Which block to be used in Simulink for a component with Cv (flow Co-efficient) value in determining pressure loss of a system..???

I need to calculate pressure loss of valves with known Cv placed in a circuit. Please sugggest as which block shall exactly be applied. I tried usig linear resistance block but the output seems to differ. Also I tried using flow co-efficient parameterized (TL) using interface (TL-IL) even then the output do not match with the manual calculation.

Thanks & Regards,

Karthick. S