Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Search is the most efficient way to navigate the Engineering ToolBox!

Water Control Valves - Kv Calculation

Sponsored Links

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

For full table - rotate the screen!

Water Control Valves - Kv Values vs. Water Flow and Pressure Drop
Pressure dropWater flow (kg/h)
36721081441803607201080144018003600
(kPa)(bar)

Water flow (kg/s)
0.010.020.030.040.050.10.20.30.40.51
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!

Water Control Valves - Kv Values vs. Water Flow and Pressure Drop
Pressure dropWater flow (kg/h)
72001080014400180003600072000108000144000180000360000720000
(kPa)(bar)

Water flow (kg/s)
23451020304050100200
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)

Sponsored Links

Related Topics

• Control Valve Sizing

Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators, positioners and more.

• Process Control Systems

Instrumentation, design and documentation of process control systems.

• Water Systems

Design of hot and cold water service and utility systems with properties, capacities, sizing of pipe lines and more.

Related Documents

Ball Valves - Flow Coefficients Cv

Flow coefficients - Cv - for typical ball valves - reduced and full bore.

Butterfly Valves - Flow Coefficients Cv

Typical flow coefficients - Cv - for butterfly valves.

Control Valves - Adding Flow Coefficients for Valves in Series or Parallel

How to add flow coefficients for control valves in series or parallel.

Control Valves - Leakage Classification

Seat leakage classification through control valves.

Flow Coefficient Cv vs. Flow Factor Kv

Comparing flow coefficients Cv to flow factors Kv.

Liquid, Steam and Gas - Flow Coefficients Cv

Calculate flow coefficients for the design of control valves - Imperial units.

Liquid, Steam and Gas - Flow Factor Kv

Calculate flow factor Kv for liquids, steam and gases - metric units.

Process Controllers - P, PI & PID

Proportional, integrating and derivative process controllers.

Straight Through Diaphragm Valves - Flow Coefficients

Flow coefficients - Cv - and flow factors - Kv - for straight through diaphragm valves.

Valve Authority

The valve authority expresses the ratio between pressure drop across the control valve compared to total pressure drop across the whole system.

Water Control Valves - Flow Factor Kv Diagram

Sizing of water control valves - SI units

Water Control Valves - Flow Coefficient Cv Diagram

Sizing of water control valves - Imperial units.

Weir Diaphragm Valves - Flow Coefficients and Flow Factors

Typical flow coefficients - Cv - and flow factors - Kv - for weir diaphragm valves.

Sponsored Links

Search Engineering ToolBox

Search is the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics on the AMP pages. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.