PFD - Process Flow Diagram - Engineering ToolBox A Process Flow Diagram - PFD - (or System Flow Diagram - SFD) shows the relations between major components in a system. PFD also tabulate process design values for components in different operating modes, typical minimum, normal and maximum. A PFD does not show minor components, piping systems, piping ratings and designations. A PFD should include: Related searches for engineering design process diagram the engineering processthe design processengineering design cycleengineering design process exampleve model of engineering designengineering design process definitionengineering design process for kidsthe engineering design process pdf