Wilden has been manufacturing Air Operated Diaphragm (AOD) pumps since 1955 and is certified to the ISO 9001:2008 standard. Wilden diaphragm pumps successfully deliver a broad range of flow rates and outlet pressures ideal for pumping in the mining and construction industries yet versatile enough for many others.

“Wilden AOD Pumps are available in multiple sizes:
1/4 In1/2 in1 in1 1/2in2in3in4in

Wilden Air-Operated Diaphragm Pumps

All Pumps supply the complete range of genuine Wilden pumps and Wilden spare parts at competitive price levels.

All Pumps are also the experts in servicing Wilden Pumps.

Wilden Models


Wilden pumps are long-lasting and any broken parts can be easily replaced with a huge range of genuine Wilden spare parts. As a result, they are used in a wide range of industries to handle different materials such as chemicals, crude oil, mining, food, beverage, paints and many more.

¼ in (6 mm)

½ in (13 mm)

1 in (25 mm)

1½ in (38 mm)

2 in (51 mm)

3 in (76 mm)

4 in (102 mm)

Wilden Details

Features & Benefits


Wilden Air Operated Double Diaphragm Pumps are extremely versatile due to the following capabilities:

  • Ability to Run Dry – all pumps supplied by Wilden are able to run-dry without damage. This is a very useful feature to have when the pumping application may result in varying & inconsistent suction conditions
  • Ability to Self-Prime – this means that Wilden diaphragm pumps can be used as sump pumps & where positive suction conditions are not available
  • Ability to Pass Solids – the ball & seat/ check-valve design allows for the pump to pass solid particles. This is beneficial in a wide range of applications such as pumping slurries or food products with seeds
  • Variable Flowrate & Discharge Pressure – varying of air supply to the pump will vary the flowrate and/ or pressure that the pump produces; an inexpensive variable speed drive!
  • Seal-less/ Leak Free Design – no mechanical seal means that the pumps are totally contained & leak-free. A leak detector can be fitted to prevent leakage in the case of diaphragm failure
  • Ease of Maintenance – diaphragm pumps are simple, non-technical & require no specialist training for maintenance. There are no special clearances or tools required for pump repairs
  • Lube-free Operation – Wilden air motors do not require external lubrication for operation
  • Anti-Stalling/ Anti-Freezing Air Motor – the air valve is designed to be anti-stalling & anti-freezing; this assists allowing the pumps to be continuously operated.
  • Intrinsically Safe – no electrical power or auxiliary requirements meaning that a Wilden diaphragm pump is Intrinsically Safe and can be operated in many hazardous situations/ applications like underground coal mines.
  • Submersible Options – most models can be fully submerged. Refer to the operation manual for further information. When using a submersible pump, both the liquid path and external components must be compatible with material in which the pump will be submersed. Submersed pumps must have a hose attached to air exhaust and the exhaust piped above liquid level.

Wilden Alternative

Graco Husky AODD pumps are excellent alternatives to Wilden AODD pumps. In fact, they are superior in some aspects and can be 30% more efficient in some instances.

Below is a table of common Wilden pumps and their Graco counterparts.

