Bray 31U - Manual (Page 8)

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 : 8
Series 20/21 and 30/31/3A Torques (Lb-Ins)
Valve Differential Pressure (PSIG)
Valve
Size
Inches
Full Disc Reduced Disc
0 psi 50 psi 100 psi 150 psi 175 psi 0 psi 50 psi
Class A
Non-Corrosive,
Lubricating
Service
1 54 59 65 70 73 54 59
1.5 81 86 91 97 100 81 86
2 109 114 119 123 128 109 114
2.5 169 178 187 196 200 169 178
3 220 236 250 264 273 220 236
4 341 364 387 410 423 225 248
5 510 560 610 660 687 324 374
6 632 712 792 872 912 344 488
8 1,182 1,341 1,500 1,660 1,741 735 894
10 1,764 2,018 2,272 2,526 2,653 1,204 1,358
12 2,701 3,110 3,519 3,928 4,132 1,665 2,074
14 3,818 4,500 5,182 5,864 –– 2,318 3,000
16 4,638 5,819 7,000 8,182 –– 2,699 3,880
18 5,265 7,065 8,865 10,665 –– 2,970 4,788
20 7,000 9,364 11,728 14,091 –– 3,356 6,243
Class B
General Service
1 59 65 71 77 80 59 65
1.5 89 95 100 106 110 89 95
2 120 125 130 135 140 120 125
2.5 185 195 205 215 220 185 195
3 245 260 275 290 297 245 260
4 375 400 425 450 462 252 267
5 560 615 670 725 755 355 410
6 695 783 871 953 1,003 427 537
8 1,300 1,475 1,650 1,825 1,915 808 983
10 1,960 2,240 2,520 2,800 2,940 1,213 1,493
12 2,970 3,420 3,870 4,320 4,545 1,830 2,280
14 4,200 4,950 5,700 6,450 –– 2,550 3,300
16 5,100 6,400 7,700 9,000 –– 2,967 4,267
18 5,850 7,850 9,850 11,850 –– 3,267 5,267
20 7,700 10,300 12,900 15,500 –– 4,267 6,867
Class C
Severe Service
1 74 82 89 97 100 74 82
1.5 111 119 125 133 137 111 119
2 151 157 163 169 175 151 157
2.5 231 244 257 269 275 231 244
3 306 325 344 363 375 306 325
4 468 500 532 563 582 316 348
5 700 769 838 907 944 444 513
6 870 980 1,090 1,200 1,255 525 672
8 1,625 1,844 2,063 2,282 2,394 1,011 1,230
10 2,450 2,800 3,150 3,500 3,675 1,517 1,867
12 3,712 4,275 4,838 5,400 5,682 2,287 2,850
14 5,251 6,188 7,125 8,063 –– 3,189 4,126
16 6,375 8,000 9,625 11,250 –– 3,709 5,334
18 7,315 9,815 12,315 14,815 –– 4,084 6,584
20 9,625 12,875 16,125 19,375 –– 5,334 8,584