Water Control Valves - Calculating Kv Values
Design of water process control valves and their Kv values
The table below can be used to estimate the Kv values for process control valves used in water systems.
- Go to the left column and select the pressure drop for the valve
- Go right in table close to the actual water flow. Interpolate to find the approximately Kv value
For full table - rotate the screen!
Kv | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Pressure drop | Water flow (kg/h) | |||||||||||
36 | 72 | 108 | 144 | 180 | 360 | 720 | 1080 | 1440 | 1800 | 3600 | ||
(kPa) | (bar) | Water flow (kg/s) | ||||||||||
0.01 | 0.02 | 0.03 | 0.04 | 0.05 | 0.1 | 0.2 | 0.3 | 0.4 | 0.5 | 1 | ||
1 | 0.01 | 0.36 | 0.72 | 1.1 | 1.4 | 1.8 | 3.6 | 7.2 | 10.8 | 14.4 | 18.0 | 36.0 |
2 | 0.02 | 0.25 | 0.51 | 0.76 | 1.0 | 1.3 | 2.6 | 5.1 | 7.6 | 10.2 | 12.7 | 25.5 |
3 | 0.03 | 0.21 | 0.42 | 0.62 | 0.83 | 1.0 | 2.1 | 4.2 | 6.2 | 8.3 | 10.4 | 20.8 |
4 | 0.04 | 0.18 | 0.36 | 0.54 | 0.72 | 0.90 | 1.8 | 3.6 | 5.4 | 7.2 | 9.0 | 18.0 |
5 | 0.05 | 0.16 | 0.32 | 0.48 | 0.64 | 0.80 | 1.6 | 3.2 | 4.8 | 6.4 | 8.1 | 16.1 |
10 | 0.1 | 0.11 | 0.23 | 0.34 | 0.46 | 0.57 | 1.1 | 2.3 | 3.4 | 4.6 | 5.7 | 11.4 |
20 | 0.2 | 0.08 | 0.16 | 0.24 | 0.32 | 0.40 | 0.80 | 1.6 | 2.4 | 3.2 | 4.0 | 8.1 |
30 | 0.3 | 0.07 | 0.13 | 0.2 | 0.26 | 0.33 | 0.66 | 1.3 | 2.0 | 2.6 | 3.3 | 6.6 |
40 | 0.4 | 0.06 | 0.11 | 0.17 | 0.23 | 0.28 | 0.57 | 1.1 | 1.7 | 2.3 | 2.9 | 5.7 |
50 | 0.5 | 0.05 | 0.10 | 0.15 | 0.20 | 0.25 | 0.51 | 1.0 | 1.5 | 2.0 | 2.6 | 5.1 |
100 | 1 | 0.04 | 0.07 | 0.11 | 0.14 | 0.18 | 0.36 | 0.72 | 1.1 | 1.4 | 1.8 | 3.6 |
200 | 2 | 0.03 | 0.05 | 0.08 | 0.10 | 0.13 | 0.25 | 0.51 | 0.76 | 1.0 | 1.3 | 2.6 |
300 | 3 | 0.02 | 0.04 | 0.06 | 0.08 | 0.10 | 0.21 | 0.42 | 0.62 | 0.83 | 1.0 | 2.1 |
400 | 4 | 0.02 | 0.04 | 0.05 | 0.07 | 0.09 | 0.18 | 0.36 | 0.54 | 0.72 | 0.9 | 1.8 |
500 | 5 | 0.02 | 0.03 | 0.05 | 0.06 | 0.08 | 0.16 | 0.32 | 0.48 | 0.64 | 0.8 | 1.6 |
1000 | 10 | 0.01 | 0.02 | 0.03 | 0.05 | 0.06 | 0.11 | 0.23 | 0.34 | 0.46 | 0.57 | 1.1 |
2000 | 20 | 0.01 | 0.02 | 0.02 | 0.03 | 0.04 | 0.08 | 0.16 | 0.24 | 0.32 | 0.40 | 0.80 |
3000 | 30 | 0.01 | 0.01 | 0.02 | 0.03 | 0.03 | 0.07 | 0.13 | 0.20 | 0.26 | 0.33 | 0.66 |
4000 | 40 | 0.01 | 0.01 | 0.02 | 0.02 | 0.03 | 0.06 | 0.11 | 0.17 | 0.23 | 0.28 | 0.57 |
For full table - rotate the screen!
