Hi all, I have developed a simscape model of a pressure regulator valve and I derive valve parameters from the valve datasheet. From the datasheet I get the following valve flow characteristic: http://imagizer.imageshack.us/v2/150x100q90/c/707/3emx.jpg [Broken] The flow rate is in normal liters, instead from simscape I get the actual flow rate, therefore I need to convert it. I found the following approximate formula to compute the normal flow rate from the actual one: Qn = Qa x (Pa/Pn) x (Tn/Ta) Where: Qn is the normal flow rate Pn is the pressure at the normal condition 1 atm Tn is the temperature at the normal condition 293.15 K Qa is the actual flow rate Pa is the actual pressure Ta is the actual temperature Is it correct? In my case there is a valve where at the inlet there are 4bar and at the outlet there is 1 bar, so which pressure should I use for the computation of the normal flow rate? Hopefully I have well explained my problem Thanks.