Product Detail


Range of energy-efficient plate heat exchangers.  Suitable for various ranges of commercial and industrial applications









Sondex plate heat exchangers have unique metal plate patterns manufactured with sloping lead grooves to guarantee a good distribution of the liquid.

The choice of the plate patterns has been designed to optimize the heat transmission efficiency. Sondex currently offer four different types of heat exchangers.

Plate and Frame Heat Exchangers

-      Plate Heat Exchangers

The plate heat exchanger consists of a frame, which consists of a head, follower, column, carrying bar, guiding bar, and a number of clamping bolts. In between head and follower a varying number of pressed plates are clamped together.

Each plate is supplied with a gasket, so that the plates form a closed system of parallel flow channels, through which the media flow alternatively at every second interval.

-      The Plate Stack - Medie

The gaskets are glued on the plates, securing tightness between medias and the atmosphere. Between the different media there are double gaskets, which have intermediate drain areas, meaning that mixing of the two media is impossible.
Every second plate in the stack has to turn 180°, so that the plates form a closed system of parallel flow channels, through which the media flow alternatively at every second interval.

-      Gasket Construction - New Gaskets

The first plate after the head and intermediate frames is mounted with a gasket in all the gasket grooves. These gaskets are cut out of ordinary gaskets.

-      Glue Less or Glued Gaskets

Some plate heat exchangers are delivered with glue less "Sonder Snap" gaskets. In these units it is possible to change the gaskets without using glue. However, the gasket on the first plate after the head and intermediate frame should be glued on in the pattern displayed above.

All Welded Plate & Shell Exchanger

-      Design and Function of the Heat Exchanger:

This heat exchanger works in the same way as an ordinary tubular unit, however, it is more efficient because plates have been used instead of tubes. The plates are laser/TIG welded together to form a plate pack, which is then mounted inside a traditional cylindrical shell.

-      The Advantages of this Heat Exchanger:

  • No gaskets
  • Safe operation without risk of leakage
  • High working temperatures up to 250°C
  • High working pressure up to 25 bar
  • High K-values
  • Small liquid hold up volume
  • Small space requirement (only 30% of a traditional tubular heat exchanger)
  • Easily serviced

-      Applications for SONDEX All Welded Plate and Shell Heat Exchanger:

  • District heating
  • Steam heating
  • Thermal oil heating
  • Evaporator for refrigerants
  • Condenser for refrigerant

Sondex Brazed Plate Heat Exchanger

-      High temperature and pressure:

The brazed plate heat exchanger does not contain rubber gaskets and can thus operate continuously at temperatures from minus 180 degrees C up to plus 200 degrees C. The operating pressure can be as high as 30 bar.

-      Plate requirements:

The design of the brazed plate heat exchanger provides a lightweight heat exchanger which in most cases can be mounted directly on the piping without supports.

-      Minimum temperature difference/great thermal efficiency:

The high turbulence degree of each plate compared to all other heat exchanger types makes quick temperature changes possible. The SONDEX brazed plate heat exchanger is available with insulation. The SONDEX brazed plate heat exchanger can be utilized for heating and cooling of clean liquids which must not contain particles and dirt larger than one millimetre in size which would result in blockage.
Furthermore, the SONDEX brazed plate heat exchangers are suitable as evaporator and condenser units.

-      Typical applications are:

  • District Heating/Heating and Ventilation
  • Solar Heating and air-conditioning units
  • Heating pumps and heat recovering units
  • Hydraulic and fuel oil units
  • Construction and mode of operation

-      SONDEX brazed plate heat exchanger consists of:

A number of thin, acid-resistant plates, precision stamped and assembled as a unit, each alternate plate being rotated 180°. The plate pack, assembled with two end plates and connections, is vacuum brazed at extremely high temperatures providing a permanently sealed heat exchanger.

The final result is a strong and compact plate heat exchanger with extremely high heat transmissions. The high heat transmission comes from the main pattern which is designed to create a turbulence flow. The strong turbulence prevents or minimizes blockages in the heat exchanger. Should the liquid or stream used cause restrictions, the plate heat exchanger can be rinsed with cleaning agents according to the specifications in the Installation, Operation and Maintenance Manual.

Sondex Free Flow Plate

The plates have been designed without any metal contact between the plates and are specially designed for products, containing pulp and other fibrous material up to 2 mm in diameter and a length of up to 5 mm.

The flow is unimpeded and has a gap of up to 5 mm, meaning that particles will not be caught in the plates. The Sondex Free Flow Plate Heat Exchanger can easily be maintained and cleaned without dismantling by cleaning in-place (CIP).

The physical length of the PHE means that many applications can be solved in one pass solutions with all the connections on the fix end plate only.

-      Advantages:

  • Real Free Flow Plates without any metal-to-metal contacts at all.
  • Can be used for fibrous material.
  • CIP cleaning is possible.
  • Very high thermal performances.
  • Strong and rigid plate material.
  • Sondex patented hanging system which ensures correct assembling of the plate pack year after year.
  • The plates and gaskets comply fully with the US 3A sanitary standard.

-      Areas of applications:

  • Cooling/heating of fibrous material, like juice, containing pulps.
  • Pasteurizing cream and viscous ice cream mixes.
  • Heat treating and cooling yoghourt.
  • Cooling wort with mash.
  • Cooling mustard and tomato sauces.
  • General heat treatment of pumpable foodstuffs.
  • Heat treatment of milk products, requiring a very gentle heat treatment.
  • Heat recovery from industrial applications, containing impurities, wasting water, cellulose, etc.

Information last verified 18th February 2011

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