AEV Expansion Tanks

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  • Summary
  • ApplicationsClosed Loop Heating and Cooling circuits 
  • Description

    Expansion tanks use compressed air to maintain system pressures by accepting and expelling the changing volume of water as it heats and cools. Diaphragm or bladder tank designs isolate the expanded water from the pressure controlling air cushion – which is pre-charged at the factory and can be adjusted in the field to meet final system requirements

  • Materials
    • Carbon steel tank with Butyl Bladder, Rubber Diaphragm
  • Performance RangeAEV LD – up to 6 bar, AEV MB - 10 bar and AEV HB -16 bar applications.
  • Temperature

    -10 to 100 deg C

  • Size

    8 Liters to 1000 liters

Low operating cost and risk

  • Nitrogen gas filling for longer retention of pre-charge
  • Stabilizes system pressure, maintaining optimum levels of a critical operating parameter.
  • Eliminates air ingress and dampens pressure transients (water hammer) for reduced system corrosion and stress, ultimately extending service intervals and overall system life



  • The fixed bag-type diaphragm prevents the water to come in contact with the bare steel of the vessel 

Easy Maintenance

  • Replaceable butyl rubber bladder according to din4807/5.
  • With single threaded coated steel connection (no flow-through function).