Figure 1: Compressed air is directed into the back of diaphragm A through a control valve, causing it to flex outward. This air-driven mechanism reduces mechanical stress compared to traditional piston systems, which helps increase the diaphragm's lifespan. As diaphragm A moves away from the central body, diaphragm B is pulled toward the center via a connecting shaft. At this point, the air behind diaphragm B is released through the outlet, creating a vacuum in chamber B. This vacuum allows fluid to enter the pump through the inlet manifold by atmospheric pressure, pushing the ball valve open and filling chamber B.
Figure 2: When diaphragm A reaches its maximum displacement, the air valve redirects the airflow to the back of diaphragm B, pushing it outward while pulling diaphragm A back toward the center. This movement causes the inlet valve ball to close and the outlet valve ball to open, allowing fluid to be expelled from the pump. As diaphragm A returns to the center, chamber A becomes evacuated, drawing in more fluid through the inlet manifold until it is fully filled due to atmospheric pressure.
Figure 3: Once the diaphragm movement cycle is complete, the air valve directs air back to the back of diaphragm A, while diaphragm B acts as an exhaust port. As the pump returns to its starting position, both diaphragms alternately discharge either air or fluid, completing a full pumping cycle. With several repeated cycles, the pump achieves self-priming capability, ensuring efficient operation even when handling viscous or difficult-to-pump fluids.
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