ALF-13131-E-02
All-Flo
6
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 diaphragm (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 suction stroke. When the left diaphragm is in its suction stroke,
the left suction valve moves upward (opens) and the left discharge valve
moves downward (closes). This action creates suction and draws liquid
into the left side chamber.
The air-valve directs pressurized air behind the left diaphragm, causing
the left diaphragm to move outward (to the left).
Since both the left diaphragm and the right diaphragm are connected
via a diaphragm 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 valve
opens and the left suction valve 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 valve to open and the right discharge to close,
which in turn causes suction, 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.
Note: The graphics show ball valves, which are replaced with Max-Pass™
valves for these pump models.
HOW AN AIR OPERATED DOUBLE
DIAPHRAGM PUMP WORKS
3
SECTION
