Bray 31U - Manual (Page 9)

All information herein is proprietary and confidential 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