Lens gaskets
The proven high-pressure gaskets
Lens gaskets are reusable, as the sealing effect is generally achieved by elastic deformation of the surfaces.
We can also specially produce bellows lenses, lens blind
spectacle gaskets and half-lenses.
The projected sealing width bG is calculated in relation to the
angle a, which forms the sealing surface against the direction of the force (tubular axis) depending on the E modulus
EG and the surface pressure exerted by bG = 100 · σ / EG · r ·
sinα.
Lens blind spectacle gaskets are made of a sealing lens
and a lens blind, which are connected by a ligament. It is
also usual to use lens blinds on their own. In this case, it is
useful to weld on a small plate to render the lens blind distinguishable.
Gasket profiles
Profile
Profile A5BS
Specify DN, PN, size
a and d when ordering
Cross-section
A5
06
A5S
A5BS
Lens gaskets are impervious to overpressure. With increasing loads, the contact surface between the spherical lens
surface and the spherical flange groove increases, so that
the surface pressure only increases to a lesser extent.
A disadvantage with standard sealing lenses is that, at high
pressures and temperatures, the sealing lens can bulge
along the circumference and weaken the tension of the connection. Also, at greater nominal diameter, the flange can
become stuck in the area of the raised face diameter d5 and
lift up at the sealing diameter.
Steel type
designation
Material
number
For circulatory
temperatures
Code designation
on the outer edge
S235JRG2
P265GH
16Mo3
13CrMo4-5
10CrMo9-10
X6CrNiTi18-10
12CrMo19-5
1.0038
1.0425
1.5415
1.7335
1.7380
1.4541
1.7362
to 425 0C
to 425 0C
425 to 475
425 to 520
520 to 580
350 to 550
max. 650 0C
none
none
1 Punch mark
2 Punch marks
3 Punch marks
4 Punch marks
1 notch
X6CrNiMoTi17-12-2
1.4571
max. 550 0C 3 notches
Further technical data see section “Materials commonly used”.
µm
Surface pressure
limits for 20 °C
N/mm2
N/mm2
E modulus at 20 °C
kN/mm2
2
Surface pressure
limits for 300 °C
N/mm
N/mm2
E modulus at 300 °C
kN/mm2
Steel St 35
copper-plated
Stainless steel
1.4828
3,2
6,3
1,6
3,2
1,6
3,2
3,2
6,3
6,3
12,5
3,2
6,3
3,2
6,3
σv
σϑ
235
525
300
675
400
900
335
750
400
900
135
600
100
750
135
300
260
660
210
210
210
200
200
210
200
128
178
235
315
300
585
400
730
335
630
400
750
135
390
100
630
135
150
260
650
185
185
190
186
186
185
186
114
175
σv
σϑ
Kempchen Dichtungstechnik GmbH · Tel. +49 (0)208 8482 0 · Fax. +49 (0)208 8482 285 · info@kempchen.de · www.kempchen.de
88
Lens gaskets
Monel 2.4360
3,2
6,3
Steel 1.4541
silver-plated
Heatresistant mild
steel 1.7362
3,2
6,3
Iron 1.1003
from
to
Materials
Recommended max. roughness
of the flange surfaces
Stainless steel
1.4541
A5, A5S, A5BS
Heat-resistant
mild steel
1.5415
Profile
Copper 2.0090
Gasket limiting values
Lens gaskets
The proven high-pressure gaskets
DN
d1
d2
50
65
80
100
125
150
200
55
70
82
107
131
158
205
78
102
116
143
180
210
276
10
15
25
40
50
65
80
100
125
150
200
43
54
69
81
105
128
155
200
62
78
102
116
143
180
210
276
d5
PN 63
68
85
97
127
157
183
243
PN 100
55
68
85
97
127
157
183
243
PN 160
Lens gaskets for flange connections PN 63 to PN 400
h
r
x
13,6
18,3
18,3
22,1
31,2
34,9
40,5
90
113
131
171
210
249
327
9
13
13
15
22
26
27
12,2
13,9
18,7
18,7
22,8
32,3
36,0
42,2
71
89
112
130
169
208
146
323
8
9
13
13
15
22
26
27
10
15
25
40
50
65
80
100
125
150
175
200
42
53
67
77
99
120
144
166
188
62
78
102
116
143
180
210
243
276
55
68
85
97
127
157
183
218
243
PN 250
12,6
14,3
19,4
20,1
24,8
35,0
39,7
39,2
44,3
70
88
110
127
165
202
239
280
314
8
9
13
13
15
22
26
21
25
15
25
40
50
65
80
100
125
