Center Line® Resilient Seated Butterfly Valves

 

Operating Torques


Center Line Resilient Seated Butterfly Valves
Series 200
Series 225-250
Series 700

Series 200

Valve Seating Torques (In-Lbs.) 2" to 30"
Valve Size Standard Disc Differential Pressure Undercut Differential Pressure
50 PSI ΔP Bushing 100 PSI ΔP Bushing 150 PSI ΔP Bushing 200 PSI ΔP Bushing 75 PSI ΔP Bushing
Bronze PTFE Bronze PTFE Bronze PTFE Bronze PTFE Bronze PTFE
2" 106 100 117 106 129 111 140 117 - -
2 ½" 152 150 166 163 181 176 195 189 - -
3" 213 207 230 220 248 232 265 244 - -
4" 321 290 386 323 450 357 515 390 - -
5" 481 423 598 481 715 540 832 598 - -
6" 692 599 878 691 1,063 783 1,248 875 - -
8" 1,326 1,060 1,716 1,183 2,106 1,307 2,496 1,430 1,124 819
10" 2,239 1,671 3,010 1,872 3,780 2,074 4,550 2,275 1,363 909
12" 3,959 2,568 4,953 2,795 5,948 3,023 6,942 3,250 2,457 1,445
14" 4,881 2,640 6,226 3,070 7,570 3,500 - - 4,400 2,300
16" 7,020 4,260 8,580 4,880 10,140 5,500 - - 5,900 3,600
18" 10,105 6,287 12,202 7,243 14,300 8,200 - - 8,300 5,500
20" 13,923 8,360 16,582 9,180 19,240 10,000 - - 11,100 6,700
24" 23,617 15,427 26,953 16,813 30,290 18,200 - - 17,300 12,100
30" 39,721 27,313 43,391 29,407 47,060 31,500 - - 27,300 21,100

Valve Seating Torques (In-Lbs.) 28" to 48" Double Flanged
Valve Size Standard Disc Differential Pressure
50 PSI Wet 100 PSI Wet 150 PSI Wet
28" 23,718 26,639 28,957
30" 28,320 30,860 33,338
32" 32,418 35,073 38,126
36" 40,622 43,480 46,524
40" 68,924 74,048 78,995
42" 69,747 74,632 79,862
48" 96,598 103,837 111,112


All torques shown in these charts were derived from test data sing water at 60°F. For torques using dry gases, multiply these numbers by 2.0. For torques involving other media, lease consult the factory.


There is no safety factor included in the numbers shown on hese charts. For actuator sizing, Crane recommends that these values be multiplied by 1.2 for single valve applications, or 2.0 for 3-way (“tee”) applications.


For PTFE/Buna seats multiply the numbers shown by 2.0.


Under certain conditions, hydrodynamic torque can meet or exceed seating and unseating torques. When designing valve systems, hydrodynamic torque must be considered to help assure correct selection for the application.


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Series 225-250

Valve Seating Torques (In.-Lbs.)
Valve Size Standard Disc Differential Pressure
50 PSI 100 PSI 150 PSI 200 PSI 285 PSI
2" 136 142 148 154 164
2 ½" 152 160 168 176 189
3" 224 229 234 239 247
4" 380 392 404 416 436
5" 451 477 503 529 572
6" 875 946 1016 1087 1206
8" 1476 1559 1642 1726 1867
10" 2451 2613 2775 2937 3213
12" 3900 4111 4323 4534 4893
14" 5189 5467 5744 6022 6494
16" 10,985 11,569 12,154 12,738 13,732
18" 13,946 14,688 15,431 16,173 17,434
20" 14,695 15,478 16,260 17,043 18,373
24" 29,738 31,321 32,903 34,486 37,176

Note:

All torques shown on the chart were derived from test data using water at 60°F. For torques using dry gases, multiply these numbers by 2.0. For torques involving other media, please consult the factory.

There is no safety factor included in the numbers shown on this chart. For actuator sizing, Center Line recommends that these values be multiplied by 1.2 for single valve applications, or 2.0 for 3-way (“tee”) applications.

For PTFE seats multiply the numbers shown on this chart by 2.0.

Under certain conditions, hydrodynamic torque can meet or exceed seating and unseating torques. When designing valve systems, hydrodynamic torque must be considered to help assure correct selection for the application.


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Series 700

Expected Seat/Unseat Torque
in/lbs 1 1.5 2 2.5 3 4 5 6 8 10 12
Dry 180 240 300 360 420 630 855 1185 1980 3045 4095
Lubricated 90 120 150 180 210 315 429.6 594 990 1524 2052


Crane recommends a safety factor of 1.25 be used for sizing of single valve applications.


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