Blagdon B40 Metallic Diaphragm Pump

Max Capacity: 320 l/min

Max Pressure: 8.6 bar

Max Viscosity: 5,000 cP

Temperature Range: Limited by elastomers - Up to 180 deg C

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Blagdon Air Operated Double Diaphragm Pump. 

Fully Submersible Pump. 

Atex certificate available.

Up to 320 l/min,

1.5" Air Operated Diaphragm Pump, 

Metallic Construction suitable for "Work-horse" applications

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. offers Blagdon Air Operated Diaphragm Pumps to the markets of Ireland & Northern Ireland.

Common applications:

  • Vast range of liquids and chemicals
  • Optional Atex certification available
  • Low cost, straight forward construction
  • When electrical power is not available


Pump type: Air Operated Double Diaphragm Pump

Control: Valve in air inlet (not included) 

Materials: Metallic casing (see options)

Fluid Connections: 1.5" Threaded (see options)

Max Solid diameter: 6mm

Max Flow rate: 320 litre/min

Displacement: 1.2 litres/stroke

Max Discharge pressure: 8.6 bar

Air Inlet: 3/8" BSP(F) 

Pump weight: see options list


  • Simple construction, easy to maintain & control
  • Self-priming, ideal of emptying containers
  • Bolted construction for greater integrity
  • ATEX approved as option – intrinsically safe
  • Reliable, proven pneumatic air valve
  • Strong, robust design
  • Manufactured in Shannon, Ireland


Casing materials: Aluminium/Aluminium (23kg) 

Internal material options: Nitrile, EPDM, Neoprene, Santoprene, PTFE, Viton (FKM)

Fluid Connection options: 1.5" BSP (F) or NPT (F) Threaded
Other Options: Weighted valve balls for high viscosity liquids

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. 


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