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Expansion system

ApplicationExpansion system

Expansion system is an automatic device for maintaining the pressure in the warm and hot water system of heating. The device enables the reception of water surplus, which appears during the water warming in the installation of central heating. It also enables replenishment of central heating installation during cooling or water shortages in the installation because of the system losses and  bottom blow of boilers or heat exchangers.

The device can be applied in the systems of the warm and hot water installation of the central heating with capacity goes from 350 kW up to 24 MW in 11 sizes and 14 designs with operating pressure 5 bar.

In accordance with the DIN 4751 requirements, Part 2 for installation of capacity more than 350 kW the expansion system of this type is obligatory for use.

Device characteristics:

  • automatic work
  • reliability in operation
  • noiseless
  • small dimensions
  • easy installations
  • simple for transport
  • minor costs of maintenance
  • guarantee is valid 12 months after putting into operation or maximum 15 months after delivery date.

Production range

In its production range, the ITG offers an expansion systems, which are different in size and number of vessels as well as number of pumps. That depends on the conditions of installation and operation in the heating system.

To order the following data are necessary:

capacity of the installation kW
volume of water in the installation m3
temperature of water in the installation (start/return) ......../........oC
operating pressure in the installation bar
number of boiler units pcs
connection of the softened water (left/right)
required number of vessels regarding the conditions during installation pcs

Technical documentation:

  • process flow sheet
  • wiring diagram
  • arrangement of the device elements
  • pressure test reports
  • instruction for installation, operation and maintenance
  • guarantee
  • EC - Declaration of conformity

This device, by its conception, design and testing in practice as well, contents all requirements of EU norms in accordance with the DIN 4751-2, VDE 0116: 1989-10 and Machinery directives 98/37/EEC.

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