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Ball Valves - 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:

For full table - rotate the screen!

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:

For full table - rotate the screen!

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.

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