest space.

  • Effective

The low gap height creates an air cushion in the sealing gap at high circumferential speeds that increases the sealing effect.

  • Return

Drainage grooves on the outer ring return any penetrated liquids (M design).

15 - 20 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
nmax
[rpm]
Weight
kg
[kg]
Item no.
Data sheets

22 - 32 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
nmax
[rpm]
Weight
kg
[kg]
Item no.
Data sheets

35 - 45 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
nmax
[rpm]
Weight
kg
[kg]
Item no.
Data sheets

48 - 58 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
nmax
[rpm]
Weight
kg
[kg]
Item no.
Data sheets

60 - 65 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
nmax
[rpm]
Weight
kg
[kg]
Item no.
Data sheets

68 - 72 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
nmax
[rpm]
Weight
kg
[kg]
Item no.
Data sheets

75- 90 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
nmax
[rpm]
Weight
kg
[kg]
Item no.
Data sheets

100 - 130 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
nmax
[rpm]
Weight
kg
[kg]
Item no.
Data sheets

140 - 170 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
nmax
[rpm]
Weight
kg
[kg]
Item no.
Data sheets

180 - 210 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
nmax
[rpm]
Weight
kg
[kg]
Item no.
Data sheets

15 - 20 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Groove width
c
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
[rpm]
Weight
kg
[kg]
Item no.
Data sheets
M 15 X 26 X 8
15
26
8
3
24
0.35
63500
0.0152
301337
M 18 X 28 X 10
18
28
10
3
26
0.38
56500
0.0171
301341
M 20 X 28 X 10
20
28
10
3
26
0.38
81000
0.0124
301343
M 20 X 30 X 10
20
30
10
3
28
0.38
70500
0.0187
301345

22 - 32 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Groove width
c
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
[rpm]
Weight
kg
[kg]
Item no.
Data sheets
M 22 X 30 X 10
22
30
10
3
28
0.38
71000
0.0135
301347
M 25 X 37 X 10
25
37
10
3
34
0.38
50500
0.0283
301349
M 28 X 39 X 10
28
39
10
3
36
0.38
45500
0.0268
301351
M 30 X 42 X 10
30
42
10
3
39
0.38
48500
0.0331
301353
M 32 X 45 X 10
32
45
10
3
42
0.4
43000
0.0401
301355

35 - 45 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Groove width
c
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
[rpm]
Weight
kg
[kg]
Item no.
Data sheets
M 35 X 47 X 10
35
47
10
3
44
0.4
39500
0.038
301357
M 40 X 52 X 10
40
52
10
3
49
0.4
33000
0.0429
301360
M 42 X 55 X 10
42
55
10
3
52
0.4
30000
0.051
301364
M 45 X 55 X 10
45
55
10
3
52
0.4
30500
0.0349
301366
M 45 X 62 X 10
45
62
10
3
59
0.4
24500
0.0821
301369

48 - 58 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Groove width
c
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
[rpm]
Weight
kg
[kg]
Item no.
Data sheets
M 48 X 62 X 10
48
62
10
3
59
0.4
24500
0.0647
301371
M 50 X 62 X 10
50
62
10
3
59
0.4
28000
0.0526
301373
M 52 X 68 X 10
52
68
10
3
65
0.4
24000
0.0852
301376
M 55 X 68 X 10
55
68
10
3
65
0.4
24000
0.0653
301378
M 58 X 72 X 10
58
72
10
3
68.5
0.4
22000
0.0742
301384

60 - 65 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Groove width
c
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
[rpm]
Weight
kg
[kg]
Item no.
Data sheets
M 60 X 72 X 10
60
72
10
3
68.5
0.4
22000
0.0596
301387
M 60 X 80 X 10
60
80
10
3
76
0.4
18500
0.1275
301389
M 63 X 80 X 10
63
80
10
3
76
0.4
18500
0.1046
301392
M 65 X 80 X 10
65
80
10
3
76
0.4
18500
0.0888
301394
M 65 X 85 X 10
65
85
10
3
81
0.42
17000
0.137
301396

