The multilayer system of excellence.
Pexal® is composed of multilayer pipes and different types of fittings that are chosen according to the installation technique adopted.
There are various applications: from the distribution of hot and cold drinking water to centralised water supply systems, from radiator and fan heating systems to radiant floor, wall and ceiling heating and cooling systems, from compressed air systems to industrial plants.
Resistance to corrosion
The total resistance to corrosion, to construction materials and the main chemical compounds allow it to be used in a wide variety of applications, both residential and industrial.
The combination of crosslinked polyethylene and aluminium guarantees excellent flexibility when bending (also when bent manually) and dimensional stability in the long term
Excellent acoustic insulation
The elastic nature of the crosslinked polyethylene allows excellent absorption of vibrations and therefore an excellent acoustic insulation.
Reduced pressure loss
The extremely smooth internal surface, as well as preventing the formation of deposits such as lime scale, ensures reduced pressure loss also with the passage of time.
Guaranteed durability of at least 50 years
The system has a guaranteed durability of at least 50 years in compliance with product standards; in this period the product can be used at pressures of 10 bar and temperatures as high as 95°C.
The range of fittings, accessories and relative tools is extremely wide and allows all requirements to be met. The fittings are available both in metal and in technopolymer to cover different system applications.
Barrier against oxygen and light
The butt welded aluminium layer acts as a total barrier against oxygen and light, which in plastic pipes would otherwise favour algae growth and the corrosion of the metal parts that make up the system.
The system is made up of materials that are completely non-toxic and is certified for the transport of consumable fluids and drinking water.
Lower thermal expansion
Thermal expansion is approximately 8 times lower than all-plastic pipes and is similar to the expansion in metal pipes.
Ideal solution in areas subject to earthquakes
It is the ideal solution in areas subject to earthquakes thanks to the excellent mechanical properties such as flexibility and the capacity to alleviate vibrations.
Wide range of diameters
Wide range of diameters from De 14 mm to De 90 mm
Light in weight
The pipes are extremely light in weight as compared with metal pipes: weight is 1/3 of a similar copper pipe and is 1/10 of a similar steel pipe.
Pexal® multilayer system is suitable in renovations as well as new buildings such as shopping centres, hospitals, offices, schools, multistorey residential buildings, and industrial plants.
Thanks to their excellent qualities they can be used in surface mounting for any type of system:
- supply of high and low temperature water to radiators;
- supply of hot and refrigerated water to fans;
- distribution of hot and cold water;
- radiant floor, wall and ceiling heating and cooling systems;
- central heating stations;
- distribution of compressed air;
- laboratories, technical and industrial plants in general
A solution for all requirements
The range is composed of pipes supplied in straight lengths (up to diameter 90 mm for the Pexal® pipe) and in coils (up to diameter 32 mm) of various lengths, from 50 m up to 200 m.
The Valsir multilayer pipes can also be supplied with a protective corrugated covering, either in red of blue and can be pre-insulated with a flame retardant layer in grey, blue or red.
There are different methods for the production of multilayer pipes and they differ mainly in the technology used in forming the aluminium pipe. It can be formed by overlapping, overlapping and welding, or by butt connection and welding
The latter is the technology chosen by Valsir in that it guarantees a uniform thickness across the entire circumference, greater resistance to pressure and bending, uniform mechanical characteristics, greater adhesion values with the bonding layers and a total barrier to oxygen.
The crosslinking process can be performed using different technologies, recognised by International standards and identified as follows: A (peroxides), B (silanes), C (radiation), D (azo-compounds); the method used is indicated together with the abbreviation for the material, thus obtaining PE-Xa, PE-Xb, PE-Xc, PE-Xd.
There is much conflicting information in the market as to which is the best technology; however, it is not the type of crosslinking process that determines the quality of the pipe but the capacity to produce it in compliance with all the relevant quality standards which are applied to all four of the abovementioned crosslinking methods.