AOBL is a professional manufacturer of double diaphragm pumps, designed and manufactured for industrial and chemical transfer applications. We are always committed to continuously developing the most complete line of diaphragm pumps, including air operated diaphragm pumps, electric diaphragm pumps and specialty diaphragm pumps. With a wide range of flow and size options. Both metal and plastic housings easily handle corrosive and abrasive fluids. Leading the way in quality, durability and availability.

AOBL double diaphragm pump in field application
AOBL double diaphragm pump in field application

Pneumatic and electrically operated double diaphragm pumps for a wide range of applications

AOBL’s air-operated double diaphragm pumps feature a unique design construction with stall-free, low-pulsation air valves to ensure fast changeover and minimal downtime.

AOBL’s electric double diaphragm pumps are ideal for applications that require low pulsation and smooth flow. Our energy-efficient electric drives reduce energy consumption significantly compared to conventional air-operated diaphragm pumps.

Each pump is built with rugged materials and construction to resist corrosion and wear, and provide long, trouble-free product life.

Air operated or electric diaphragm pumps?

The choice of an air-operated or electric diaphragm pump depends on many factors, including the application site, flow rate, pressure, media and budget. The following are some of the main points to consider:

  1. Application site: pneumatic diaphragm pumps are usually used outdoors, in heavily contaminated or explosion-proof applications, while electric diaphragm pumps are usually used indoors or in less explosion-proof applications.
  2. Flow: pneumatic diaphragm pumps have a larger range of flow adjustment than electric diaphragm pumps.
  3. Pressure: pneumatic diaphragm pump pressure is higher than the electric diaphragm pump.
  1. Media: pneumatic diaphragm pumps have a small shear force on the medium, suitable for conveying high viscosity media, such as lubricants, paints, etc.
  2. Budget: The cost of pneumatic diaphragm pumps is usually lower than that of electric diaphragm pumps.
  3. Drive mode: pneumatic diaphragm pumps are pneumatically driven, electric diaphragm pumps are electrically driven.

View AOBL double diaphragm pump products

Superior engineering for lasting performance

Customizable Fluid Sections

Easily customize your fluid selection with AOBL’s fluid transfer pumps with housings that can handle all fluids, including corrosive and abrasive.

Multiple Power Source Options

Depending on your application needs, AOBL’s double diaphragm pumps are available in pneumatic and electric configurations to meet field conditions

Proven reliability

We design and manufacture double-diaphragm pumps to withstand the harshest operating environments. The best materials and the highest quality standards.



Double diaphragm pump can be used to transport fluid with unstable chemical properties, such as flocculation, photosensitive materials, etc., can also be used in harsh environment, such as: industrial and mining wastewater discharge, construction sites, etc. Because double diaphragm pump is not easy to high temperature, not easy to leak, high efficiency, strong performance and other advantages, so it is widely used in all walks of life.

The difference between single diaphragm pump and double diaphragm pump is the structure and working principle is different:

  • Structure: Double diaphragm pump has a symmetrical pump chamber, while single diaphragm pump has only one pump chamber.
  • How it works: A double diaphragm pump adds a diaphragm to each diaphragm chamber than a single diaphragm pump, and fills the space between the two diaphragms with inert fluid. Also set up peephole, photoelectric device or chemical inspection method alarm, so as to take measures to achieve the purpose of safe production. The structure and principle of single diaphragm pump and double diaphragm pump is different, it is mainly driven by motor, using compressed air to promote the diaphragm movement, the upper and lower two one-way ball valve through the diaphragm movement of the pump chamber volume changes, and then promote the liquid discharge.

In addition, the flow rate of a double diaphragm pump is usually greater than that of a single diaphragm pump, but the pressure is usually lower than that of a single diaphragm pump.

  1. Pressure can not be increased: double diaphragm pump pressure is limited by the pressure of the air source, usually only up to 6 bar.
  2. Noise and line vibration: At high flow rates, double diaphragm pumps are noisy and have high line vibration.
  3. Short diaphragm life: Compared to screw pumps, the diaphragm life of double diaphragm pumps is short and easily damaged.
  4. Most applications in small systems: Since the flow rate of double diaphragm pumps is usually not too large, they are mostly used in small systems.