Air-Operated Double Diaphragm pumps share the same basic pumping principle, but not all AODD pumps are designed the same way.
Over the decades, manufacturers around the world have developed their own approaches to air distribution, diaphragm design, check valves, internal flow paths, materials, maintenance and compressed-air efficiency.
Some companies played an important role in the early development of AODD technology. Others introduced different materials, pump configurations or engineering solutions for particular fluids and applications.
AODD PumpCo explores the companies behind these pumps — who they are, where they came from, what they developed and what makes their technology different.
Not simply who makes an AODD pump — but what makes each maker different.
At first glance, two AODD pumps can look very similar.
They may have the same connection size, similar maximum flow, similar operating pressure and even similar body materials.
But look inside, and the differences can be significant.
These differences can affect how a pump performs, how much compressed air it consumes, what fluids it can handle, how easily it can be repaired and how suitable it is for a particular application.
Understanding the manufacturer is therefore about more than recognizing the name on the pump.
Explore Wilden
Discover:
SANDPIPER is another long-established name in the development of air-operated diaphragm pumping.
The brand is associated with Warren Rupp and has a long history in industrial AODD pumps, including equipment developed for demanding dewatering, solids-handling and process applications.
Its pump range has included conventional ball-valve AODD pumps as well as flap-valve configurations intended for fluids containing larger solids.
Explore SANDPIPER
Discover:
ARO is a long-established name in pneumatic equipment and fluid-handling technology.
Its AODD pump range has developed into a broad family of pumps used for industrial fluid transfer, chemicals, coatings and many other applications.
ARO has developed different pump sizes, materials, diaphragm options and air-system technologies to suit a wide range of operating conditions.
Explore ARO
Discover:
Yamada is a Japanese manufacturer with a long history in industrial equipment and fluid-handling products.
Its diaphragm-pump business developed into an internationally recognized range of AODD pumps used for chemical transfer, coatings, industrial processes and general fluid-handling applications.
Yamada has developed its own approaches to air-valve operation, diaphragm construction and pump design.
Explore Yamada
Discover:
Graco is a major fluid-handling equipment manufacturer whose products extend well beyond diaphragm pumps.
Within its pump portfolio, Husky has become a widely recognized name for Graco’s double-diaphragm pump range.
Husky pumps have been developed in different sizes, materials and configurations for a broad range of industrial fluid-transfer applications.
Graco has also expanded its double-diaphragm technology into electrically operated designs.
Explore Graco Husky
Discover:
DEPA is a European name associated with air-operated double-diaphragm pumps for industrial fluid handling.
Its pump ranges have been developed in different construction materials and configurations for chemicals, industrial liquids and other demanding applications.
DEPA represents another approach to developing the basic AODD pumping principle for different industries and operating conditions.
Explore DEPA
Discover:
Blagdon is a British name associated with air-operated double-diaphragm pumping.
Its pumps have been used in industrial applications involving chemicals, coatings, solids-containing liquids and general process-fluid transfer.
Like other established AODD manufacturers, Blagdon has developed its own approaches to pump construction, air distribution and maintenance.
Explore Blagdon
Discover:
Debem is an Italian pump manufacturer with decades of experience in industrial fluid handling.
The company developed its own diaphragm-pump technologies and approaches to pneumatic air distribution.
Its AODD portfolio includes pump families designed for chemical transfer, industrial processes and general fluid-handling applications.
Explore Debem
Discover:
Almatec is particularly associated with engineered non-metallic air-operated diaphragm pumps.
Its pump technologies have been developed for applications involving aggressive chemicals, high-purity liquids and other demanding fluids where material selection is particularly important.
Almatec provides an interesting example of how construction materials and engineering design can differentiate one AODD pump from another.
Explore Almatec
Discover:
Verder is a broader pump and fluid-handling organization covering several different pumping technologies.
Verderair represents its air-operated diaphragm-pump offering.
The range includes different pump sizes, construction materials and configurations for industrial fluid-transfer applications.
Explore Verderair
Discover:
The global AODD industry extends well beyond the manufacturers listed above.
There are established regional manufacturers, specialist diaphragm-pump companies, multinational pump groups, OEM manufacturers and newer entrants into the AODD market.
Some concentrate on general industrial pumps.
Others specialize in:
AODD PumpCo will gradually expand this directory as manufacturers and technologies are researched and documented.
