Diaphragm
Pumps
Use a positive displacement
design rather than
centrifugal force to move
water through the casing.
This means that the pump
will deliver a specific
amount of flow per stroke,
revolution or cycle.

Engine-powered versions
are the most common and
typically use the drive shaft
to turn an offset connecting
rod that is coupled to a
flexible diaphragm. The
connecting rod alternately
raises (expands) and
lowers (contracts) the
diaphragm at a rate of 60
cycles per minute (rpm).

A vacuum is created inside
the pump casing each time
the diaphragm is raised
(suction stroke). This
opens the inlet valve and
seals the discharge valve
allowing water and air to enter the pump. When the diaphragm is lowered the resulting
pressure seals the inlet and opens the outlet valve purging the pump housing of water
and air (discharge stroke). Unlike centrifugal designs the water inside the casing is
positively displaced and no re-circulation occurs.

Diaphragm Pumps have long been a favorite of the rental industry, they deliver dependable performance and low maintenance in an economical package. They are ideal for the slow seepage applications where a centrifugal pump would ordinarily lose its prime. They are perfect for muddy water, sludge or any water with a high percentage of solids.