Pump Size Materials of Construction Wilden Graco
Wetted Elastomers
25 mm (1 inch) Polypropylene Wilflex/ Santoprene 00-9612 D12096
Polypropylene Teflon 00-9616 D12091
PVDF Wilflex/ Santoprene 00-9606 D150A6
PVDF Teflon 00-9604 D150A1
Aluminium Nitrile (Buna) 01-10920 D5C278
Aluminium Teflon 01-10916 D5C311
Stainless Steel Wilflex/ Santoprene 01-10955 D5D366
Stainless Steel Teflon 01-10919 D5D311
Polypropylene Nitrile (Buna) 01-10311 D5B977
Polypropylene Wilflex/ Santoprene 01-10321 D52966
Polypropylene Teflon 01-10315 D52911
PVDF Teflon 01-10323 D5EA11
Aluminium Neoprene 02-12220 647097
Aluminium Nitrile (Buna) 02-12002 647121
Aluminium Wilflex/ Santoprene 02-11957 647116
Aluminium Teflon 02-12224 647129
Stainless Steel Nitrile (Buna) 02-12033 651030
Stainless Steel Wilflex/ Santoprene 02-12120 651029
Stainless Steel Teflon 02-12232 651032
Polypropylene Neoprene 02-10564 649000
Polypropylene Nitrile (Buna) 02-10560 649579
Polypropylene Wilflex/ Santoprene 02-10576 649021
Polypropylene Teflon 02-12239 649006
PVDF Teflon 02-12238 649384
38 mm (1 1/2 inch) Aluminium Neoprene 04-12432 DBC525
Aluminium Nitrile (Buna) 04-12275 DBCGGG
Aluminium Wilflex/ Santoprene 04-12301 DBC666
Aluminium Teflon 04-12590 DBC311
Stainless Steel Neoprene 04-12282 DBD525
Stainless Steel Nitrile (Buna) 04-12443 DBDGGG
Stainless Steel Wilflex/ Santoprene 04-12101 DBD666
Stainless Steel Teflon 04-12594 DBD311
Polypropylene Neoprene 04-10844 DB2955
Polypropylene Nitrile (Buna) 04-10840 DB29GG
Polypropylene Wilflex/ Santoprene 04-10854 DB2666
Polypropylene Teflon 04-12644 DB2911
PVDF Wilflex/ Santoprene 04-11771 DB5666
PVDF Teflon 04-12754 DB5A11
51 mm (2 inch) Aluminium Neoprene 08-13725 DFC525
Aluminium Nitrile (Buna) 08-13765 DFCGGG
Aluminium Wilflex/ Santoprene 08-13842 DFC666
Aluminium Teflon 08-14087 DFC311
Stainless Steel Neoprene 08-13849 DFD525
Stainless Steel Nitrile (Buna) 08-14181 DFDGGG
Stainless Steel Wilflex/ Santoprene 08-13881 DFD666
Stainless Steel Teflon 08-14091 DFD311
Polypropylene Neoprene 08-12034 653500
Polypropylene Nitrile (Buna) 08-12030 DF2955
Polypropylene Wilflex/ Santoprene 08-13629 653500
Polypropylene Teflon 08-14101 653504
PVDF Wilflex/ Santoprene 08-12044 653550
PVDF Teflon 08-14100 653546
76 mm (3 inch) Aluminium Neoprene 15-11799 652090
Aluminium Nitrile (Buna) 15-11800 652134
Aluminium Wilflex/ Santoprene 15-11816 652124
Aluminium Teflon 15-12104 652109
Stainless Steel Nitrile (Buna) 15-11817 652896
Stainless Steel Wilflex/ Santoprene 15-11812 652890
Stainless Steel Teflon 15-12108 652856
Polypropylene Neoprene N/A 652432
Polypropylene Nitrile (Buna) N/A 652426
Polypropylene Wilflex/ Santoprene N/A 652423
Polypropylene Teflon 15-10668 652404


Due to their versatility, Wilden Diaphragm Pumps are suitable for use in a wide range of industries.



Wilden’s pumping solutions are leading the way in energy efficiency in storage terminals, biofuels and solar cell manufacturing. Wilden diaphragm pumps play a vital role as transfer points from one mode of transportation to another and as safe, secure storage locations until product transfer is needed. Wilden is also committed to helping build a clean energy economy through the use of biofuels.

Typical Applications Handled:
  • Raw crude oil
  • Chemicals
  • Caustics
  • Ethanol
  • Biodiesel
  • Gases
  • Crude oil
  • Caustics
  • Refined petroleum products
  • Solvents
  • Solar cell manufacturing
  • Petroleum
  • Lube oils
  • Gasoline
  • Diesel fuel


Wilden is a recognized leader in the process industries as you can find Wilden diaphragm pumps in many of the top chemical, food and beverage and pharmaceutical plants around the world.

Typical Applications Handled:
  • Acids
  • Solvents
  • General chemicals
  • Pulp and paper
  • Caustics
  • Soap & detergents
  • Paints, inks & coatings
  • Cosmetics
  • Solvent-less coating
  • Alcohols


Wilden offers a wide range of hygienic and bio-pharmaceutical pumps for various food, beverage, dairy, personal care and pharmaceutical applications. When it comes to safety, performance and gentle transfer solutions, trust Wilden: the evolution of clean.

Typical Applications Handled:
  • Personal care
  • Confectionery
  • Fruits and vegetables
  • Poultry, fish and meat
  • Filling/batching
  • Dairy
  • Pharmaceutical
  • Sauces, purees and beverages
  • High purity product transfer
  • Ingredient receiving / unloading


Wilden plays a critical role in handling and transferring fluids used in municipal and industrial water and wastewater plants.

Typical Applications Handled:
  • Wastewater systems
  • Rehabilitation systems
  • Distribution
  • Metal fabrication

Materials of Construction

The Wilden range has the widest of pump materials of construction options available in the field of air operated diaphragm pumps.



