Use EdrawMax or EdrawMax Online to create the air supply pump process diagram for your project and to understand how the air supply pump works. Air Supply Pump Process Diagram shows Instrument Air Supply (ISA), From Transfer Pump and how they process it to the mixer that goes to the reactor, i.e., R-102. As shown in the air supply pump process diagram template, the inlet and the outlet are used to direct the airflow, while the piston is used to generate airflow. When the piston is pulled up, the air gets sucked into the pump through the inlet. And when the piston is forced down, the air becomes compressed and closes the inlet. A process diagram consists of activities, events, and gateways, which a sequence flow puts in a flow sequence. The below air supply pump diagram, activities, events, and gateways are summarized under the term flow object.