Air-Operated Double-Diaphragm (AODD) pumps are used to displace fluids by using compressed air. These pumps move fluids of various viscosities, even those with suspended solids. Not just that, AODD pumps can also handle corrosive and aggressive fluids with ease. These pumps are used for applications in a range of industries, including chemical processing, wastewater management, mining, construction, cleaning supplies and pharmaceuticals.
To understand the mechanics of AODD pumps, one must first understand its components.
Key Components of an AODD Pump
Diaphragms: AODD pumps consist of two flexible membranes mounted on a shared shaft that continuously moves to and fro, enabling the movement of fluids in and out of the pump’s fluid chamber. Typically made of elastomeric materials such as rubber, neoprene, or PTFE, these diaphragms create suction by expanding and contracting as they are powered by compressed air.
Air Valve: The air valve in an AODD pump is designed to control the flow of compressed air to the diaphragms. It directs air to one diaphragm while venting air from the other, resulting in the pump’s continuous operation.
Check Valves: The check valves of an AODD pump prevent backflow, ensuring the flow of the fluid in only one direction. The kind of check valves used depends on the viscosity or the particle content of the fluid.
Pump Body: The structure where the diaphragms, air valves and check valves are placed is called the pump body. These are usually made of materials such as aluminium, stainless steel, or plastic, depending on the application’s requirements, such as chemical compatibility or weight.
To begin the operation, the air distribution system directs the air supply to the right air chamber and back side of the diaphragm. Due to this air movement, the diaphragm is moved away from the centre towards the liquid chamber. This results in the opposite diaphragm being pulled in the other direction. This opposite diaphragm is now in suction stroke mode, which creates a vacuum that draws fluid into the pump chamber from the inlet.
Once the first diaphragm has completed its stroke, the air valve shifts, sending air to the second diaphragm. This alternating movement continues, creating a consistent fluid flow through the pump. While all this happens, the check valves ensure that the fluid only moves in one direction, preventing backflow and ensuring efficient transfer.
The best part about the AODD pump is its simple and fuss-free design, with only a few moving, wet parts – diaphragms, the two inlet valve balls, and the two outlet valve balls. The diaphragms act as a barrier between the compressed air and the liquid. The use of compressed air ensures the system balances the load on the diaphragms, reducing mechanical stress and extending their lifespan. The straightforward nature of this design makes it easy for operators to adjust pressures and flows for optimal performance.
The simplicity of AODD pumps is further enhanced by its self-priming capabilities. Self-priming allows these pumps to pump fluids without needing to be filled manually.
Another great part of AODD pumps is their ability to operate without electricity. Since they are air-operated, they can be used in hazardous or explosive environments where electric sparks could be a concern. AODD pumps can also run dry without damage, allowing safe operation in cases where the fluid supply might be interrupted. AODD pumps are typically lightweight and portable, enabling operators to move them around the work site. The fewer moving parts also ensure easy maintenance and fewer repairs.
AODD Pumps by Sandpiper
Operating under the wing of IDEX, a well-known name that delivers excellent quality solutions to its customers in India, Sandpiper offers reliable and robust AODD pumps since 1965.
Here are a few features of Sandpiper AODD pumps:
- They are self-primed.
- They boast all-bolted construction, which means they are safe, reliable and low maintenance.
- Lube-free air valve makes it abrasion-resistant.
- All Sandpiper AODD pumps come with a 5-year limited product warranty.
- They are capable of handling high pressure.
- Sandpiper AODD pumps offer easy and efficient pumping out of tough areas.
Air-Operated Double Diaphragm (AODD) pumps are a robust and reliable solution for industries requiring versatile fluid handling capabilities. Their simple design, combined with their ability to handle a wide range of fluids without requiring electricity, make them a preferred choice in applications ranging from chemical processing to food production. However, it is very important to select a good quality AODD pump from a renowned brand. And when it comes to offering reliable, tough, efficient, versatile and cost-effective AODD pumps, Sandpiper is an ideal choice. All Sandpiper pump parts are manufactured according to Hydraulic Institute’s recommended testing procedure, ensuring qualification and exceeding all customer expectations.
To know more about Sandpiper AODD pumps and their features, please check out their website:
https://www.idexindia.in/sandpiper/
