Air-Operated Double Diaphragm (AODD) pumps are a type of positive displacement pump that use compressed air as the driving force to transfer fluids. They are widely used in various industries for applications that involve pumping viscous fluids, abrasive slurries, or fluids containing solids. AODD pumps are known for their versatility, ability to handle a wide range of fluids, and suitability for both low and high-pressure operations. Here are some key features and components of AODD pumps:

1. Diaphragms: AODD pumps have two flexible diaphragms that reciprocate back and forth to create suction and discharge cycles. The diaphragms separate the air and fluid chambers, preventing the pumped fluid from coming into contact with the air supply.
2. Air Distribution System: The air distribution system consists of a series of air valves that control the flow of compressed air to the diaphragms. The valves alternate the air supply to each diaphragm, causing them to move in an alternating fashion and create suction and discharge strokes.
3. Pump Casing: The pump casing houses the diaphragms and fluid chambers. It is designed to provide a sealed enclosure for the fluid and diaphragm movement while allowing for the passage of fluid in and out of the pump.
4. Inlet and Outlet Ports: AODD pumps have separate inlet and outlet ports for fluid transfer. The fluid enters the pump through the inlet and is discharged through the outlet during the discharge stroke of the diaphragms.
5. Check Valves: Check valves, also known as ball valves or flap valves, are located at the inlet and outlet ports to control the flow direction and prevent backflow of the pumped fluid.
6. Air Control System: AODD pumps require a compressed air source to operate. The air control system includes components such as an air filter, pressure regulator, and lubricator to ensure proper air supply and control.

AODD pumps offer advantages such as self-priming capabilities, dry-run ability, and the ability to handle fluids with high viscosity, solids, or abrasive particles. They can handle variable flow rates and are often used for transferring fluids in chemical processing, paint and coatings, food and beverage, and wastewater treatment industries.

Proper selection and sizing of AODD pumps based on factors such as fluid viscosity, flow rate, pressure requirements, temperature limits, and chemical compatibility are important for optimal performance. Regular maintenance, including diaphragm inspection and replacement, is necessary to ensure the pump’s reliable operation. It’s essential to follow manufacturer guidelines and safety precautions when operating AODD pumps.

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