  • Aluminium
  • Cast Iron
  • 316 Stainless Steel
  • 316 Hastelloy “C”


  • Polypropylene
  • PVDF
  • PTFE
Wetted Material Compatibility
Fluid Solutions Numerpic PH Level Wetted Section Construction Metals


  • Neoprene: An excellent general purpose diaphragm for use in nonaggressive applications such as water-based slurries, well water or sea water. Exhibits excellent flex life and low cost.
  • Buna-N: Excellent for applications involving petroleum/oil-based fluids such as leaded gasoline, fuel oils, hydraulic oils, kerosene, turpentines and motor oils.
  • EPDM: Excellent for use in applications requiring extremely cold temperatures. It may also be used as a low cost alternative for pumping dilute acids or caustics.
  • Viton®: Excellent for use in applications requiring extremely hot temperatures. Viton® may also be used in aggressive fluids such as aromatic or chlorinated hydrocarbons and highly aggressive acids. PTFE would normally be used with these aggressive fluids as its flex life is better than Viton®; however, in applications involving suction lift outside the range of PTFE, Viton® will be the preferred choice for highly aggressive fluids.


  • Polyurethane: An excellent general purpose diaphragm for use in nonaggressive applications. This material exhibits exceptional flex life and durability. Wilden’s most economical diaphragm. Also available as part of Wilden’s EZ-Install flex-profile diaphragm line.
  • Wil-Flex™: Made of Santoprene™, this diaphragm is an excellent choice as a low cost alternative to PTFE in many acidic and caustic applications such as sodium hydroxide, sulfuric or hydrochloric acids. Wil-flex™ offers excellent abrasion resistance and durability, at a cost comparable to neoprene. Sanitary options include: full-stroke length Integral Piston Diaphragms (IPD) and a sanitary Wil-Flex™ material with a special flex profile allowing for an “easy install.”
  • Saniflex™: Made of Hytrel®, this diaphragm exhibits excellent abrasion resistance, flex life and durability. This material is FDA approved for food processing applications. This outstanding general purpose diaphragm is also available as part of the Wilden’s EZ-Install flex-profile diaphragm line.
  • Geolast®: Equivalent to nitrile (Buna-N), this diaphragm is an injection-moulded material that is an excellent choice for applications requiring enhanced oil resistance. This material exhibits exceptional performance for a variety of fluids.


  • PTFE: Excellent choice when pumping highly aggressive fluids such as aromatic or chlorinated hydrocarbons, acids, caustics, ketones and acetates. Wilden’s legacy PTFE diaphragms exhibit good flex life; and now Wilden has coupled its knowledge of PTFE with over 55 years of diaphragm testing to bring a “full-stroke” length option for maximum yield and high suction lift, for the world’s toughest applications.
  • Wilden also offers PTFE integral piston diaphragms that offer superior product containment. The smooth contoured shape makes this diaphragm an excellent choice for sanitary or ultra-pure applications.


Wetted Construction

  • Acetal: –28.9°C to 82.2°C
  • Carbon-Filled Acetal: –28.9°C to 65.6°C
  • Nylon: –17.8°C to 93.3°C
  • Polypropylene: 0°C to 79°C
  • PVDF: –12°C to 107°C
  • Teflon® PFA: –28.9°C to 107.2°C

Elastomer Temperature Limits

  • POLYPROPYLENE: 0°C to 79°C
  • PVDF: –12°C to 107°C
  • PFA: 7°C to 107°C
  • NEOPRENE: –18°C to 93°C
  • BUNA-N: –12°C to 82°C
  • EPDM: –51°C to 138°C
  • ACETAL: –29°C to 82°C
  • POLYETHYLENE: 0°C to 70°C
  • VITON® FKM: –40°C to 177°C
  • WIL-FLEX™: –40°C to 107°C
  • SANIFLEX™: –29°C to 104°C
  • POLYURETHANE: –12°C to 66°C
  • PTFE: 1: 4°C to 104°C
  • NYLON: –18°C to 93°C
  • GEOLAST®: –40°C to 82°C



The Wilden diaphragm pump range is ably supported by a range of accessories that complement air operated diaphragm pump function & capability. Wilden’s accessory products add value to your liquid process and expand the application range of Wilden diaphragm pumps by augmenting the performance and/or utility of the pump. Our electronic controllers automate your Wilden pump for batching and other electronically controlled dispensing applications. We can also create laminar process flow by eliminating pump pulsation or control the liquid level within a system of process.



An inherent characteristic of reciprocating pumps is the pressure change between each pump stroke. The Equalizer® can be used to provide a supplementary pumping action between pump strokes, thus minimising pressure fluctuation while offering protection to your pumping system. The Equalizer® reduces water hammer, absorbs acceleration head, lowers system maintenance costs and minimises pipe strain protecting in-line equipment. Sizes available are SD1⁄2 13mm (1⁄2″) inlet/discharge, SD1 25 mm (1″) inlet/discharge, SD2 51 mm (2″) inlet/discharge and SD3 76 mm (3″) inlet/discharge.



The inherent features of the Wilden air-operated pump and Accu-Flo™ pump technology allow it to excel as a utilitarian drum pump. Various speed and pressure capability, the ability to run dry, self-prime and dead-head offers you flexibility at a low cost. The Wilden universal drum pump kit enables Wilden ¼” and ½” pumps to adapt directly to drums for cost-effective, efficient liquid transfer.

