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Machines & equipment for sale

Wilden Heavy Duty Non-metallic Diaphragm Pump

Special Offer

Refurbished Price [?]
£ 475 (+ VAT)
Special Price (refurbished) [?]
£ 400 (+ VAT)
Special Price (sold as seen) [?]
£ 200 (+ VAT). Available for immediate collection.
Special offer ends
23 January 2020 16:00 GMT while stocks last
Excellent Condition
Stock No
Diaphragm pump
Other Info
Chemical resistant self priming pumps
Our Central Warehouse, Aldridge, UK
External Dimensions (WxDxH mm)
400 x 380 x 700


We always carry a wide selection of air operated diaphragm pumps usually ranging from 1/2" to 2" and in differing chemical resistances and materials of manufacture. 

Diaphragm pumps explained:

A diaphragm pump (also known as a Membrane pump, Air Operated Double Diaphragm Pump (AODD) or Pneumatic Diaphragm Pump) is a positive displacement pump that uses a combination of the reciprocating action of a rubber, thermoplastic or Teflon diaphragm and suitable valves either side of the diaphragm (check valve, butterfly valves, flap valves, or any other form of shut-off valves) to pump a fluid.

There are two main types of diaphragm pumps:

Those in which the diaphragm is sealed with one side in the fluid to be pumped, and the other in air or hydraulic fluid. The diaphragm is flexed, causing the volume of the pump chamber to increase and decrease. A pair of non-return check valves prevent reverse flow of the fluid.[1]

Those employing one or more unsealed diaphragms with the fluid to be pumped on both sides. The diaphragm(s) again are flexed, causing the volume to change. When the volume of a chamber of either type of pump is increased (the diaphragm moving up), the pressure decreases, and fluid is drawn into the chamber. When the chamber pressure later increases from decreased volume (the diaphragm moving down), the fluid previously drawn in is forced out.[3] Finally, the diaphragm moving up once again draws fluid into the chamber, completing the cycle. This action is similar to that of the cylinder in an internal combustion engine.

Diaphragm pumps

Your Needs

  • Must be reliable
  • Must be durable
  • Ease of maintenance
  • Submersible
  • Keep it cost effective


  • Clamped wetted path design
  • Proven air distribution systems
  • Progressive diaphragm technology
  • Portable models

The Results

  • Trouble free operation
  • Utilitarian pumps
  • Lower operational costs & downtime
  • Longer MTBF (Mean Time Between Failure)
  • Your Success


Diaphragm  pumps were specifically designed for maximum performance and efficiency. They have the advantage of being self priming, will handle solids in the solution without jamming or damaging the seals, are easy to control and can achieve high pressures for such applications as lift pumps and pressure pumps for sludge pumping. The bolted configuration of these pumps ensures total product containment while the redesigned liquid path reduces internal friction to maximize output and efficiency.

Diaphragm pumps 

Your Needs

  • Maximize containment
  • Increase On/Off reliability
  • Lower the cost of operation
  • Increase flow rates
  • Keep it cost effective

Our Solution

  • Advanced wetted path designs
  • Proven air distribution systems
  • Progressive diaphragm technology
  • Leak-free operation throughout the pump's life

The Results

  • Achieve higher yields
  • Increase pump performance
  • Lower operational costs & downtime
  • Longer MTBF (Mean Time Between Failure)
  • Your Success

Typical details of the 2" Wildon pumps shown;

(Water Chambers and Manifolds)
Material Ship Wt
Polyproylene 24 kg (52.0 lbs)
Description Material
Center Block Polypropylene
Air Chambers Polypropylene
Air Valve Polypropylene
5.5 m (18.2') Dry, 9.3m (30.6') Wet
4.76 mm (3/16")

Price and availability on request

pdf icon Print / Download Wilden Heavy Duty Non-metallic Diaphragm Pump Datasheet

Additional files

Photographs taken prior refurbishment. Our refurbishment service is not available on all machines.