All-Flo Pump Co. demonstrates briefly how a diaphragm pump works. This includes an indepth explanation and description of each part and its usage. This is done using the All-Flo A-200.

A diaphragm pump is a type of positive displacement pump that uses two diaphragms, which move back and forth, to move fluid. While one side is filled with water, the other is filled with air - these two phases are refered to as "suction mode" and "discharge mode". During suction mode, one diaphragm moves towards the center of the machine. The check ball closest to the inlet valve is drawn towards the diaphragm, allowing fluid to pass into the diaphragm. At the same time, the check ball closest to the discharge valve is pressed up against a seal, closing it. This allows the diaphragm to fill with fluid. During discharge mode, the diaphragm is filled with air, which pushes it up and forces fluid out. The outward force of the fluid opens the check ball near the discharge valve and closes the check ball near the suction valve. This allows fluid to exit the discharge valve.

For a more detailed explanation of diaphragm pumps, click here.