# K (Pressure Loss Coefficient)

A K value is the most common way of expressing the pressure loss relationship as a function of flow. There are many types of pipe fittings that are described by K values. (see Miller [4], or Idelchik [5]). For this reason it is possible to enter any type of fitting into the FluidFlow database, but FluidFlow does not force you to work in this way as it is also possible to add/change a K value directly via the Input Editor.