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How Do Air Powered Diaphragm Pumps Work?

Air-powered diaphragm pumps are used in various industries and facilities of different sizes. Compressed air is used as a source of energy in the working of such pumps. Let’s understand the air-powered diaphragm pump in detail in the coming paragraphs. AODD or air-powered diaphragm pumps are used for transfer applications. They are very easy to maintain and are reliable. They cannot be used in low-pressure applications as they are vulnerable to icing. 

AIR POWERED DIAPHRAGM PUMPS

WRS have been metering pumps and air-operated diaphragm pump manufacturers since 2008. They deal with a variety of products such as digital intelligence Eignal series, motor-driven strust series, solenoid driven picol series, accessories, and air-powered diaphragm pump.

Working of the AODD 

Air-powered diaphragm pumps are positive displacement pumps where compressed air is transferred from one compartment to another. There is a shaft that helps this happen with its movement simultaneously. The movement helps the liquid in one chamber to move out and enter into the discharge piping. The other chamber gets filled with the liquid at the same time. AODD handles slurries, sludge, and abrasive and shear-sensitive fluids. The diaphragm acts as a separation between the liquid and the air.  The alternate back and forth movement or strokes of two diaphragms fitted on a common shaft enables the movement of the fluid. 

 The working of an AODD pump can be explained as below stepwise:-

  1. The compressed air directs the air to the first chamber. 

  2. The movement of the shaft to the left and the diaphragms causes an increase in the volume of the second pumping chamber and a decrease in the volume of the first pumping chamber. The valves placed on each side of the pumping chamber help the fluid flow in one direction only. It happens from the inlet to the discharge. The fluid is brought in from the inlet to the second chamber and discharged from the first chamber. 

  3. When the shaft completes the stroke, the air is vented from the first chamber and the compressed air is directed towards the second chamber. 

  4. Now when the shaft moves to the right, the volume of the second pumping chamber decreases, and that of the first pumping chamber increases. The fluid moves from the second chamber into the first chamber. 

  5. When the shaft completes the stroke, the air is vented from the second chamber and the compressed air is directed towards the first chamber. 

Components and its importance of AODD pump

  • The AODD pump has an inlet and air vent, ball valve, diaphragm, air chamber, and pumping chamber. When the air moves out of the compressor, it is dirty, wet, and unmanageable. Such unmanageable air damages the AODD pumps. AODD pumps are damaged due to the dirty and unmanaged air.  The best quality air is important to keep the air-operated diaphragm pumps in proper order. 

  • Filter regulators assist in filtering air and in controlling pressure.  The contaminants in the form of solid and liquid states are thrown away with the help of filter regulators. This is very essential in providing clean and continuous air pressure. 

  • The diaphragm is selected based on the chemicals to be used in the pumps.  They check the valves for pumping fluid.  AODD diaphragms have good suction features which are helpful for managing sludge or slurries. They are also very helpful in sticky liquids.  The suction ports position is dependent on the ball valves and flap valves. This means in ball valve pumps the suction ports are at the bottom while in flat valves the suction ports are at the top. 

  • Ball valves or flaps are fitted according to the fluid pumped. Ball valves are best for solids that float or remain at the bottom. Flat valves are good for solid slurries or bigger solids. Ball valves don’t wear easily as flap valves. They wear evenly as there is rotation during the operation. The pressure differences are recognized for these valves to operate in a pumped fluid.

  • AODD pumps create pulse waves. Pulsation dampeners are used to absorb this energy by creating a low pressure in the system. 


Conclusion 

The simple technology applied in the AODD is used in various industries. Industry must take the advice of an engineer to confirm whether such pumps fit the application.


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