Air-Operated Double Diaphragm pumps or AODD pumps are versatile, self-priming, and designed to handle almost any liquid – from thin solvents to thick slurries. Because they run on compressed air, they are safe in explosive environments and widely used in mining, chemical, food & beverage, and wastewater applications.
The key to selecting the right pump lies in choosing the correct construction material for the liquid being pumped. The right choice ensures safety, efficiency, and long service life.
Material Selection for Diaphragm Pumps (AODD)
| Pumping Liquid | Recommended Construction Material | Brands |
|---|---|---|
| Water & Neutral Liquids | Aluminum, Polypropylene | Yamada, Wilden, BSK |
| Acids (Low pH) | PVDF, PTFE (Teflon), Polypropylene | Verderair, ARO, BSK Chemical Series |
| Caustic / Alkaline (High pH) | Stainless Steel 316, PVDF | Wilden, Tapflo, BSK Stainless |
| Oils & Hydrocarbons | Aluminum, Stainless Steel, Nitrile Diaphragm | ARO, Graco, BSK Oil Transfer Series |
| Solvents | PTFE, Stainless Steel | Verderair, Yamada, BSK Industrial |
| Slurry / Abrasives | Cast Iron, Stainless Steel, Santoprene Diaphragm | Tapflo, Sandpiper, BSK Mining Series |
| Food & Beverage | FDA-Approved Stainless Steel with EPDM/PTFE | Wilden Hygienic, Verderair Pure |
Advantages of Diaphragm (AODD) Pumps
- Versatility – Pumps thin solvents, slurries, and even solids.
- Self-Priming – Starts without external priming.
- Explosion-Safe – Operates on compressed air, no sparks.
- Simple Maintenance – Easy diaphragm replacement.
- Run-Dry Capability – Can operate without liquid briefly.
Disadvantages
- Air Demand – Needs a stable compressed air supply.
- Noise – Louder than centrifugal pumps.
- Flow Capacity – Lower than large centrifugal systems.
FAQ – Diaphragm / AODD Pumps
Q1: What makes Diaphragm pumps AKA AODD pumps different from centrifugal pumps?
AODD pumps handle a wide range of fluids and can run dry without damage. Centrifugal pumps are more efficient for high-volume clean water but cannot handle slurries or solids as effectively.
Q2: Are AODD pumps suitable for chemicals?
Yes. Brands like BSK, Verderair, and Wilden offer PVDF and PTFE-lined pumps that resist aggressive chemicals.
Q3: Can I use AODD pumps in mining?
Definitely. BSK Mining Series and Sandpiper pumps are engineered for dewatering and slurry transfer, making them highly popular in South African mining.
Q4: What about food-grade applications?
For hygienic environments, pumps like Wilden Hygienic or Verderair Pure are built in stainless steel with FDA-approved diaphragms.
Q5: Where can I buy reliable AODD pumps?
At Pumps Africa & Tools, we supply leading brands including BSK, Wilden, Tapflo, Yamada, Verderair, ARO, Graco, and Sandpiper. Our specialists match the right pump materials and brand to your liquid, ensuring performance and value.
✅ Buying Tip: For heavy-duty mining and wastewater, BSK Diaphragm pumps provide robust, cost-effective performance. For corrosive chemicals or hygienic uses, premium brands like Wilden, Verderair, and Tapflo lead the way.