Butterfly Valves - Flow Coefficients Cv
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.
Valve Size | Flow Coefficient - Cv | ||||||
---|---|---|---|---|---|---|---|
Openness (disc angle) | Maximum flow velocity (ft/sec) | ||||||
inches | mm | 90 deg (wide open) | 70 deg | 50 deg | 30 deg | ANSI 150 | ANSI 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.
Control Valves for Water Flow – Kv Sizing & Pressure Drop Calculations
Control valve sizing and pressure drop calculations for water flow applications. Different valve types, Kv flow coefficients, and how to select the right 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.
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.
Weir Diaphragm Valves - Flow Coefficients and Flow Factors
Typical flow coefficients - Cv - and flow factors - Kv - for weir diaphragm valves.