150
200
27
39
48
61
80
99
121
143
195
43
62
78
102
116
143
180
210
276
39
55
68
85
97
127
157
183
243
PN 320
10,2
13,6
15,9
21,4
19,0
24,8
34,6
40,1
41,9
48
68
85
106
129
165
203
238
320
6
8
9
13
13
15
22
26
25
27
39
55
68
85
97
157
183
218
243
PN 400
10,0
11,1
14,5
16,0
19,3
20,1
31,9
39,7
39,9
45,3
10
15
25
40
50
65
80
125
150
175
200
10
15
25
40
50
65
80
100
125
150
200
(„a“)*
DIN 2696 : 1999-08, Series 1
06
Conforms to DIN 2696 : 1999-08*
Ordering example for a lens gasket, DN 100, PN 63,
conforming to DIN 2696, made of ...1):
Lens gasket, DN 100, PN 63, DIN 2696 Series 1 / 1.7335
15
24
36
48
67
77
129
144
164
185
41
52
70
80
96
134
150
193
28
43
62
78
102
116
180
210
243
276
62
78
102
116
143
180
210
276
55
68
85
97
127
157
183
243
12,9
14,6
18,3
19,0
25,9
30,2
37,7
42,6
31
46
66
84
111
127
209
239
279
312
70
87
113
129
162
212
243
319
6
6
8
9
13
13
22
26
21
25
8
9
13
13
15
22
26
25
DIN 2696 : 1999-08, Series 2
DN
d1
d2
d5
PN 63
68
127
157
183
PN 100
h
r
x
14,6
24,5
33,6
38,4
87
166
205
242
9
15
22
26
50
100
125
150
52
100
124
148
78
143
180
210
10
15
25
40
50
100
125
150
25
39
51
98
121
145
43
62
78
143
180
210
39
55
68
127
157
183
PN 160
10,8
13,6
14,9
25,2
34,6
39,4
47
68
87
164
203
240
6
8
9
15
22
26
10
15
25
40
50
100
125
150
25
38
49
92
113
134
43
62
78
143
180
210
10,8
13,9
15,6
27,2
37,3
43,1
46
67
86
160
197
232
6
8
9
15
22
26
15
25
40
50
15
23
35
45
28
43
62
78
10,0
11,4
14,9
16,9
31
45
65
82
6
6
8
9
10
15
25
40
100
125
9
14
20
32
101
119
21
28
43
62
143
180
39
55
68
127
157
183
PN 250
27
39
55
68
PN 320
18
27
39
55
127
157
9,0
10,3
12,3
15,7
24,2
35,3
20
30
43
64
167
202
6
6
6
8
15
22
Dimensions in mm
1) Specify material when placing order
* Sealing lenses with dimensions conforming to with DIN 2696 April 1972 edition must always
be arranged in advance. To avoid misunderstandings the desired sealing lens height “a”
should always be given for the internal diameter d1 specified.
Dimensions in mm
Kempchen Dichtungstechnik GmbH · Tel. +49 (0)208 8482 0 · Fax. +49 (0)208 8482 285 · info@kempchen.de · www.kempchen.de
Lens gaskets
89
Lens gaskets
The proven high-pressure gaskets
Lens gaskets for flange connections
PN 63 to PN 400
06
Works standard 1082)
Ordering example for a lens gasket with d1=94 mm internal
diameter and d2 = 143 mm external diameter, made of ...1):
Lens gasket 94x143 WN 108 / 1.7335
Works standard 108
DN
d1,min* hmax d1,max* hmin
d2*
r*
d5*
x*
25
32
50
70
88
112
129
170
218
250
18
27
39
55
68
85
97
127
157
183
5,7
6,0
6,0
8,0
9,0
13,0
13,0
15,0
22,0
26,0
218
243
298
345
394
445
28,0
27,0
25,0
26,0
23,0
24,0
218
243
298
345
21,0
25,0
25,0
30,0
PN 63 to PN 400
10
15
25
40
50
65
80
100
125
150
10
14
20
34
46
62
72
94
116
139
8,0
10,0
11,5
15,0
16,5
21,0
21,5
26,0
35,5
41,0
14
18
29
43
55
70
82
108
135
158
(175)
200
250
300
350
400
176
198
246
295
330
385
42,5
42,5
43,0
43,5
45,5
45,5
183
206
257
305
348
395
(175)
200
250
300
162
183
230
278
40,0
45,5
48,0
53,0
177
200
246
285
7,0
21
9,0
28
9,5
43
12,5
62
13,5
78
18,5 102
18,5 116
22,0 143
29,5 180
35,0 210
PN 63 to PN 100
40,5
40,0
39,5
40,5
39,5
42,0
243
276
332
385
425
475
296
329
406
473
538
610
PN 160 to PN 400
35,5
40,0
43,0
51,0
243
276
332
385
296
329
406
473
Dimensions in mm
1)
Specify material when placing order
2) Unless otherwise agreed, the sealing lenses will be supplied
with d1,min and hmax. The interior diameters should be adapted to
the by boring of the integral or collar flanges.
* In accordance with DIN 2696 April 1972.
Kempchen Dichtungstechnik GmbH · Tel. +49 (0)208 8482 0 · Fax. +49 (0)208 8482 285 · info@kempchen.de · www.kempchen.de
90
Lens gaskets