Corrosion and abrasion can damage the internal surfaces of your pump and reduce its lifespan. AODD pumps offer low shear and are suitable for shear sensitive products, including foods, Latex, and inks.
AODD pumps operate at lower speeds and transfer less shear
energy to the fluid than centrifugal air pumps. This makes them safe to use
within ATEX environments.
Double Diaphragm Pumps
MSW Pumps, also known
as Air Operated Double Diaphragm (AODD) pumps are commonly used for the
efficient transfer of industrial liquids, solid laden fluids and slurries. They
can be found in a wide range of industries, such as automotive production,
chemical processing, pharmaceutical manufacturing, and wastewater treatment.
The basic genius behind these pumps is their simplicity,
with only two wetted parts that are dynamic – the diaphragms and the valve
balls, which direct fluid flow. Driving these diaphragms with compressed air
instead of mechanical force reduces stress, extends diaphragm life and allows
for low shear operation making them suitable for shear sensitive fluids such as
foods, latex and inks.
When one of the diaphragms reaches its limit of its stroke,
the air valve redirects pressurized air to the back side of the opposite
diaphragm, which begins its discharge stroke. The hydraulic forces developed
inside the diaphragm pushes the inlet valve ball off its seat and pulls the
discharge ball off its seat, allowing fluid to flow through the pump discharge.
The cycle repeats itself, completing the full stroke. Over
time, bolts which secure the various components may loosen, causing unwanted
leaks. Periodic bolt tightening can help reduce this risk, ensuring the pump
remains leak free.
Centrifugal Air Pumps
Air-operated double diaphragm pumps are a well-established
positive displacement pump technology that can be utilized across a variety of
applications from chemical maintenance to shifting waste liquids or slurry.
AODD pumps have few moving parts and are a low shear pump making them ideal for
shear sensitive fluids such as foods, latex and inks.
The AODD pump is also an energy efficient and versatile tool
with options of single or multistage and various discharge ports. A key to AODD
performance is the correct impeller for the application – diffuser casings are
ideal for low viscosity liquids while volute cases are better for handling
entrained solids and higher viscosity fluids.
Bushings or sleeves are a sacrificial element within the
pump that acts to absorb abrasion, vibrations and shocks – they slot into a
machined groove allowing rotation but preventing axial movement. Tiebolts are
also commonly used in multistage and side channel pumps to keep ring sections
of the pump tightly connected.
Submersible Pumps
Submersible Pumps are a powerful solution for pushing
liquids such as waste water, sewage and leachate to a designated point. They
can be located underground or above ground and are often used in conjunction
with drain systems.
These pumps have hermetically sealed electric motors that
can be fully submerged in the fluid to be pumped. The motor turns an impeller,
a rotating component with curved blades which create centrifugal force to push
the fluid from the centre of the pump creating high pressure.
They are operated by a float switch that completes the
circuit when water levels rise triggering the pump to operate. As water levels
drop the contactor separates from the circuit allowing the pump to stop. These
pumps are able to operate in a variety of environments including ATEX rated
applications. They are also available in a range of materials of construction
to suit chemical compatibility requirements.
Vertical Pumps
With vertical
pumps, the entire pump is immersed below ground, protecting
equipment and liquid from harsh environments. They can be ideal for
applications where a confined space makes installing a horizontal pump
impractical.
It is important that the intake system for a vertical pump
provides minimal hydraulic turbulences. This can be achieved through suitable
management of the flow area immediately upstream of the impeller entry. It is
also essential that the velocity distribution across the suction barrel length
is as calm as possible.
Air operated double diaphragm pumps (AODD) require a
compressed air supply to drive them. Each of the adjacent liquid chambers are
alternately filled and emptied by fluid that is drawn through a common inlet.
When the inlet ball of one diaphragm reaches its end of its stroke, an air
valve directs pressurized air to the back of the opposite diaphragm, beginning
a suction stroke. This process continues until the inlet valve opens and
atmospheric pressure forces fluid past the discharge ball of the opposite
diaphragm, completing a cycle.
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