FL
	The FL, Liquid Pressure Recovery Coefficient, is a dimensionless constant used to calculate the pressure drop when the valve's liquid flow is choked. The FL is the square root of the ratio of valve pressure drop to the pressure drop from the inlet pressure to the pressure of the vena contracta. The FL factor is an indication of the valve's vena contracta pressure relative to the outlet pressure. As the FL value becomes smaller the vena contracta pressure becomes increasingly lower than the valve's outlet pressure and the valve is more likely to cavitate. If the Rated FL is less than the Required FL, the liquid flow will be choked with cavitation.