When these diaphragms are pushed away from (or toward) the center section, or air motor, a vacuum is created in the pump’s body, and fluid flows into one of the liquid chambers through an inlet port. When the diaphragms are subsequently pushed in the opposite direction back to their original positions, again via compressed air, the fluid is expelled from the liquid chamber via an outlet port.
This cycle repeats over and over when the pump is in operation, creating the pumping action. Specially designed check valves control the flow of the fluid in and out of the pump’s central chamber as the pump cycles, ensuring that the fluid flows in only one direction.
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