Principles of Operation
The air-valve directs pressurized air behind the diaphragm on the right, causing the
diaphragm on the right to move outward (to the right).
Since both the right diaphragm and the left diaphragm are connected
via a diaphragm rod, when the right diaphragm moves to the right, the left dia-
phragm (through the action of the diaphragm rod) moves to the right also.
When the diaphragm on the left side is moving to the right, it is referred to as suc-
tion stroke. When the left diaphragm is in its suction stroke,
the left suction ball moves upward (opens) and the left discharge ball moves down-
ward (closes). This action creates suction and draws liquid into the left side cham-
ber.
The air-valve directs pressurized air behind the left diaphragm, causing the left dia-
phragm to move outward (to the left).
Since both the left diaphragm and the right diaphragm are connected via a dia-
phragm rod, when the left diaphragm moves to the left, the right diaphragm
(through the action of the diaphragm rod) moves to the left also.
When the diaphragm on the left side moves outward, the left discharge ball moves
upward (opens) and the left suction ball moves downward (closes). This causes the
liquid to leave the left side liquid outlet of the pump.
Simultaneously, the right diaphragm moves inward (to the left), which causes the
right suction ball to open and the right discharge to close, which in turn causes suc-
tion, drawing liquid into the right chamber.
The process of alternating right suction / left discharge (and vice-versa) continues
as long as compressed air is supplied to the pump.
How an Air Operated Double Diaphragm Pump Works
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Operation & Maint
enance Ins
tructions
AODD: 2” Air Operat
ed Double Diaphragm Pum
p
