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

# Butterfly Valves - Flow Coefficients Cv

## Typical flow coefficients - Cv - for butterfly valves.

The table below can be used to indicate butterfly valves and their flow coefficients at different open (or closed) positions. Manufacturers data should always be checked before actual use.

Butterfly Valves - Flow Coefficients
Valve SizeFlow Coefficient - Cv
Openness
(disc angle)
Maximum flow velocity
(ft/sec)
inchesmm90 deg
(wide open)
70 deg50 deg30 degANSI 150ANSI 300
2 50 85 65 35 15 90 90
2 1/2 65 160 120 65 29 80 90
3 80 260 195 104 47 80 80
4 100 475 356 190 86 80 80
5 125 770 577 308 139 80 80
6 150 1125 844 450 203 75 80
8 200 2110 1583 844 380 70 75
10 250 3350 2513 1340 603 60 70
12 300 4800 3600 1920 864 50 60
14 350 6900 5175 2760 1224 50
16 400 9000 6750 3600 1620 50
18 450 11800 8850 4720 2124 50
20 500 14300 10725 5720 2574 50
• 1 ft/s = 0.3048 m/s

## Related Topics

• ### Control Valve Sizing

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

Calculate dimensions of pipes and tubes. Pressure drop calculations and head loss charts. Use of different piping materials. Insulation of pipes and tubes and heat loss diagrams.

## Related Documents

• ### Ball Valves - Flow Coefficients Cv

Flow coefficients - Cv - for typical ball valves - reduced and full bore.
• ### Control Valves - Adding Flow Coefficients for Valves in Series or Parallel

How to add flow coefficients for control valves in series or parallel.
• ### 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.
• ### Straight Through Diaphragm Valves - Flow Coefficients

Flow coefficients - Cv - and flow factors - Kv - for straight through diaphragm valves.
• ### Water Control Valves - Flow Coefficient Cv Diagram

Sizing of water control valves - Imperial units.
• ### Water Control Valves - Kv Calculation

Designing water process control valves and their Kv values.
• ### Weir Diaphragm Valves - Flow Coefficients and Flow Factors

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

## Search

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

## 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 older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .

## Citation

• The Engineering ToolBox (2003). Butterfly Valves - Flow Coefficients Cv. [online] Available at: https://www.engineeringtoolbox.com/butterfly-valves-flow-coefficients-d_224.html [Accessed Day Month Year].

Modify the access date according your visit.

7.8.15

.