Data Sheet

A81 Valve
D103301X012
Product Bulletin
21.1:A81
July 2012
15
Table 11. Fisher A81 Valve Breakout Torque Requirements
TRIM CONFIGURATION: SOFT SEAL WITH PEEK/PTFE BEARINGS
VALVE
SIZE
SHAFT DIA
TORQUE, NSm
Shutoff nP
max
DN mm 3bar 7bar 10 bar 15 bar 20 bar 25 bar 35 bar 45 bar 50 bar
50 12.7 12.8 14.7 16.2 18.7 21.1 23.6 28.5 33.4 35.9
80 15.9 19.7 23.4 26.1 30.7 35.3 39.9 49.1 58.2 62.8
100 19.1 31.1 37.6 42.4 50.5 58.7 66.8 83.0 99.2 107
150 25.4 60.8 75.9 87.2 106 125 144 181 219 238
200 31.8 103 135 158 198 237 276 355 434 473
250 31.8 159 212 252 318 385 451 584 --- ---
300 38.1 228 310 371 473 576 678 883 --- ---
VALVE
SIZE
SHAFT DIA
TORQUE, LbfSin
Shutoff nP
max
NPS Inch
50
psid
100
psid
150
psid
200
psid
300
psid
400
psid
500
psid
600
psid
750
psid
2 1/2 115 130 145 160 190 220 250 280 325
3 5/8 178 206 234 262 318 374 430 486 570
4 3/4 282 331 381 430 529 628 727 826 975
6 1 553 668 783 898 1130 1360 1590 1820 2160
8 1-1/4 945 1190 1430 1670 2150 2630 3110 3590 4310
10 1-1/4 1460 1870 2270 2680 3490 4300 5110 --- ---
12 1-1/2 2100 2720 3350 3970 5220 6470 7720 8970 ---
TRIM CONFIGURATION: METAL SEAL WITH METAL BEARINGS
VALVE
SIZE
SHAFT DIA
TORQUE, NSm
Shutoff nP
max
DN mm 3bar 7bar 10 bar 15 bar 20 bar 25 bar 35 bar 45 bar 50 bar
50 12.7 37.3 42.4 46.2 52.5 --- --- --- --- ---
80 15.9 67.7 78.9 87.3 101 115 --- --- --- ---
100 19.1 112 134 151 178 208 233 --- --- ---
150 25.4 241 292 331 395 458 --- --- --- ---
200 31.8 310 422 506 646 786 927 --- --- ---
250 31.8 598 761 884 --- --- --- --- --- ---
300 38.1 926 1270 --- --- --- --- --- --- ---
VALVE
SIZE
SHAFT DIA
TORQUE, LbfSin
Shutoff nP
max
NPS Inch
50
psid
100
psid
150
psid
200
psid
300
psid
400
psid
500
psid
600
psid
750
psid
2 1/2 336 374 413 451 --- --- --- --- ---
3 5/8 611 696 782 867 1040 --- --- --- ---
4 3/4 1020 1180 1350 1520 1850 --- --- --- ---
6 1 2190 2580 2970 3360 4140 --- --- --- ---
8 1-1/4 2860 3710 4570 5420 7130 --- --- --- ---
10 1-1/4 5450 6700 7950 --- --- --- --- --- ---
12 1-1/2 8540 11200 --- --- --- --- --- --- ---