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  1. justitia

    Cv blowdown valve

    Thanks gerhardl, so I can rely on the tables of manufacturers according to the scale and pressure of the boiler indicates the orifice? But no account of the pressure drop .. Thanks
  2. justitia

    Cv blowdown valve

    Hello everyone I have to calculate the required Cv for a blowdown valve. The fluid is boiler feed water. I know the mass flow, pressure and temperature input and output, corresponding to saturated steam (eg 50 bar, 263 ° C). What formula should I use? Liquid or dry saturated steam? Thanks
  3. justitia

    Nozzle check valve

    Thanks btrueblood, I am the manufacturer, but it is the first time that I deal with this type of valve :(
  4. justitia

    Nozzle check valve

    Hello everyone. for the design of some nozzle check valve I have the following conditions: - Mass flow rate max - Mass flow rate min - Upstream pressure - Density It is required that those conditions the valve allowing all the mass flow rate and that the valve disc does not vibrate on the...
  5. justitia

    Cv and mass flow rate

    Grazie for reply gerhardl therefore without knowing the mass flow not I continue? not I do assumptions and then verify? For example, I think, take the exit Mach numbers less than a certain value.
  6. justitia

    Cv and mass flow rate

    Hello everyone. I fill the data sheet for a choke valve. I know the fluid (gas) and the pressures of inlet and outlet. I have to give CV values required and the mass flow rate. For example: p1 = 234 barg, p2 = 1 barg, temperature = 20 ° C, Density @ T1, p1 = 202 kg/m3, molecular weight =...
  7. justitia

    CV request choke valve

    Thank you all for the answers Another question on this topic. I have to calculate the noise with IEC 60534-8-3. My problem is the jet diameter Dj. If I have a cage with holes calculated as per the rules: I find Fd, valve style, with the formula dh/d0, knowing the number and size of holes? If...
  8. justitia

    CV request choke valve

    Hello at everyone, I must to design a multiple orifice choke valve. I have the following data at the maximum: flow: 13500 MMSCFD Inlet pressure: 1300 psig Temperature: 200°F Outlet pressure: 300 psig Specific Gravity: 0,683 State of fluid: Vapor How do I calculate the Cv request? I tried in...
  9. justitia

    CV control valve

    Hello, How can I figure out the flow coefficient CV under certain conditions? The fluid is a gas. Data available are: mass flowrate, inlet pressure, pressure drop, inlet temperature, vapour molecular weight, compressibility factor, viscosity at inlet temperature and specific heat ratio. I...

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