Water Control Valves - Calculating Kv Values

Design of water process control valves and their Kv values

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The table below can be used to estimate the Kv values for process control valves used in water systems.

  1. Go to the left column and select the pressure drop for the valve
  2. Go right in table close to the actual water flow. Interpolate to find the approximately Kv value
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 1.08 1.44 1.8 3.6 7.2 10.8 14.4 18 36
2 0.02 0.25 0.51 0.76 1.02 1.27 2.55 5.09 7.64 10.18 12.73 25.46
3 0.03 0.21 0.42 0.62 0.83 1.04 2.08 4.16 6.24 8.31 10.39 20.78
4 0.04 0.18 0.36 0.54 0.72 0.9 1.8 3.6 5.4 7.2 9 18
5 0.05 0.16 0.32 0.48 0.64 0.8 1.61 3.22 4.83 6.44 8.05 16.1
10 0.1 0.11 0.23 0.34 0.46 0.57 1.14 2.28 3.42 4.55 5.69 11.38
20 0.2 0.08 0.16 0.24 0.32 0.4 0.8 1.61 2.41 3.22 4.02 8.05
30 0.3 0.07 0.13 0.2 0.26 0.33 0.66 1.31 1.97 2.63 3.29 6.57
40 0.4 0.06 0.11 0.17 0.23 0.28 0.57 1.14 1.71 2.28 2.85 5.69
50 0.5 0.05 0.1 0.15 0.2 0.25 0.51 1.02 1.53 2.04 2.55 5.09
100 1 0.04 0.07 0.11 0.14 0.18 0.36 0.72 1.08 1.44 1.8 3.6
200 2 0.03 0.05 0.08 0.1 0.13 0.25 0.51 0.76 1.02 1.27 2.55
300 3 0.02 0.04 0.06 0.08 0.1 0.21 0.42 0.62 0.83 1.04 2.08
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 1.61
1000 10 0.01 0.02 0.03 0.05 0.06 0.11 0.23 0.34 0.46 0.57 1.14
2000 20 0.01 0.02 0.02 0.03 0.04 0.08 0.16 0.24 0.32 0.4 0.8
3000 30 0.01 0.01 0.02 0.03 0.03 0.07 0.13 0.2 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

 

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 72 108 144 180 360 720 1080 1440 1800 3600 7200
2 0.02 50.91 76.37 101.82 127.28 254.56 509.12 763.68 1018.23 1272.79 2545.58 5091.17
3 0.03 41.57 62.35 83.14 103.92 207.85 415.69 623.54 831.38 1039.23 2078.46 4156.92
4 0.04 36 54 72 90 180 360 540 720 900 1800 3600
5 0.05 32.2 48.3 64.4 80.5 161 321.99 482.99 643.99 804.98 1609.97 3219.94
10 0.1 22.77 34.15 45.54 56.92 113.84 227.68 341.53 455.37 569.21 1138.42 2276.84
20 0.2 16.1 24.15 32.2 40.25 80.5 161 241.5 321.99 402.49 804.98 1609.97
30 0.3 13.15 19.72 26.29 32.86 65.73 131.45 197.18 262.91 328.63 657.27 1314.53
40 0.4 11.38 17.08 22.77 28.46 56.92 113.84 170.76 227.68 284.6 569.21 1138.42
50 0.5 10.18 15.27 20.36 25.46 50.91 101.82 152.74 203.65 254.56 509.12 1018.23
100 1 7.2 10.8 14.4 18 36 72 108 144 180 360 720
200 2 5.09 7.64 10.18 12.73 25.46 50.91 76.37 101.82 127.28 254.56 509.12
300 3 4.16 6.24 8.31 10.39 20.78 41.57 62.35 83.14 103.92 207.85 415.69
400 4 3.6 5.4 7.2 9 18 36 54 72 90 180 360
500 5 3.22 4.83 6.44 8.05 16.1 32.2 48.3 64.4 80.5 161 321.99
1000 10 2.28 3.42 4.55 5.69 11.38 22.77 34.15 45.54 56.92 113.84 227.68
2000 20 1.61 2.41 3.22 4.02 8.05 16.1 24.15 32.2 40.25 80.5 161
3000 30 1.31 1.97 2.63 3.29 6.57 13.15 19.72 26.29 32.86 65.73 131.45
4000 40 1.14 1.71 2.28 2.85 5.69 11.38 17.08 22.77 28.46 56.92 113.84

Example - Kv for a Water Control Valve

With a pressure drop of 2 bar, a water flow of 1 kg/s, the Kv value should be approximately 2.55.

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Related Topics

  • Control Valves - Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators and positioners
  • Process Control - Instrumentation and process control systems - engineering and documentation
  • Water Systems - Hot and cold water systems - design properties, capacities, sizing and more

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