Ball Valve Flow Coefficients - Cv

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

A conventional ball valve is normally not used as a throttling valve since a partial flow will create high velocity flow tear at the ball and the seal.

Full Bore Valves

Typical flow coefficients - Cv - for full bore valves:

Valve Size
inches1/23/411
1/2
22
1/2
34681012141618
mm12192537.55062.575100150200250300350400450
Flow Coefficient
C
v
26 50 94 260 480 750 1300 2300 5400 10000 16000 24000 31400 43000 57000

Reduced Bore Valves

Typical flow coefficients - Cv - for reduced bore valves:

Valve Size
inches3468101214161820
mm75100150200250300350400450500
Flow Coefficient
C
v
420 770 1800 2500 4500 8000 12000 14000 18000 22000

These values are suitable for estimates only. Since the bore in valves varies the valve manufacturer should always be consulted for the actual Cv for the valve selected.

Related Topics

  • Piping Systems - Dimensions of pipes and tubes, materials and capacities, pressure drop calculations and charts, insulation and heat loss diagrams
  • Control Valves - Control Valve terminology, bodies, trim, flow characteristics, Cv and Kv sizing, noise, actuators and positioners

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