All-Flo Pumps is a leading manufacturer of Air Operated Double Diaphragm pumps and fluid handling solutions and are made from the widest range of metallic and plastic materials.
HOW AN AIR OPERATED DOUBLE DIAPHRAGM PUMP WORKS
The air-valve uses pressurized air to move the diaphragm on the left outwardly. The left diaphragm and right diaphragm are connected by a diaphragm rod. When the left diaphragm moves to the right it causes the right diaphragm to also move to the right.
When the diaphragm on the left side moves to the right, it is referred to as the suction stroke. When in its suction stroke it causes the left suction ball to move upward opening and the left discharge ball to move downward closing. This creates suction in the left chamber pulling in liquid.
When the diaphragm on the left side moves to the left, it is referred to as the discharge stroke. When in its discharge stroke stroke it causes the left suction ball to move downward closing and the left discharge ball to move upward opening. This causes the liquid to leave the left side of the pump.
While this process is happening on the left side the opposite stroke is happening with the right diaphragm. This alternates the suction / discharge strokes back and forth between the sides as long as compressed air is being supplied to the system.