Blagdon B25 Non-Metallic Diaphragm Pump

  • Max. Capacity 152 l/min

  • Max. Pressure 8 bar

  • Max. Viscosity 5,000 cP

  • Temperature Range Limited by elastomers - Up to 180 deg C.

Blagdon B25 Non-Metallic Diaphragm Pump

Blagdon Air Operated Double Diaphragm Pump. 

High Suction, Acid Pump and Corrosive liquid pump.

Fully Submersible Pump. 


Up to 152 l/min

1" Air Operated Diaphragm Pump

Non-Metallic Construction 

Blagdon Air-Operated Double Diaphragm (AODD) Pumps provide high performance, reliable solutions for your pumping needs. They specialise in extreme condition environments and applications...keeping your process moving both above and below ground. Their AODD pumps have long been recognised as the "work horse" of the industry for handling difficult liquids at relatively low pressures and flows. The range of applications is virtually limitless! 
The pump chambers are alternately filled and emptied by drawing fluid in through a common (suction) inlet, and out through a common (discharge) outlet. The diaphragms in each chamber are linked by a common shaft so that they move backwards and forwards in unison. Compressed air is directed by the air valve alternatively, behind each diaphragm, to power discharge strokes. Pump speed, fluid output and pressure (or head) is controlled by increasing or decreasing the flow of compressed air to the pump.
Common applications:
For corrosive liquids and chemicals
When metallic contact is not acceptable
Low cost, straight forward construction
When electrical power is not available
Noise sensitive areas


Pump type: Air Operated Double Diaphragm Pump
Control: Valve in air inlet (not included) 
Materials: Non-metallic casing (see options)
Fluid Connections: 1" (see options)
Max Solid diameter: 3mm
Max Flow rate: 152 litre/min
Max Discharge pressure: 8 bar
Air Inlet: 3/8" BSP (F) or NPT (F)
Pump weight: see options


  • Simple construction, easy to maintain & control
  • Self-priming, ideal for emptying containers
  • ATEX approved as option - intrinsically safe
  • Low break-out pressure
  • Reliable, proven pneumatic air valve
  • Strong, robust design
  • Manufactured in Shannon, Ireland


Casing materials: Polypropylene, Conductive polypropylene, PVDF
Construction Materials: Polypropylene/Aluminium (13.5kg), PVDF/Aluminium (18kg), Polypropylene/Stainless Steel (18kg), PVDF/Stainless Steel (20kg)

Internal material options: Nitrile, EPDM, Neoprene, Santoprene, PTFE, Viton (FKM), Polypropylene
Fluid Connection options: 1" ANSI #150 RF or DN15 DIN Compatible Flanges

Like all air operated diaphragm pumps, this pump requires a compressed air source to function.
Need a compressor and pump combo? Check out the compressors in the "Other Products" menu tab.