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How does an Air Operated Diaphragm Pump Work?
Air operated diaphragm pumps are versatile, efficient, and reliable. They are used in a wide range of industries, including mining, oil and gas, chemical, food and beverage, and wastewater treatment. Here, we’ll take a closer look at how these pumps operate.
1. Principle of operation.
An air operated diaphragm pump operates on the principle of positive displacement. The pump has two chambers separated by a flexible diaphragm. On one side of the diaphragm is the liquid chamber, and on the other side is the air chamber. The liquid inlet and outlet ports connect to the liquid chamber.
2. Control system.
The control system of an air operated diaphragm pump consists of two air valves, known as the pilot valves. The first valve controls the air supply to the pump’s air chamber, while the second valve controls the air release. These valves control the flow of air to and from the pump.
3. Cycles of operation.
When the pump is activated, air enters the air chamber through the first pilot valve, pushing the diaphragm toward the liquid chamber. This creates a vacuum in the liquid chamber, causing liquid to enter the pump through the inlet port and fill the void left by the moving diaphragm. The liquid-filled air chamber is then pressurized as a result of the compressed air.
4. Liquid discharge.
When the pressure in the air chamber reaches its maximum level, the second pilot valve is opened, which releases the compressed air from the chamber. This causes the diaphragm to move toward the air chamber, pushing out the liquid that was just drawn in through the outlet port.
5. Repeat cycle.
Once the liquid is fully discharged, the first pilot valve opens again, allowing the air to enter the air chamber and starting the cycle all over again. This process is repeated continuously as long as the pump is in operation.
6. Diaphragm selection.
The diaphragms used in air operated diaphragm pumps are made from a variety of materials, depending on the application. These materials include neoprene, Buna-N, Viton, and PTFE. The diaphragm material must be compatible with the liquid being pumped to ensure optimal performance and longevity of the pump.
7. Advantages of air operated diaphragm pumps.
There are several advantages of using air operated diaphragm pumps. They have excellent self-priming capabilities, meaning they can operate without any liquid in the pump. They can handle a variety of liquids, including viscous, abrasive and corrosive fluids. AOD pumps are also capable of dry running without damage to the pump.
In conclusion, air operated diaphragm pumps are a reliable and versatile option for many industries. By understanding how these pumps operate, you can select and use them effectively and efficiently.