Title: +135.01=370.002-LC001T_04-SkyStar_UK_cat_99A4790100_Rev_N_02_17_s.pdf
The minimum differential pressure “p1” – ”p3”, required to guarantee the correct value of the set water flow rate, is indicated in the diagrams on page 17. This is an essential factor to size the system pressure drop and pump pressure head. The flow rate is kept at a constant value only if the valve pressure drop is higher than the indicated value.Minimum operating differential pressureThe minimum differential pressure and the balancing valve pressure drop must be considered to size the system pumps. Flow rate is constant if the pressure drop is higher than that indicated in the diagrams on page 17. The following diagram shows an example of the flow rate trend according to the pressure drop and calibration required.Example DN 15 ModelLEGEND:Qw = Water flow rate (l/h)Pd = Min. differential pressure “p1” – ”p3” (bar)Q1 = Area with inconstant water flowQ2 = Area with constant water flowS1 = Position of the adjustment valveplungerM1 = Position of the knob16AccessoriesSkyStar