You can associate a flow arrow with a length of pipe or with a component and as a “sense” of direction. When you place a flow arrow into a sketch, you use the Properties window to define its direction initially or modify its direction later.
Click Place > Flow Arrow.
In the Detail window, click the point on a section of pipe or component at which to position the flow arrow.
The software places the flow arrow and displays the Dimension box.
Type value in the dimension box, and then press ENTER.
Select the flow arrow symbol in the pipeline. In the Properties window, use the Flow Direction list to define the flow direction.
The software uses the icon to represent the flow arrow in the Pipeline Explorer.