Blagdon B25 Hygienic Diaphragm Pump

  • Max. Capacity 136 l/min

  • Max. Pressure 8.6 bar

  • Max. Viscosity 5,000 cP

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

Blagdon B25 Hygienic Diaphragm Pump

Blagdon Air Operated Double Diaphragm Pump. 

For hygienic and sanitary applications in Pharma and food industries.

Fully Submersible Pump. 

Up to 136 l/min,

1" Air Operated Diaphragm Pump

Hygienic / Food Grade 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.
Thomson Process Equipment & Engineering Ltd. supply Blagdon pumps into the markets of Ireland and Northern Ireland.

Common applications:

  • For Hygienic and Sanitary applications
  • Pharma and Food Grade application
  • 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: Polished 316L Stainless Steel casing (see options)
Fluid Connections: 1" (see options)
Max Solid diameter: 5mm
Max Flow rate: 136 litre/min
Max Discharge pressure: 8.6 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
  • Non-stalling valve & shuttle design
  • Manufactured in Shannon, Ireland


Casing materials: 316L Stainless Steel (Polished)
Construction Materials: 316L Stainless Steel / 316L Stainless Steel (21.5kg)

Internal material options: PTFE, EPDM/FDA
Fluid Connection options: 1" RJT or Triclamp ports

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.