Valve Cv/Kv Flow Coefficient Calculator

📋 Sizing Parameters

Units: SI Metric (m³, bar, °C)

Pressure Basis

Flow Rate (Q)

Upstream Pressure ($P_1$)

Downstream Pressure ($P_2$)

Inlet Temperature ($T_1$)

Specific Gravity (SG)

Vapor Pressure ($P_v$)

Use water $P_v$ at $T_1$

Kinematic Viscosity (Optional)

cSt

Pressure Recovery Factor ($F_L$)

Piping Geometry Factor ($F_p$) Fp = 1.0 represents standard line-sized installation (no reducers).

Flow Coef (Cv) — Imperial units (gpm/psi^0.5)

Flow Coef (Kv) — Metric units (m³/h/bar^0.5)

Applied Pressure Drop ($\Delta P$): —

0 Choked Limit Max

The pressure drop across the valve is below the critical threshold. Flow is fully subcritical and stable.

Nominal Size (NPS)	Max Flow Coef (Cv)	Operating Load (%)