Alpex-Duo XS

Introduction to Frankische Alpex-Duo XS

Fränkische alpex-duo® XS is an innovative press fitting system designed for secure and efficient drinking water and heating installations. Engineered with cutting-edge materials and smart design features, it ensures leak-proof connections, faster installations, and long-lasting performance. The system combines PPSU (high-performance plastic) and lead-free premium brass, making it a safe and hygienic choice for modern plumbing applications. With no need for calibration and laser-engraved identification, alpex-duo® XS simplifies and enhances professional installations.

PPSU stands for Polyphenylsulfone, which is a high-performance engineering plastic. It's widely used in plumbing and industrial fittings like the Alpex-Duo XS system. Here’s a quick technical summary:

• High temperature resistance – can handle continuous exposure to high temperatures (used up to 95°C in Alpex applications).
• Excellent chemical resistance – resists many aggressive substances found in water and heating systems.
• High impact strength – very tough, reducing risk of damage during transport, installation or operation.
• Hydrolysis resistance – resists degradation when exposed to hot water and steam over long periods.
• Hygienic and safe for drinking water – complies with major drinking water standards (e.g. DVGW, WRAS, EU directives).

Why it’s used in products like Alpex-Duo XS:
Because PPSU combines strength, temperature durability, and chemical resistance, it's perfect for plumbing fittings that require:

• Leak-free connections under pressure.
• Long service life.
• Safe contact with drinking water.
• Stability in both hot and cold water systems.

• Drinking water systems: Certified for safe and hygienic water distribution due to the high orrosion resistance. 
• Heating installations: This range is most ideal for radiators, underfloor heating, and boiler connections.
• New builds & renovations: Reliable for both new installations and system upgrades.
• Multi-storey buildings: Designed to handle the high demands of high-rise water distribution.
• District heating systems: Suitable for use in larger heating networks due to the durability of the materials. 

• Greater Flow Rate: This range has up to 30% larger cross-sectional surfaces, which reduces pressure loss and improves efficiency.
• Leak-Before-Press Function: Ensures a secure connection by visibly identifying unpressed fittings, enhancing safety.
• Premium Material Quality: Made from high-performance PPSU and lead-free brass, ensuring corrosion resistance and long-term reliability.
• No Calibration Required: The three-step installation process (cutting – fixation – pressing) eliminates the need for calibration, saving time and effort.
• Easy Identification: Laser-engraved markings provide clear visibility of the fitting type and size, ensuring quick and accurate installations.
• EXtra Safety (XS) Design: Future-proof technology, ensuring compliance with stringent water and heating industry standards.

• Pipe Compatibility: alpex multilayer composite pipes (16-32 mm outer diameter).
• Operating Pressure: Max. 10 bar.
• Operating Temperature: Continuous use up to 95°C.
• Materials:

           Fittings: PPSU (Polyphenylsulfone) & lead-free brass (CW724R)

           Pressing Sleeves: Stainless steel.

• Pressing Profiles: TH & F profiles ensure versatility with common pressing tools.
• Certifications: Meets strict hygienic and safety standards for drinking water and heating installations.

The alpex-duo® XS system is designed for quick, easy, and secure installation in just three steps:

• Cut the pipe to the required length using pipe cutters.
• Insert the fitting securely without the need for calibration.
• Press the connection using an appropriate press tool (TH/F profile). 

 With its leak-before-press function, installers can quickly identify any unpressed fittings, preventing potential issues before system commissioning.