over 50 years in heat transfer specialist in fully welded plate heat exchangers
Česky English
Breadcrumb navigation

Home > Products > Plate heat exchangers with seals

Plate heat exchangers with seals

Demountable plate heat exchangers with seals are designed primarily for heating or cooling media. They are mainly used in plants where it is necessary to control and clean the indoor environment such as the food industry. We are one of the leading suppliers and manufacturers of demountable API Schmidt Bretten heat exchangers. We currently offer several types of demountable heat exchangers. These differ in the size of the heat exchange surface and the flow rate which are the main parameters influencing the overall performance of the exchanger. The smallest type of demountable heat exchanger in our production program is the SIGMA M7 (Si7) model and conversely the largest model is the SIGMA M306 (Si306).


If you are required to design an exchanger for a given application, we will be happy to provide you with a calculation that is performed with high accuracy using calculation programs.

Ask for a quotation


Overview of all manufactured demountable heat exchangers:

 Model Max. flow rate [m3/hour] Heat transfer area [m2]
 Si7 15 5,7
 Si9  15 12,7
 Si13  80 29,6
 Si16  20 23,6
 Si19  50 46
 Si22  40 46,8
 Si25  200 138,2
 Si26  80 98,3
 Si27  80 92,8
 Si29  200 158,9
 Si32  70 127,1
 Si35  200 153,8
 Si36  120 168
 Si37  120 168
 Si38  200 72,7
 Si45  200 70,2
 Si48  600 187
 Si49  200 173
 Model Max. flow rate [m3/hour] Heat transfer area [m2]
 Si52  225   249,4 
 Si55  720  233,0
 Si56  720  357,0
 Si60  400  178,8
 Si66  320  350,7
 Si76  720  702,2
 Si85  320  406,7
 Si96  720  933,6
 Si106  750  608,9
 Si108  750  590,6
 Si114  750  607,2
 Si136  750  856,8
 Si138  750  850,7
 Si149  2000  1013,1
 Si156  2000  1135,9
 Si206  4000  1236,0
 Si229  2000  1252,5
 Si306  4000  1866,0 




Overview of the size of heat exchange surfaces of demountable exchangers and their flows.

Heat transfer area from 0,3 up to 1.866 m2.

Volume flows from 15 up to 4.000 m3/h.


Cleanable heat exchangers and their easy maintenance

Demountable heat exchangers differ from welded plate heat exchangers mainly in that the heat exchanger can be easily disassembled, cleaned and reassembled at any time. Instead of a solid weld, a seal is used for the heat exchangers. The exchanger consists of a set of heat exchange plates with seals, partitions and pressure plates tightened with tightening screws. This makes it easy to replace any heat exchanger plate or seal. Demountability and therefore cleanability of exchangers is their great advantage. Cleaning can be performed chemically (by chemical flow) or mechanically.


Principle of detachable heat exchanger with seal

The detachable plate heat exchanger consists of a set of plates arranged in series and tightened by means of screws between the fixed and the pressure plate. Each of the plates is provided with a seal thus creating a system of separate channels for the flow of the primary and secondary medium. The plates are pressed so that intense turbulence occurs in the flowing medium which increases the heat transfer. It is possible to say that our plate heat exchangers have 3 times higher efficiency than tubular heat exchangers.

  • 1) main stand of the demountable plate heat exchangers
  • 2 – 7) plates with the seals
  • 8) frame/cover
  • 9) suspension rod
  • 10) rear stand
  • 11) quid rod
  • 12) tightening screws

obrazek desek



SIGMA plates as basic modular elements play a major role in the excellent thermodynamic properties of heat exchangers. The media paths in the plate set depend on the thermodynamic requirements for the exchanger by the customer. To meet customer requirements and operating conditions of the technology SIGMA boards with several pressing variants are used. By combining differently perforated plates and size variations with parallel or serial arrangement of intermediate plate channels, optimal parameters in the operation of the device are achieved.



Technical parameters of the most frequently used SIGMA boards:  



Examples of board corrugation:

Obrázek3.jpg Obrázek2.jpg 3.jpg

Different types of corrugation boards are used mainly for the following reasons:

  • media with different density and viscosity (e.g. water x honey)

  • required pressure drop

  • better heat transfer, etc.


Technical parameters and use of plates for pasteurizers:



Technical parameters and use of plates for heaters and coolers:


Material of demountable plate heat exchangers with seal

The composition and temperature of the media during heat exchange determine the material from which the boards are made. We are currently able to offer boards from the following types of material:

  • stainless steel DIN 1.4301, DIN 1.4404, DIN 1.4539, DIN 1.4571, DIN 1.4547
  • nickel alloyes DIN 2.4819, DIN 2.4610
  • titanium alloyes DIN 3.7025 Gr.1, Gr.2



When using a heat exchanger with a seal, it is necessary to follow certain rules depending on the temperature and the type of medium used. If the temperature is constantly exceeded the seal ages rapidly.

Type of seal Max. temperature Application
NBR  130 °C oil, water, food industry
EPDM  160 °C hot water, acids, food industry 
Viton  180 °C aggressive chemicals, oils, fats 
AFM  190 °C oils 
PTFE  260 °C aggressive chemicals 







The seal is attached to the plate either by gluing with special adhesives or by a mechanical "click" fastening system.



The heat exchanger racks are designed for different operating pressures. The surface treatment of all-stainless steel stands is done by polishing or ballot paper or in the case of carbon steel stands with a surface protected by paint, shade RAL 7001.  



Depending on the needs of operation technology requirements and EU standards the exchangers can be equipped with tanks, deodorizers, hot water circuits, steam mixers, pumps, fittings, reamers, test taps, etc.



Direct connection on the front plate, clamp connection, flange connection, threaded connection, aseptic connection or connection with a pipe thread, "O" ring, other sockets according to DIN, ASME, etc., socket size DN25 to DN400.


Advantages of our demountable plate heat exchangers with seals

Demountable plate heat exchangers with seals are easy to maintain and clean or they can be supplemented with additional plates when increasing or decreasing the transmitted power is required. The construction is detachable and thus allows easy replacement of plates or seals. Our exchangers are made of quality material so they can work even in demanding industrial conditions.

Mains area of application::

  • food industry

  • pasteurizers for milk and cream

  • pasteurizers of viscous food media - egg contents, kefir, ketchup, milk creams, spreads, butter, fruit pot baby food etc.

  • pasteurizers of beer and carbonated fruit drinks CO2

  • heaters

  • coolers

  • heat exchangers for waste water