How Does an Air-Operated Double Diaphragm Pump Work?

Despite having a straightforward construction, an air-operated double diaphragm pump (also known as a positive displacement pump or reciprocating pump) may function in a variety of difficult conditions. These mechanical pumps are suitable for continuous, intermittent, and on-off cycling needs.

Air-Operated Double-Diaphragm Pumps: What Are They?

Positive displacement pumps having two pumping chambers are known as air-operated double diaphragm pumps (AODD pumps). The two chambers are alternately filled and emptied by flexible diaphragms. To produce a pumping motion, air chambers on the other side alternately fill and exhaust a compressed air supply.

A variety of feeds, including slurries, sludge, and shear-sensitive and abrasive fluids, may be handled by AODD pumps, which are utilized in transfer applications. The pumps are sturdy, dependable, and simple to maintain. However, they are prone to icing, loud, and only suitable for low-pressure applications.

How Do Air-Operated Double Diaphragm Pumps (AODD Pumps) Operate?

With each stroke, fluid is displaced from one of the two liquid chambers in air-operated double diaphragm pumps. To convey the fluid, AODD pumps need a certain pressure and air volume.

A linked shaft, two intake valve balls, and two output valve balls connect the two diaphragms. The diaphragm separates the compressed air source from the liquid by acting as a membrane.

By using compressed air pressure to drive the diaphragms rather than the shaft, the load is balanced, and mechanical stress is eliminated. This enables the liquid flow to be directed by the valve balls opening and closing on the valve seats.

Air-operated double diaphragm pumps have the following characteristics and advantages:

• AODD pumps are easy to use because of their straightforward design. They need less assembly because they don't have any moving, rotating, or close-fitting pieces. The AODD pump is ready to operate as soon as it is connected to a compressed air source.

• Air-operated double diaphragm pumps may run dry without causing any damage to the motor or its components. Because they don't require any oils or lubricants, they aren't prone to clogging. There is no cooling mechanism needed for the pumps.

• Without harming the pump, you may set the system to cut off when a specific pressure is achieved.

• Because they are small and lightweight, air-operated diaphragm pumps are convenient to use in a variety of settings. They are simple to disassemble, fix, maintain, and clean.

• A variety of media, including water, sewage, harsh chemicals, naphtha, and animal guts, may be handled by AODD pumps. 90% solids, water, and everything in between may be handled by them.

• Because the pumps may be tailored to your application's needs, expenses can be kept to a minimum.

• The compressed air supply powers AODD pumps. They can operate without gasoline or a power supply. This keeps the environment and employees safe by removing any hazardous emissions, short circuits, and liquid splashing on live wires.

• You may safely immerse them in any liquid because they are completely sealed. The pumps provide no danger of contamination, making them appropriate for use in the food and beverage sector.

• There are many sizes and flow rates available for the pump. As little as one gallon per minute can be pumped by it.

• Maintaining double diaphragm pumps is simple. Unless both diaphragms fail, they don't leak. Compared to flap valves, internal ball valves have a superior seal and are less likely to deteriorate.

Mechanisms of Air-Operated Double Diaphragm Pumps

An air motor receives the compressed air from an AODD pump. The liquid is forced out by the air motor, which guides the air to press a diaphragm. The second liquid chamber is refilled when a second diaphragm that is connected to the first one is withdrawn, forming a cavity on the opposite side.

One-way valves (ball valves or flap valves) are located on the top and bottom of the two diaphragms. The liquid is forced up and out of a cavity as it closes. To draw the liquid in, it opens a second chamber on the opposite side. Up to 400 cycles per minute might cause this.

Choosing an Air-Operated Double Diaphragm Pump (AODD Pump)

Even though AODD pump solutions are simple to comprehend, it makes sense to be aware of the individual parts before choosing one. They are used in a variety of sectors and can manage a broad range of chemicals, viscosities, and flow rates. Make sure the pumps you choose have the highest flow rates and the least amount of air consumption and pulsation.

Frequently Asked Questions

What is the lifespan of diaphragm pumps?

A diaphragm pump's motor lasts for many years. However, the diaphragm only lasts six to twelve months.

How can I determine whether a certain fluid may be used with an AODD pump?

To accommodate different fluids, AODD pumps may be modified using a variety of materials and elastomers. The selection of suitable materials for certain applications might be aided by our Chem Guide.

Can an Air-Operated Double Diaphragm Pump Operate Backward?

Since diaphragm pumps depend on one-way valves, they are unable to operate in reverse.

Can You Submerge a Diaphragm Pump?

Indeed, diaphragm pumps are completely submersible and sealed. In order to immerse the pump in any liquid, you may also port the exhaust muffler. AODD pumps include two air chambers, outstanding suction lift capabilities, and straightforward, dependable technology.

What is the price of AODD pumps?

Although the materials and construction of AODD pumps affect their cost, they are often less expensive than other comparable technologies. Lead times are shortened by this affordability and the availability of local inventories. However, for long-term savings and productivity, performance and efficiency should take precedence above initial cost.