Press nipple - reduced, 40 x 20

Product detailed description

Press nipples are essential components in systems where ALPEX pipes of different diameters need to be joined. This reduced press nipple is commonly used in residential and commercial heating and plumbing installations. It ensures a secure and leak-free connection between pipes of different sizes within the same system. Installers working with pre-insulated PE-Xa pipes benefit from the ease of installation and reliable performance of press fittings.

Typical applications include domestic hot and cold water supply lines, underfloor heating circuits and central heating distribution systems. The fitting supports system integrity under normal operating conditions and allows for quick assembly using standard pressing tools compatible with B-F-TH jaws.

Technical parameters

The nominal pressure rating PN 10 indicates the fitting is suitable for systems operating at pressures up to 10 bar at reference temperature. The maximum operating temperature of +120 °C makes it appropriate for hot water circuits. These parameters are critical for correct sizing and selection to ensure long-term performance and safety in the intended application.

Installation and connection

This press nipple is sized for 40 mm outer diameter pipe on one end and 20 mm on the other. The fitting is installed by inserting the prepared pipe into the fitting until it reaches the stop mark. A pressing tool with jaws of type B-F-TH is then used to compress the stainless steel sleeve around the pipe. Before pressing, ensure the pipe is clean and free of burrs. A common mistake is incorrect positioning of the pipe within the fitting, which can lead to incomplete compression and leaks. Always verify the depth of insertion and confirm the pressing tool is correctly aligned with the fitting axis.

Compatibility and accessories

This fitting is specifically designed for use with ALPEX PE-Xa pipes. It requires a pressing tool compatible with B-F-TH jaws for proper installation. No additional accessories are required for standard installation. Ensure the tool is calibrated and maintained according to the manufacturer’s instructions to achieve consistent results.

Technical background for designers

The press nipple operates by mechanically securing the pipe within the fitting through radial compression of the stainless steel sleeve. The nickel-plated brass body provides corrosion resistance and dimensional stability. The EPDM sealing ring ensures a tight seal against fluid leakage. When integrated into a system, the fitting must be selected based on the pipe size, system pressure and operating temperature. The material properties of CW617N brass and the sleeve’s stainless steel composition contribute to the fitting’s durability and resistance to thermal cycling. Proper alignment and support during installation help prevent stress concentrations that could affect service life.

Service and operation

Once installed, this fitting requires no routine maintenance. During system operation, it is important to monitor for signs of leakage or discolouration at the joint. If a fault is suspected, the system should be depressurised and the fitting inspected for damage. There are no defined service intervals for this component under normal operating conditions.

Frequently asked questions

Can this press nipple be used with non-ALPEX PE-Xa pipes?
No, the fitting is specifically designed for ALPEX PE-Xa pipes. Using it with incompatible materials may compromise the integrity of the joint.

Is this fitting suitable for hot water systems?
Yes, the operating temperature limit of +120 °C makes it suitable for hot water applications such as domestic hot water supply and underfloor heating.

What pressing tool is required for installation?
A pressing tool with jaws of type B-F-TH is required to compress the stainless steel sleeve around the pipe.

Can this fitting be used in a closed-loop heating circuit?
Yes, provided the system operates within the specified pressure and temperature limits of PN 10 and +120 °C.