68 - 72 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Groove width
c
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
[rpm]
Weight
kg
[kg]
Item no.
Data sheets
M 68 X 85 X 10
68
85
10
3
81
0.42
16500
0.1122
301400
M 70 X 85 X 10
70
85
10
3
81
0.42
15000
0.144
301404
M 70 X 90 X 10
70
90
10
3
86
0.42
15000
0.1464
301406
M 72 X 90 X 10
72
90
10
3
86
0.42
15000
0.1288
301409

75- 90 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Groove width
c
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
[rpm]
Weight
kg
[kg]
Item no.
Data sheets
M 75 X 90 X 10
75
90
10
3
86
0.42
15000
0.1014
301411
M 80 X 100 X 10
80
100
10
3
95
0.42
14500
0.1575
301420
M 85 X 100 X 10
85
100
10
3
95
0.42
14500
0.1063
301426
M 90 X 110 X 10
90
110
10
3
105
0.42
12000
0.1755
301428

100 - 130 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Groove width
c
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
[rpm]
Weight
kg
[kg]
Item no.
Data sheets
M 100 X 120 X 10
100
120
10
3
115
0.42
10600
0.1935
301433
M 100 X 120 X 10
100
120
14
4
115
0.7
11700
0.25
301437
M 110 X 130 X 15
110
130
15
5
125
0.7
9500
0.2851
301439
M 120 X 140 X 15
120
140
15
5
135
0.7
10000
0.3095
301445
M 130 X 150 X 15
130
150
15
5
145
0.7
9000
0.3339
301449

140 - 170 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Groove width
c
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
[rpm]
Weight
kg
[kg]
Item no.
Data sheets
M 140 X 170 X 15
140
170
15
5
165
0.7
7000
0.6526
301453
M 150 X 180 X 15
150
180
15
5
175
0.7
6500
0.6957
301455
M 160 X 190 X 20
160
190
20
5
184.5
0.8
6000
0.9545
301457
M 170 X 210 X 20
170
210
20
5
204.5
0.8
5000
1.5002
301460

180 - 210 mm Inner diameter

SHOW ALL AGAIN
Inner diameter
ID
[mm]
Outer diameter
OD
[mm]
Width
W
[mm]
Groove width
c
[mm]
Gap diameter
e
[mm]
Axial clearance
Sax
[mm]
Max. speed
[rpm]
Weight
kg
[kg]
Item no.
Data sheets
M 180 X 210 X 20
180
210
20
5
204.5
0.8
5000
1.0659
301463
M 190 X 230 X 20
190
230
20
5
224.5
0.8
4500
1.6613
301468
M 200 X 230 X 20
200
230
20
5
224.5
0.8
4500
1.1773
301470
M 210 X 250 X 22
210
250
22
5
244.5
1
3500
1.9597
301473

Specific installation instructions - series L/M

Surrounding structure (connecting parts)

Tolerances

Housing: K7, Shaft: h 6

Surface quality: Rz  ≤ 16 µm; Ra  ≤ 3.2 µm

Installation

“l” length (chamfering of shaft and housing) depending on the width “W”: l = 0.1 x W

Aluminum outer ring

The aluminum outer ring can be slightly non-round in delivery condition. When the seal is pressed in, the relatively easily malleable ring adapts to the roundness of the hub again.

For production-related reasons, the outer ring can be up to 0.1 mm wider than the inner ring.

GMN labyrinth metal seals are pressed with a calibrating ring (“zero dimension”). The outer ring then springs back again due to its elasticity.

 

Montage_englisch
Blindbild_2x550

Tandem arrangement (L design)

Two metal seals positioned next to each other guarantee absolute leak-tightness with an intermediate drain hole (distance min. 5 mm). Liquid between the seals is drained off reliably.

DI_BF_LM_MO_neu_550x550
Blindbild_2x550

Seals with drainage groove (M design)

In limited spaces that do not permit a tandem arrangement, the M model offers a compromise in compact design. Penetrated liquids are removed via grooves in the outer ring into a ring groove in the housing.

Width of the ring groove in the customer part: R = c + 1 mm (c = groove width)

DI_BF_LM_MO_550x550
Blindbild_2x550