Valve Sizing

Calculate the flow coefficient (Cv or Kv) for a valve in a liquid application

Calculator

unitless

Governing Equation

This calculator helps select a valve for a flow application. If sized too small, the desired flow rate will not be acchieved. If sized too large, the flow control will be difficult.

The valve flow coefficient (Cv) is a convenient way to represent flow capacity of a valve

Q=Cv∗ΔPgQ = C_v * \sqrt{\frac{\Delta P}{g}}

This equation is only applicable for liquids

Definitions

Q=Q =
Fluid volumentric flow rate
Cv=C_{v} =
Flow coefficient
ΔP=\Delta P =
Pressure drop across the valve
g=g =
Gravitational constant