▣ HIGH
PERFORMANCE
BUTTERFLY VALVE TORQUE
1. SEATING & UNSEATING TORQUE VALVES
| UNIT : lbf.inch |
|
CLASS
150
|
TEFLON SEAT
|
METAL SEAT
|
|
SIZE
|
0-150
PSIG
|
285
SIG
|
0-150 PSIG
|
285 PSIG
|
| 2" |
200 |
270 |
564 |
677 |
| 2-1/2" |
200 |
270 |
564 |
677 |
|
3"
|
200
|
270
|
564
|
677
|
|
4"
|
225
|
470
|
903
|
1128
|
|
6"
|
540
|
680
|
1467
|
2144 |
|
8"
|
910
|
1620
|
2031
|
2595
|
|
10"
|
1620
|
2530
|
3385 |
4288
|
|
12"
|
2530
|
3600
|
4513 |
5190 |
| 14" |
3720 |
5970 |
CONSULT
ST&H |
| 16" |
5530 |
9180 |
| 18" |
6840 |
11900 |
| 20" |
10020 |
16970 |
| 24" |
18330 |
32290 |
|
| UNIT : lbf.inch |
|
CLASS
300
|
TEFLON SEAT
|
METAL SEAT
|
|
SIZE
|
0-150
PSIG
|
500
PSIG
|
0-150 PSIG
|
500 PSIG
|
| 2" |
220 |
520 |
900 |
1550 |
| 2-1/2" |
220 |
520 |
900 |
1550 |
|
3"
|
220
|
520
|
220
|
1550
|
|
4"
|
250
|
670
|
460
|
1850
|
|
6"
|
600
|
1120
|
950
|
5700
|
|
8"
|
1000
|
2440
|
1800
|
8100
|
|
10"
|
1800
|
4640
|
2900
|
14500
|
|
12"
|
2790
|
7480
|
4600
|
23600
|
| 14" |
4130 |
10200 |
CONSULT
ST&H |
| 16" |
6140 |
17070 |
| 18" |
7600 |
20400 |
| 20" |
11140 |
31530 |
| 24" |
20370 |
58820 |
|
| UNIT : N.m |
CLASS
150 |
TEFLON SEAT |
METAL SEAT |
SIZE |
10
BAR |
20
BAR |
10
BAR |
20
BAR |
| 2" |
23 |
31 |
64 |
76 |
| 2-1/2" |
23 |
31 |
64 |
76 |
3" |
23 |
31 |
64 |
76 |
4" |
25 |
53 |
102 |
127 |
6" |
61 |
77 |
166 |
242 |
8" |
103 |
183 |
229 |
293 |
10" |
183 |
286 |
382 |
484 |
12" |
286 |
407 |
510 |
586 |
| 14" |
420 |
675 |
CONSULT
ST&H |
| 16" |
625 |
1037 |
| 18" |
773 |
1345 |
| 20" |
1132 |
1917 |
| 24" |
2071 |
3648 |
|
| UNIT : N.m |
CLASS
300 |
TEFLON SEAT |
METAL SEAT |
SIZE |
10
BAR |
20
BAR |
10
BAR |
20
BAR |
| 2" |
25 |
59 |
102 |
175 |
| 2-1/2" |
25 |
59 |
102 |
175 |
3" |
25 |
59 |
102 |
175 |
4" |
28 |
76 |
136 |
209 |
6" |
68 |
127 |
216 |
644 |
8" |
113 |
276 |
463 |
915 |
10" |
203 |
524 |
768 |
1638 |
12" |
315 |
845 |
1028 |
2666 |
| 14" |
467 |
1152 |
CONSULT
ST&H |
| 16" |
694 |
1929 |
| 18" |
859 |
2305 |
| 20" |
1259 |
3562 |
| 24" |
2302 |
6646 |
|
| UNIT : kgf.m |
CLASS
150 |
TEFLON SEAT |
METAL SEAT |
SIZE |
10
kgf.m |
20
kgf.m |
10
kgf.m |
20
kgf.m |
| 2" |
2 |
3 |
6 |
8 |
| 2-1/2" |
2 |
3 |
6 |
8 |
3" |
2 |
3 |
6 |
8 |
4" |
3 |
5 |
10 |
13 |
6" |
6 |
8 |
17 |
25 |
8" |
