# Flow Coefficient

## Definition - What does Flow Coefficient mean?

## Petropedia explains Flow Coefficient

The valve allowing fluid through it is more efficient than the one which faces problems with the flow process. The formula used to calculate the flow coefficient is:

**C _{v} = Q x (SG/DeltaP)^{1/2 }**

Where Q= rate of flow

C_{v} = Flow capacity or flow coefficient

SG = Specific gravity of fluid

Delta P = Pressure drop

Flow Coefficient (Cv) is different for gases, steam and for liquids. The flow coefficient and valve stroke relationship are known as the flow characteristics. At a certain stroke (or a percentage opening of the valve) a certain amount of fluid would be allowed to flow through it.### Related Terms

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#### Misspellings:

Flow Co-efficient, Flow-Coefficient