"Two Way" Junctions
"Two Way" Junctions can be used to simulate bends, elbows or any other objects with fixed K factor (or equivalent length). R/D represents the radius of the curve divided by the diameter of the curve. The ratio and angle are not necessary for the simulation. Junctions can be selected from the presets or entered as a custom value.
Fig. 3.2.4.1: The two-way junction addition box.
"Three and Four Way" Junctions
"Three and Four Way" Junctions are simulated from two values, one for the flow through the junction and one for the flow of the branch. For "Tee" and "Wye" pieces, Pumpsim™ uses the drawing to determine if it is a flow-through or branch flow. Junctions can be selected from the preset or entered as a custom value.
Fig. 3.2.4.2: The three and four-way junction addition box.
Diameter change
The resistance of the junction is automatically calculated from the angle and the two diameters. Pumpsim™ compares the two pipe diameters to determine if it is a contraction or expansion. The K factor for contraction and expansion is automatically calculated from the two diameters and the angle. They can be created as custom values.
Fig. 3.2.4.3: The K factor (whether contraction of expansion) is calculated from the values inputted into the junction creation box.