Aquasystem Watertech

VRV 300 ltr. membrane expansion tank heating pressure expansion tank VR MAG


Item number 40294

01.01.1970

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Structure of the pressure expansion vessel


The expansion tank with exchangeable membrane is suitable for heating and cooling systems. The vessel provides the necessary space to compensate for the expansion of the heating water by increasing the temperature and thus avoids damage to the system.

  • Volume 300 litres
  • Operating temperature -10 °C to 100°C
  • Colour RAL 3000 (red)
  • Rubber membrane made of EPDM
  • Counterflange galvanized
  • vessel with feet
  • Inlet pressure 1.5 bar

How it works


After commissioning the diaphragm pressure expansion vessel, it takes over the function of regulating the water expansion in heating mode.


At max. temperature and pressure load of the diaphragm it occupies almost the entire interior. The membrane prevents any contact of the heating water with the surface of the vessel.


When the temperature drops, the water valumen is reduced. The counterpressure in the vessel forces the heating water in the membrane back into the system. Samit a stable pressure of the plant is ensured. This process is repeated constantly during operation of the system.

Technical data

model Height (mm) Diameter (mm) Max. operating pressure blank Connection
VR12 295 280 8 1,5 3/4"
VR18 430 280 8 1,5 3/4"
VR24 483 280 8 1,5 3/4"
VRV35 450 365 8 1,5 3/4"
VRV50 582 365 8 1,5 3/4"
VRV60 668 365 8 1,5 3/4"
VRV80 717 415 8 1,5 1"
VRV100 675 495 8 1,5 1"
VRV150 790 550 8 1,5 1"
VRV200 1085 600 8 1,5 1"
VRV300 1212 650 8 1,5 1"