Pumps that employ air pressure to push fluid through a diaphragm can be found in factories of all sizes and a wide range of fields. These pumps have widespread use throughout industries, from the petrochemical to the food and beverage industries. Their one-of-a-kind construction makes them perfect for moving rough or sticky materials. But how do they function, exactly?

Air Operated Double Diaphragm Pump is a form of positive displacement pump driven by compressed air. A shaft connects the two chambers, allowing them to move in unison as the compressed air is transferred from one to the other.

While one chamber is being filled, the other is being emptied and refilled in a back-and-forth action, forcing liquid into the discharge piping.

What is an Air Operated Double Diaphragm Pump?

This type of pump is called an air-operated double diaphragm pump. Two independent diaphragms on either side of the pump draw in fluid and release it through a manifold at the pump’s outlet. Diaphragm Pumps, AODD, or AOD, are all common shorthand for Air Operated Double Diaphragm Pump. Positive displacement pumps, such as diaphragm pumps, can move fluid with each stroke.

Mechanisms of Air Operated Double Diaphragm Pump

Although similar to other positive displacement pumps, air-powered double diaphragm pumps are distinguished by their use of compressed air rather than liquid. The benefits of employing a perspective-operated double diaphragm pump (AODD) will be the topic of a future blog article, but for now, let’s wrap things up with a quick summary of the control mechanism used by such a pump.

When compressed air is introduced into an Air Operated Double Diaphragm Pump, it travels through an air motor and is then used to “push the liquid out” via a diaphragm. To “draw in the liquid,” one diaphragm must be pressed, while the other must be pulled via a shaft. This creates a cavity on the other side.

Ball or flap valves are common one-way valves installed at the bottom and top of the two chambers. So, closing one cavity forces the liquid to rise and escape while opening another cavity draws the liquid in. The process will repeat itself, shutting one side of the hole while extending the other. All of this may occur at a rate of up to 400 per minute.

The Benefits of Air Operated Double Diaphragm Pump :

• AODD pumps, unlike most other types, are safe to run dry for long periods.

• Because of their air-powered construction, AODD pumps are safe to use in potentially dangerous settings (such as those containing combustible materials), as their mechanisms do not generate sparks during operation.

• The pump’s design keeps process fluids isolated from any mechanical components that they could damage. The pump’s internals is protected against damage thanks to the pump’s design.

Air Operated Pump are available in various materials to accommodate different operating conditions, including temperature and chemical compatibility.

• Many different kinds of metal and non-metal are used in their production.

There are many AODD pumps explicitly created by Air Operated Double Diaphragm Pump  Manufacturers in India for use in the food industry.

Just like any other pump, improper use might cause serious problems. It’s not ideal; therefore, it’s best to see an applications specialist make sure you’re using the best pump for your needs.

Tutorial on Setting Up and Fixing AODD Pumps:

The installation of an Air Operated Double Diaphragm Pump has several unique prerequisites:

  • AODD pumps need to be installed on a solid base plate because of the vibration they create as the diaphragm cycle. Inaction will cause the feet of the pump to wear out over time due to friction, necessitating expensive repairs.
  • Never use a suction pipe or hose for a narrow fluid inlet than the suction port’s opening. This could result in pump hunger and a decrease in operational efficiency. For instance, if the suction port is 1″, only a suction hose that is also 1″ in diameter would fit.
  • Furthermore, the entire system head must be lower than the pump’s duty point for this suction pipe or hose to be as short as practical and as close to the supply vessel as possible.
  • This sort of pump requires a suitably sized air supply pipe. If the airline flowing into the pump is too short, the pump won’t get enough of the “fuel” (compressed air) it needs to work. If you need to use a smaller airline to power the pump, you shouldn’t go more than one pipe size down from the air supply outlet. A pump with a 3/4-inch air supply port requires at least a 1/2-inch air supply line.
  • To manage the AODD pump’s output (flow and pressure), a pressure regulator assembly for the incoming air should be installed in the air supply line.
  • Most AODD pump installation issues can be avoided by first ensuring that the airline size is adequate and installing an air regulator.

In the case of a non-functioning Air Operated Diaphragm Pump, look into the following:

  • Check to see that the air inlet isn’t too narrow. It was already noted that the inlet pipe of the air supply line should have the same diameter as the air inlet port of the pump.
  • Make sure the air pressure entering the pump is at least the minimum psi needed for operation.
  • Look for frozen buildup in the muffler of the pump. Because of their excessive noise output, AODD pumps typically have mufflers installed.
  • These mufflers can function in sub-freezing temperatures due to air compression, but in humid environments, icing may form in the muffler and limit the pump’s performance.

Follow these steps to keep ice from forming on your muffler:

  • Lower the pump’s air pressure
  • Enlarge the pump so it can run at lower rates (i.e., at lower air pressure).
  • The muffler can be vented to an exterior area using a port pipe.
  • Install a water-catching filter on the airline that drains excess water.
  • Put a heater in the ductwork that carries air to the pump.


Nirmala pumps and Equipments is amongst the most prominent Air Operated Double Diaphragm Pump Suppliers in India. These powerful pumps can move volatile chemicals and solvents like acetone and methylene chlorides in the pharmaceutical and chemical industries.