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8417.8/20-EN
9.3 Flange dimensions
Fig. 25:
Pipe flange dimensions
Ø2a :
Maximum permissible inside diameter of the pipe flange
Ø2b :
Outside diameter
Ø3 :
Minimum inside diameter of the pipe flange
Ø6 :
Minimum outside diameter of the raised face
If the butterfly valve is used for downstream dismantling, the tightening torque must
be lower than:
C1 max. (mdaN) for valve body type 2
C2 max. (mdaN) for valve body type 4
Table 19:
Pipe flange dimensions [mm]
DN
NPS
Ø2a
Ø2b
Ø3
Ø6
C1
C2
20
¾
32
27
-
46
0.4
5
25
1
37
34
15
55
0.4
5
32
1 ¼
46
43
31
67
0.8
5
40
1 ½
54
49
32
77
1
5
50
2
63
61
33
86
1.3
5
65
2 ½
80
77
55
107
1.6
5
80
3
93
89
71
121
2.7
5
100
4
116
115
90
141
3
5
125
8
141.5
140
119
171
3.2
5
150
6
170.5
7)
169
144
196
4.7
10
200
8
222
7)
220
196
250
6
10
250
10
276.5
7)
273
249
306
8.1
10
300
12
327.5
7)
324
297
358
10
10
350
14
361
356
326
399
-
10
400
16
412
407
370
452
-
16
450
18
463
457
422
505
-
24
500
20
515
508
470
558
-
-
600
24
617
610
566
664
-
-
7
Make sure that the body is centred properly between the flange bolts.
Summary of Contents for BOAX-B
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