AOBL air-operated double diaphragm pumps (AODD pumps) are designed for fluid transfer in a variety of applications. Our diaphragm pumps reliably convey a wide range of fluids, viscous media, corrosive fluids and solids. AOBL offers diaphragm pumps in different materials (metallic, non-metallic) and drive principles (electric, pneumatic) to meet the needs of your application.

AOBL pumps are not only the most cost effective, reliable and energy efficient solution, but our advanced air distribution system dramatically increases pump productivity by reducing air consumption and maintenance of most energy. The ideal solution for increasing your productivity, reducing energy consumption, reducing air consumption and simplifying maintenance.

As one of the leading manufacturers of pneumatic diaphragm pumps, we offer a full line of AODD pumps in a variety of sizes and flow rates to meet the versatility and flexibility you need to make pumping simple.




1/2″, 3/4″





Air Diaphragm Pumps Tailored to Your Application

AOBL diaphragm pumps are available in a wide range of flow rates and sizes, allowing you to vary the flow outlet and discharge pressure. Performance is enhanced through the use of air filters/regulators and pulsation dampers.

Each AOBL AODD pump can be customized to meet your fluid transfer needs. Choose from a wide range of diaphragm materials, housing options, and accessories. Find metal or plastic fluid sections and housings that can handle any fluid, including corrosive and abrasive.

Pump body materials

  • Polypropylene(PP)
  • Polyvinylidene Fluoride(PVDF)
  • Aluminum Alloy
  • Stainless Steel
  • Cast Iron

Diaphragm materials

  • Teflon(PTFE)
  • Santoprene
  • Fluorine Rubber
  • Polyurethane
  • Buna-N Rubber

Advantages of AOBL Air operated diaphragm Pumps

AOBL diaphragm pumps offer many unique advantages in a variety of applications, including:

  • Self-priming
  • Shear sensitive
  • High suction range
  • Variable flow and pressure
  • Viscous and non-viscous product transfer
  • Easy to operate and maintain
  • Corrosion resistant
  • No heat generation

What is an air operated diaphragm pump?

Pneumatic diaphragm pump uses compressed air as power source, flow with the change of back pressure (outlet resistance) and automatic adjustment. Can pump all kinds of corrosive liquid, liquid with particles, high viscosity, volatile, flammable, highly toxic liquid.

How pneumatic diaphragm pumps work?

When compressed air enters the pneumatic part of the pneumatic diaphragm pump, it first drives one diaphragm to move in the other direction, causing negative pressure in one chamber of the pump, which opens the suction valve and draws the liquid into the pump.

Subsequently, the compressed air through the pneumatic part of the pneumatic valve, drive another diaphragm to the opposite direction of movement. At this time, the original negative pressure within the chamber of the diaphragm movement, so that the liquid under pressure through the discharge valve out of the pump.

With the continuous switching of the pneumatic valve in the pneumatic section, the two diaphragms alternate reciprocal movement to achieve continuous and uninterrupted liquid delivery.



  1. Pumping peanut butter, pickles, mashed potatoes, small red sausages, jam, applesauce, chocolate, etc.
  2. Pumping paint, gum, pigment.
  3. Adhesives and glues, all kinds of available pump suction.
  4. All kinds of tile, porcelain, brickwork and pottery glaze slurry.
  5. After the oil well is drilled, the sediment and grout are sucked by the pump.
  6. Pumping various emulsions and fillers.
  7. Pumping various kinds of sewage.
  8. Pumping for oil tankers and barges to suck sewage from the bunker.
  9. Pumping water in mines, pits, tunnels, mineral processing, slag. Pumping cement grout and mortar.
  10. All kinds of rubber slurry.
  11. Various abrasives, corrosives, petroleum and mud, cleaning oil scale and general containers.
  12. All kinds of highly toxic, flammable and volatile liquids.
  13. Various strong acids, strong alkalis, strong corrosive liquids.

Yes, it can run continuously. It can also be idle, but this is not usually recommended.

  1. An air source must be available on site to provide a power source for the pump.
  2. Pump operation may cause strong pulsations and high pulsations may cause damage to the piping system if not equipped with pulsation dampers.

Most air-operated diaphragm pumps can handle air pressures of up to 8.4 bar.

Compared with alternative pump (electric) types, pneumatic diaphragm pumps have higher reliability because they contain few moving parts, no sliding contact parts, and no shafts or bearings that require sealing media, with low maintenance costs. And with air as the power source, they do not generate sparks and are safer.