A double diaphragm pump is a positive displacement pump. It is made up of two pumping chambers that are alternately filled and expelled using flexible diaphragms. To provide the pumping motion, compressed air is alternately fed into and vented from air chambers on opposing sides of the diaphragms.
These pumps are commonly used in transfer applications and can handle a broad range of feeds, including sludges, slurries, abrasive, and shear sensitive fluids. These pumps have high efficiency and reliability. They can handle harmful fluids in different sectors like chemical, food processing, and more. Here’s a simple explanation of AODD pumps performance and efficiency.
How Do Double Diaphragm Pumps Work?
Air-operated pumps work by displacing fluid from one of two liquid chambers with each stroke. AODD pumps require a certain amount of pressure and air volume to convey the fluid. The two diaphragms are coupled by a shaft with two intake valve balls and two outlet valve balls. The diaphragm functions as a membrane, separating the liquid and compressed air supply.
Driving the diaphragms with compressed air pressure rather than the shaft balances the load and reduces mechanical stress. This permits the valve balls to open and shut against the valve seats, directing the liquid flow.
Air-Operated Double Diaphragm Pump Mechanisms
The compressed air from an AODD pump enters an air motor. The air motor directs the air to press a diaphragm, which forces the liquid out. Another diaphragm linked to the first is pulled, forming a hollow on the other side and replenishing the second liquid chamber.
One-way valves (ball valves or flap valves) are located at the top and bottom of both diaphragms. When a cavity closes, the liquid is pushed up and out. On the other side, it creates another hollow to suck the liquid within. This can happen up to 400 times every minute.
Efficiency Features of Double Diaphragm Pumps
- Energy Savings: These pumps use compressed air, making them more energy-efficient compared to some electric pumps, especially in locations where an air supply is already available.
- Dry-Run Capability: Double diaphragm pumps can safely run even if the fluid supply runs out, helping prevent damage and operational downtime.
- Self-Priming Design: They can start pumping without needing to be filled with liquid first, saving time during setup or restart.
- Handles Various Fluids: Capable of pumping viscous, abrasive, corrosive, or hazardous fluids that many other pump types cannot handle effectively.
- Low Maintenance: Fewer moving parts and a simple construction make servicing easier, reducing downtime and repair costs.
- Leak-Free Operation: The hermetic seal created by the diaphragms prevents leaks, which is critical when handling hazardous substances or maintaining clean processes.
Conclusion
Nirmala Pumps & Equipments
Nirmala Pumps & Equipments is an Indian company that manufactures and supplies pump systems, valves, strainers, and pneumatic pumps since 1989. We provide services to different industries, both domestically and internationally, such as citrus, distilling, wastewater treatment, and petroleum.
