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Figure 1: The air distribution system directs the air supply to
the right air chamber and therefore, the back side of
diaphragm A. The compressed air moves diaphragm A away
from the center block towards the liquid chamber. The
opposite diaphragm (diaphragm B) is pulled in by the shaft
connected to the pressurized diaphragm (diaphragm A).
Diaphragm B is now on its suction stroke; air behind the
diaphragm has been forced out to atmosphere through the
exhaust port of the pump. Diaphragm A is currently working
against atmospheric air pressure. The movement of
diaphragm B towards the center block of the pump creates a
vacuum within liquid chamber B. Atmospheric pressure forces
fluid into the inlet manifold forcing the inlet valve ball off its
seat. Liquid is now free to move past the inlet valve ball
(lower left) and fill the liquid chamber.
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Figure 2: When the pressurized diaphragm (diaphragm A)
reaches the limit of its discharge stroke, the air valve
"#e0386c" face="comic sans ms"irects the compressed air supply to the back side of
diaphragm B. The pressurized air forces diaphragm B away
from the center block while the shaft pulls diaphragm A
toward the center block. The air chamber on side A
exhausts its air to atmosphere through the exhaust port of
the pump. Diaphragm B is now on its discharge stroke while
diaphragm A is on its suction stroke. Diaphragm B forces the
inlet valve ball (lower left) onto its seat due to the hydraulic
forces developed in the liquid chamber and manifold of the
pump.
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Figure 3:These same hydraulic forces lift the discharge valve
ball off its seat while the opposite discharge valve ball is
forced onto its seat, forcing fluid to flow through the left
side of the pump and out the discharge manifold. The
movement of diaphragm A to the center block of the pump
creates a vacuum within liquid chamber A. Atmospheric
pressure forces fluid into the inlet manifold of the pump. The
inlet valve ball is forced off its seat allowing the fluid to
enter the right liquid chamber.
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