  • Universal kit for 6 mm (1/4″) and 13 mm (1/2″) pumps
  • Fits 51 mm (2″) NPT bungholes
  • Tube length can be cut to length
  • Variety of materials are available



The Wil-Gard™ detects diaphragm failure at the source: the primary diaphragm, not at the air chamber or the air exhaust as other systems do.

  • Sensors are located between the primary and back-up (containment) diaphragms.
  • When the sensors detect a conductive liquid, an audible alarm, LED and an internal latching relay are activated.
  • Increase containment, reduce fugitive emissions and reduce downtime with 24-hour pump surveillance.
  • Power requirement: 110V AC, 220V AC or 9V DC battery



The PCMI counts pump cycles by sensing the presence of the air valve piston (Turbo-Flo™) or air valve spool (Pro-Flo™).

  • The sensor, located at the air valve and cap, detects the presence of a magnet located at the end of the air valve piston/spool
  • The PCMI registers a complete pump cycle when the piston/spool shifts away from the sensor and subsequently returns to the original position.
  • The PCMI unit has a reset switch located on the face of the PCMI module.
  • PCMI has the ability to be reset from a remote location.

The Wilden pump series consists of the following ranges:



  • ADS: Pro-Flo® Shift, Pro-Flo®, Pro-Flo X™,Turbo-Flo, Accu-Flo™
  • Anti-freezing technology
  • Large solids passage
  • Portable & submersible
  • Screen base options
  • Multiple liquid connections available
  • Lube-free options

Performance Data

  • Sizes: 6 mm (1/4″) through 102 mm (4″)
  • Max. flow rate: 1211 lpm (320 gpm)
  • Max. suction lift: 9.5 m (31.2′) wet, 7.6 m (25.0′) dryMax. disp. per stroke: 4.73 L (1.25 gal)
  • Max. discharge pressure: 8.6 bar (125 psig)
  • Max. solids passage: 35 mm (1-3/8″)



  • ADS: Pro-Flo® SHIFT, Pro-Flo®, Pro-Flo X™, Accu-Flo™
  • All metal bolted construction
  • Higher flow rates
  • Superior containment
  • Anti-freezing technology
  • Portable & submersible
  • BSPT (NPT) or DIN (ANSI) liquid connections available
  • Lube-free operation

Performance Data

  • Sizes: 6 mm (1/4″) through 76 mm (3″)
  • Max flow rates: 1021 lpm (270 gpm)
  • Max suction lift: 9.5 m (31.2′) Wet, 7.6 m (25.0′), Dry
  • Max disp. per stroke: 6.09 L (1.61 gal)
  • Max discharge pressure: 20.6 bar (300 psig)
  • Max size solids: 76 mm (3″)


  • Pro-Flo®, Pro-Flo X™ and Accu-Flo™ ADS available
  • For sanitary applications
  • Multiple sanitary FDA elastomers available
  • Shear sensitive
  • Intrinsically safe options
  • Certifications: FDA, CE, ATEXTEX

Performance Data

  • Max flow rates: 920 lpm (243 gpm)
  • Max suction Lift: 7.6 m (25.0’) Dry, 9.5 m (31.2’) Wet
  • Max size solids: 9.5 mm (3/8”)
  • Sizes available: 13 mm (1/2”) through 76 mm (3”)
  • 316 stainless steel wetted components
  • Tri-clamp™ style connections
  • ATEX Certified
  • Specialist Mining Pumps

Wilden Accessories Manuals

Following are a wide range of installation, engineering, and maintenance manuals for Wilden diaphragm pumps. These can assist you in ordering any spares parts you may require, and assist with any installation and troubleshooting you may encounter.

Wilden Spare Parts


All Pumps have a large stock holding of Wilden spares, including spare parts kits, and will always provide the right solution for you.

Some of the Wilden spare parts can also be used in other air-operated diaphragm (AODD) pumps such as ARO.

The Wilden spares we stock include:

  • Air Valves
  • Balls
  • Bushings
  • Capillary Rod Assembly
  • Check Body
  • Clamp Bands
  • Diaphragms
  • End Caps
  • End Cap O-Rings
  • Expanded PTFE Kits
  • Fluid Section Repair Kits
  • Gaskets
  • Mufflers
  • O-Rings
  • Oil Bottles
  • Pipe Bushing
  • Pistons
  • Retaining Rings
  • Screens
  • Shafts
  • Valve Balls
  • Seats

Wilden Spare Parts Manuals

Following are a wide range of installation, engineering, and maintenance manuals for Wilden diaphragm pumps. These can assist you in ordering any spares parts you may require, and assist with any installation and troubleshooting you may encounter.

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