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From actual flow rate to normal flow rate

  1. Nov 23, 2013 #1
    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)


    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
    Last edited by a moderator: May 6, 2017
  2. jcsd
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