Blagdon B25 FDA Approved Diaphragm Pump

  • Max. Capacity 180 l/min

  • Max. Pressure 8.6 bar

  • Max. Viscosity 5,000 cP

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

Blagdon B25 FDA Approved Diaphragm Pump

Blagdon Air Operated Double Diaphragm Pump. Self-Priming Bulk Transfer Pump.

Hygienic Pharma and Food grade pump.

Fully Submersible Pump. Up to 180 l/min,


1" & 1.5" Air Operated Diaphragm Pump

FDA Approved Materials Construction 

Blagdon Air-Operated Double Diaphragm (AODD) Pumps provide high performance, reliable solutions for your pumping needs. They specalise 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 in to the markets of Ireland and Northern Ireland.

Common applications:
  • For applications requiring FDA Approved materials
  • Pharma and Food Grade application
  • Low cost, straight forward constuction
  • When electrical power is not available
  • Noise sensitive areas


Pump type: Air Operated Double Diaphragm Pump
Control: Valve in air inlet (not included) 
Materials: Electropolished 316L Stainless Steel casing (see options)
Fluid Connections: 1" or 1.5" (see options)
Max Solid diameter: 3 mm
Max Flow rate: 180 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 (Electro-Polished)
Construction Materials: 316L Stainless Steel / Aluminium (22.5kg), 316L SS / 316L SS (32.5kg)

Internal material options: Nitrile, EPDM, Neoprene, Santoprene, PTFE, Viton
Fluid Connection options: 1" to 1.5" 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.