10 |
19 |
23 |
30 |
10" |
19 |
29 |
39 |
49 |
12" |
29 |
41 |
52 |
60 |
| 14" |
43 |
69 |
CONSULT
ST&H |
| 16" |
64 |
106 |
| 18" |
79 |
137 |
| 20" |
115 |
196 |
| 24" |
211 |
372 |
|
| UNIT : kgf.m |
CLASS
300 |
TEFLON SEAT |
METAL SEAT |
SIZE |
10
kgf.m |
20
kgf.m |
10
kgf.m |
20
kgf.m |
| 2" |
3 |
6 |
10 |
18 |
| 2-1/2" |
3 |
6 |
10 |
18 |
3" |
3 |
6 |
10 |
18 |
4" |
3 |
8 |
14 |
21 |
6" |
7 |
13 |
32 |
66 |
8" |
12 |
28 |
47 |
93 |
10" |
21 |
53 |
78 |
167 |
12" |
32 |
86 |
105 |
272 |
| 14" |
48 |
118 |
CONSULT
ST&H |
| 16" |
71 |
197 |
| 18" |
88 |
235 |
| 20" |
128 |
363 |
| 24" |
235 |
678 |
|
|
| *NOTE |
| |
All torques shown on the chart were derived
from test data using water at 5℃.
For torques using dry gases, multiply these numbers by 1.6.
Above table has additional 30% safety factor to average net torque.
For severe services, or unusual fluids or slurries, consult ST&H.
For 600 & 700 psig Torque, Please consult ST&H. |
2. HYDRODYNAMIC TORQUE VALVES
Td
= Ct x ㅿp
ㅿp = PRESSURE DROP
IN PSIG
Ct = TORQUE COEFFICIENT
FACTOR
Td = DYNAMIC TORQUE IN
INCH POUNDS
|
CLASS
150
|
DISC POSITION IN DEGREES
OPEN
|
|
10°
|
20°
|
30°
|
40°
|
50°
|
60°
|
70°
|
80°
|
90°
|
|
3"
|
1.23
|
1.59
|
2.56
|
4.00
|
6.25
|
9.09
|
14.29
|
12.99
|
15.87
|
|
4"
|
2.38
|
3.03
|
4.76
|
7.69
|
11.49
|
16.39
|
25.00
|
24.39
|
32.26
|
|
6"
|
5.00
|
7.69
|
14.29
|
24.39
|
43.48
|
71.43
|
111.11
|
100.00
|
125.00
|
|
8"
|
12.99
|
19.23
|
31.25
|
55.56
|
90.91
|
158.73
|
256.41
|
217.39
|
238.10
|
|
10"
|
22.73
|
34.48
|
55.56
|
100.00
|
166.67
|
277.78
|
454.55
|
384.62
|
416.27
|
|
12"
|
33.33
|
52.63
|
100.00
|
166.67
|
333.33
|
467.19
|
625.00
|
588.24
|
625.00
|
|
CLASS
300
|
DISC POSITION IN DEGREES
OPEN
|
|
10°
|
20°
|
30°
|
40°
|
50°
|
60°
|
70°
|
80°
|
90°
|
|
3"
|
0.94
|
1.23
|
2.00
|
3.13
|
4.76
|
7.14
|
10.64
|
12.99
|
12.66
|
|
4"
|
1.75
|
2.22
|
3.57
|
5.56
|
8.33
|
12.05
|
18.52
|
22.73
|
23.26
|
|
6"
|
3.70
|
5.88
|
10.42
|
17.54
|
30.30
|
52.63
|
78.74
|
76.92
|
83.33
|
|
8"
|
9.09
|
13.70
|
22.22
|
38.46
|
66.67
|
109.89
|
185.44
|
169.42
|
163.93
|
|
10"
|
15.15
|
23.26
|
38.46
|
66.67
|
112.36
|
185.89
|
303.03
|
263.16
|
270.27
|
|
12"
|
23.81
|
28.46
|
71.43
|
117.65
|
232.56
|
333.33
|
464.55
|
434.78
|
444.44
|
|
