Air Valve Sizing Calculator Available Air Pressure: PSI Cylinder Bore: Inches Stroke Length: Stroke Inches Time for Stroke: Seconds Number of Cylinders: Volume Required: Cubic Inches Cubic Feet per Minute: Coefficient of Flow: CFM Cv (with 2 psi pressure drop) Cv (with 5 psi pressure drop) Cv (with 10 psi pressure drop)