Gasketed plate heat exchangers


Industrial semi-welded GPHEs

Industrial semi-welded gasketed plate heat exchangers are used when gaskets are not suitable as one of the process media. Semi-welded GPHEs can also take a higher design pressure compared to fully gasketed plate-and-frame heat exchangers.

In the Semi-welded heat exchanger the refrigerant flows in laser-welded, sealed plate channels, and in the opposite channel the liquid brine flows in gasketed channels.


Semi-welded GPHEs are used in refrigeration applications as:

  • Evaporators
  • Condensers
  • Desuperheaters
  • Cascade duties
  • Economizers/subcoolers


  • Easy to modify heat transfer area for altered capacities, refrigerants
  • Condenser/desuperheater or condenser/oil cooler combined in single unit
  • Special high pressure version available for CO2 cascade duties
  • Special fitted Surge drum available for flooded NH3 evaporator application
  • Can be optimized with air liquid coolers in indirect cooling systems


How it works






The Industrial semi-welded line can be configured in many ways. The animation shows single pass configuration of a fully gasketed plate-and-frame heat exchanger. The flow principle of a semi-welded heat exchanger is the same. The difference is that every second channel is sealed with a laser weld instead of a gasket. Multi pass with 2 or more passes on each side is also possible. 

Liquid/Liquid GPHE

Steam heater GPHE

2-pass GPHE


Features that matter


RefTight sealing system

What is it?

The sealing weld is positioned separately - outside the ring gasket, which ensures equal sealing force over the entire port hole gasket, guaranteeing higher performance through the welded channel.

Risks with other designs

The sealing weld is commonly placed inside the ring gasket groove. This combined with an uneven port hole groove can lead to gasket material stress and can eventually lead to gasket failure.

Distribution system - CurveFlow

What is it?


Risks with other designs


ClipGrip gasket

What is it?


Risks with other designs



Servicing your heat exchangers


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