The objective is not to create the longest possible list of brands.
The objective is to understand:
Who makes the pumps, where they came from, what they developed and what makes their technology different.
The basic AODD operating principle may be similar.
But the engineering around that principle can be very different.
Four areas are particularly important.
What Controls the Pump?
The air distribution system controls the alternating movement of the diaphragms.
Compressed air must be directed from one side of the pump to the other at the correct point in each stroke.
Manufacturers have developed different approaches involving:
These differences can influence:
Reliability
Air consumption
Cycling characteristics
Maintenance
Ease of repair
The air system is therefore one of the most important areas to understand when comparing AODD pump designs
What Controls the Pump?
The air distribution system controls the alternating movement of the diaphragms.
Compressed air must be directed from one side of the pump to the other at the correct point in each stroke.
Manufacturers have developed different approaches involving:
These differences can influence:
Reliability
Air consumption
Cycling characteristics
Maintenance
Ease of repair
The air system is therefore one of the most important areas to understand when comparing AODD pump designs
Controlling the Direction of Liquid
Check valves allow liquid to enter and leave the pumping chambers while preventing reverse flow.
Many conventional AODD pumps use:
Ball + Seat
As the diaphragms move, the balls alternately lift from and return to their seats.
Manufacturers may use different:
Some diaphragm pumps use flap valves instead.
Flap-valve designs can be particularly useful where the pumped liquid contains larger solids that may not pass easily through a conventional ball-valve arrangement.
The check-valve system can therefore significantly affect the types of fluids a pump can handle.
AODD pumps are available in many construction materials.
Metallic Pumps
Common materials include:
Non-Metallic Pumps
Common materials include:
But selecting a pump body is only part of the material-selection process.
All wetted components must be considered, including:
Pump Body + Diaphragms + Balls + Seats + O-Rings + Seals
The correct combination depends on the fluid, concentration, temperature and operating conditions.
When comparing pumps, it is easy to concentrate on three catalogue figures:
Maximum Flow
Maximum Pressure
Connection Size
These figures are important.
But they do not tell the whole story.
Two pumps with similar catalogue ratings can differ in:
Actual pump performance also depends on the operating conditions.
A maximum-flow figure should therefore not be treated as the expected flow for every installation.
AODD PumpCo looks beyond the headline numbers to understand how the pump is designed and how that design affects the application.
The global AODD industry extends well beyond the manufacturers listed above.
There are established regional manufacturers, specialist diaphragm-pump companies, multinational pump groups, OEM manufacturers and newer entrants into the AODD market.
Some concentrate on general industrial pumps.
AODD PumpCo will gradually expand this directory as manufacturers and technologies are researched and documented.
The objective is not to create the longest possible list of brands.
The objective is to understand:
Who makes the pumps, where they came from, what they developed and what makes their technology different.
Every manufacturer featured on AODD PumpCo will be studied using a consistent approach.
Who is the manufacturer?
Where did the company originate?
Who owns the brand today?
When did the company become involved in diaphragm pumping?
What important milestones followed?
What problems or applications influenced the development of its pumps?
What pump technologies, designs and product families has the manufacturer developed?
How do its air system, diaphragms, check valves and liquid section work?
Where are its pumps commonly used?
What applications or industries are particularly relevant?
What engineering characteristics distinguish the manufacturer’s approach?
What pump families, models, repair kits and wear components exist?
Can older pumps still be identified?
How are the parts organized?
These questions form the basis of every AODD PumpCo manufacturer profile.
Buying the pump is only the beginning of its life.
AODD pumps contain components that eventually require inspection or replacement.
Common service parts include:
Parts differ between manufacturers, pump series and even different versions of the same pump family.
Correct identification is therefore important.
Not every pump operating in a factory today is a current model.
AODD pumps can remain in service for many years.
This means users may be searching for:
An old pump model
A discontinued series
An unknown diaphragm
A repair kit
An air-valve component
A part number from an old manual
For this reason, AODD PumpCo aims to document not only current pump families but also useful information about older and legacy models where reliable information is available.
This will gradually connect with the AODD PumpCo Parts Finder.
Not every pump operating in a factory today is a current model.
AODD pumps can remain in service for many years.
For this reason, AODD PumpCo aims to document not only current pump families but also useful information about older and legacy models where reliable information is available.
This will gradually connect with the AODD PumpCo Parts Finder.