Owner manual
All information herein is proprietary and condential and may not be copied or reproduced without the expressed written consent of BRAY INTERNATIONAL, Inc.
The technical data herein is for general information only. Product suitability should be based solely upon customer’s detailed knowledge and experience with their application.
Resilient Seated Butterfly Valves – Seating & Unseating Torques
Torque : 9
Series 20/21 and 30/31/3A Torques (N-m)
Valve Differential Pressure (Bar)
Valve
Size
mm
Full Disc Reduced Disc
0 bar 3.4 bar 7 bar 10.3 bar 12 bar 0 bar 3.4 bar
Class A
Non-Corrosive,
Lubricating
Service
25
6 7 7 8 8 6 7
40
9 10 10 11 11 9 10
50
12 13 13 14 14 12 13
65
19 20 21 22 23 19 20
80
25 27 28 30 31 25 27
100
39 41 44 46 48 25 28
125
58 63 69 75 78 37 42
150
71 80 89 99 103 39 55
200
134 152 169 188 197 83 101
250
199 228 257 285 300 136 153
300
305 351 398 444 467 188 234
350
431 508 585 663 –– 262 339
400
524 657 791 924 –– 305 438
450
595 798 1,002 1,205 –– 336 541
500
791 1,058 1,325 1,592 –– 379 705
Class B
General Service
25
7 7 8 9 9 7 7
40
10 11 11 12 12 10 11
50
14 14 15 15 16 14 14
65
21 22 23 24 25 21 22
80
28 29 31 33 34 28 29
100
42 45 48 51 52 28 30
125
63 69 76 82 85 40 46
150
79 88 98 108 113 48 61
200
147 167 186 206 216 91 111
250
221 253 285 316 332 137 169
300
336 386 437 488 514 207 258
350
475 559 644 729 –– 288 373
400
576 723 870 1,017 –– 335 482
450
661 887 1,113 1,339 –– 369 595
500
870 1,164 1,458 1,751 –– 482 776
Class C
Severe Service
25
8 9 10 11 11 8 9
40
13 13 14 15 15 13 13
50
17 18 18 19 20 17 18
65
26 28 29 30 31 26 28
80
35 37 39 41 42 35 37
100
53 56 60 64 66 36 39
125
79 87 95 102 107 50 58
150
98 111 123 136 142 59 76
200
184 208 233 258 270 114 139
250
277 316 356 395 415 171 211
300
419 483 547 610 642 258 322
350
593 699 805 911 –– 360 466
400
720 904 1,087 1,271 –– 419 603
450
826 1,109 1,391 1,674 –– 461 744
500
1,087 1,455 1,822 2,189 –– 603 970