Flow data

The purpose of a butterfly valve as a regulator is to correct a flow process by changing the resistance with different valve settings.

The unit used is the KV value which can be defined as follows:

The KV value equals the total volume of water at 20°C that will pass through the valve in one hour at a differential pressure of 1 bar, measured in m3/hr.

Q = Flow [m3/hr]
ρ = Specific gravity [kg/m3]
ρ 0 = Specific gravity of water under normal conditions ( ρ 0= 1000kg/m3 at 288K)
P1 = Inlet pressure [bar]
P2 = Outlet pressure [bar]
G = Relative specific gravity in relation to air (G =ρ/ ρ air) under normal conditions
Ti = Inlet temperature [K]

KV VALUES TABLE BONDED LINER VALVES
  10° 20° 30° 40° 50° 60° 70° 80° 90°
DN 40 0 0,2 0,6 2 9 22 36 56 81 110
DN 50 0 0,4 0,9 3,4 14 35 57 88 126 172
DN65 0 0,6 1,4 5,1 21 53 86 132 189 258
DN80 0 1 1,9 7,8 31 78 128 197 283 388
DN100 0 1,7 3,5 14 55 138 228 352 504 690
DN125 0 2,7 5,3 22 86 216 355 549 786 1078
DN150 0 3,9 7,8 31 124 310 512 791 1133 1552
DN200 0 6,9 14 55 221 552 918 1407 2014 2759
DN250 0 10 22 86 345 862 1422 2198 3147 4310
DN300 0 15 31 124 497 1241 2048 3166 4531 6207
DN350 0 21 42 151 676 1513 2496 3858 5522 7565
DN400 0 27 55 200 883 2004 3307 5110 7316 10022
DN450 0 35 70 256 1117 2565 4231 6540 9360 12823
DN500 0 43 86 319 1379 3194 5270 8144 11658 15970
DN600 0 62 124 466 1986 4660 7688 11881 17054 23297
DN700 0 79 157 891 2528 6321 10429 16118 23071 31605
DN800 0 96 194 774 3096 7740 12771 19737 28251 38700
DN900 0 129 259 1038 4828 10380 17127 26469 37844 51901
DN1000 0 161 324 1295 5179 12948 21365 33018 47261 64742

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