Physics

Cv Flow Calculator (Valve Flow Coefficient)

Find liquid flow through a valve from its Cv and pressure drop.

Calculated Output

Flow rate (GPM) 22.361

Formula: Q = Cv·√(ΔP ÷ SG)

Step-by-Step Breakdown

1. Values used:

2. Valve Cv = 10

3. Pressure drop = 5 psi

4. Specific gravity = 1

6. Flow rate = 22.361GPM

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The math behind it

Q (GPM) = Cv·√(ΔP/SG), where ΔP is in psi. Cv is the flow of water at 1 psi drop.

Cv = 10, ΔP = 5 psi, water → about 22.4 GPM.

What does Cv = 1 mean?

1 GPM of water flows with a 1 psi pressure drop.