The Gustaf Fagerberg calculating tool offers afast and easy way to estimate kv-values for control valves.There are calculations for three different common medias: Water,saturated steam and air. By putting in the flow rate, up- anddownstream pressure and temperature (for water and air), theprogram estimates the kv-value.The kv-estimation is a useful guide line which gives an idea of thecorrect valve type and –size, and/or to determine if an installedvalve has the required capacity.The results are calculated from basic and commonly known formulasfor water, saturated steam and air, the two latter both withcritical and non critical pressure drop,Note the calculations are basic and the results shall only be usedas guide lines.The flow rate is for water entered in m/h or kg/h, for saturatedsteam in kg/h and for air in Nm³/h. The unit for up- and downstreampressure is bar a, and for temperature °C.Enjoy!