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MSW Pumps - AODD and Submersible Pumps

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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