Kv | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Pressure drop | Water flow (kg/h) | |||||||||||
7200 | 10800 | 14400 | 18000 | 36000 | 72000 | 108000 | 144000 | 180000 | 360000 | 720000 | ||
(kPa) | (bar) | Water flow (kg/s) | ||||||||||
2 | 3 | 4 | 5 | 10 | 20 | 30 | 40 | 50 | 100 | 200 | ||
1 | 0.01 | 72.0 | 108 | 144 | 180 | 360 | 720 | 1080 | 1440 | 1800 | 3600 | 7200 |
2 | 0.02 | 50.9 | 76.4 | 102 | 127 | 254 | 509 | 763 | 1019 | 1273 | 2546 | 5091 |
3 | 0.03 | 41.6 | 62.4 | 83.1 | 103 | 207 | 415 | 623 | 831 | 1039 | 2078 | 4157 |
4 | 0.04 | 36.0 | 54.0 | 72.0 | 90.0 | 180 | 360 | 540 | 720 | 900 | 1800 | 3600 |
5 | 0.05 | 32.2 | 48.3 | 64.4 | 80.5 | 161 | 321 | 483 | 644 | 805 | 1610 | 3220 |
10 | 0.1 | 22.8 | 34.2 | 45.5 | 56.9 | 113 | 227 | 342 | 455 | 569 | 1138 | 2277 |
20 | 0.2 | 16.1 | 24.2 | 32.2 | 40.3 | 80.5 | 161 | 242 | 322 | 402 | 805 | 1610 |
30 | 0.3 | 13.2 | 19.7 | 26.3 | 32.9 | 65.7 | 131 | 197 | 263 | 329 | 657 | 1315 |
40 | 0.4 | 11.4 | 17.1 | 22.8 | 28.5 | 56.9 | 114 | 171 | 228 | 285 | 569 | 1138 |
50 | 0.5 | 10.2 | 15.3 | 20.4 | 25.5 | 50.9 | 102 | 153 | 204 | 255 | 509 | 1018 |
100 | 1 | 7.2 | 10.8 | 14.4 | 18.0 | 36.0 | 72.0 | 108 | 144 | 180 | 360 | 720 |
200 | 2 | 5.1 | 7.6 | 10.2 | 12.7 | 25.5 | 50.9 | 76.4 | 102 | 127 | 255 | 509 |
300 | 3 | 4.2 | 6.2 | 8.3 | 10.4 | 20.8 | 41.6 | 62.4 | 83.1 | 104 | 208 | 416 |
400 | 4 | 3.6 | 5.4 | 7.2 | 9.0 | 18.0 | 36.0 | 54.0 | 72.0 | 90.0 | 180 | 360 |
500 | 5 | 3.2 | 4.8 | 6.4 | 8.1 | 16.1 | 32.2 | 48.3 | 64.4 | 80.5 | 161 | 322 |
1000 | 10 | 2.3 | 3.4 | 4.6 | 5.7 | 11.4 | 22.8 | 34.2 | 45.5 | 56.9 | 114 | 228 |
2000 | 20 | 1.6 | 2.4 | 3.2 | 4.0 | 8.1 | 16.1 | 24.2 | 32.2 | 40.3 | 80.5 | 161 |
3000 | 30 | 1.3 | 2.0 | 2.6 | 3.3 | 6.6 | 13.2 | 19.7 | 26.3 | 32.9 | 65.7 | 131 |
4000 | 40 | 1.1 | 1.7 | 2.3 | 2.9 | 5.7 | 11.4 | 17.1 | 22.8 | 28.5 | 56.9 | 114 |
Example - Kv for a Water Control Valve
For a water control valve with
- pressure drop 2 bar
- water flow 1 kg/s
- the Kv value should be approximately 2.6 according the table above.
Kv can be calculated as:
Kv = q / (dp)1/2 (1)
where
Kv = Kv value
q = water flow (m3/h)
dp = pressure drop (bar)
Related Topics
Related Documents
Tag Search
- en: water control valve process regulating