Recent content by MaHo12345

  1. MaHo12345

    Relationship between flow and pressure in a valve

    Sorry, let me specify: The entire setup is (from upstream to downstream): 1. Inlet at atmospheric conditions 2. Needle valve set such that the pressure is 16 mbar(abs) when proportional valve (3) is fully opened 3. Proportional valve, controlled with 0-10V DC 4. Scroll pump 5. Outlet at...
  2. MaHo12345

    Relationship between flow and pressure in a valve

    The fluid is air at room temperature. The pressure is negative (i.e. below atmosphere), that is why the scroll pump is connected downstream. As I understand, the flow decreases as the valve is closed (since it is not a hydraulic positive displacement pump with flow independent of pressure)...
  3. MaHo12345

    Relationship between flow and pressure in a valve

    Hi, I have a valve which is connected to a pipe on both sides. I measure the pressure upstream of the valve. Downstream of the valve is a screw pump. I control my valve using an analog voltage input between 0 and 10 volts. According to the datasheet, the relationship between the analog input...