Modulating Control Valves

Reduced trims are not available for Nil-Cor butterfly control valves, as is generally the case with all butterfly valve manufacturers. The Nil-Cor butterfly valve flow characteristic is modified equal percentage. Actual values are shown in the table below:

Butterfly Valve CV vs. Degrees Open
 
Size 20 30 40 50 60 70 80 90
3" 9 21 37 58 90 125 163 202 220
4" 16 38 67 105 162 225 292 363 395
6" 38 87 156 250 387 570 701 873 950
8" 75 155 260 445 705 1085 1505 1885 2250
10" 130 255 435 730 1145 1750 2440 2095 3640
12" 180 365 620 1035 1630 2485 3470 4400 5180
Butterfly Valve Recovery Characteristic, FL and Cavitation Index, KC
   
Deg. Open 10 20 30 60 90
FL 0.90 0.90 .084 0.73 0.62
KC 0.39 0.39 0.39 0.36 0.33

For more information on Nil-Cor Control Valves, contact your nearest Nil-Cor Representative or visit our contact page.