Nipple PRESS - copper, Cu 18 x 20

Product detailed description

In multi-family residential buildings and commercial structures, heating and plumbing systems often require the connection of copper and plastic piping. Installers working with hybrid systems may need to join ALPEX cross-linked polyethylene (PE-Xc) tubing to copper components. This requires fittings capable of maintaining integrity under thermal expansion and contraction, and ensuring leak-free performance in both hot and cold water applications. Press-fit connections offer a fast, reliable alternative to soldering or threading, particularly in tight spaces or where frequent disassembly is not required.

Such installations typically involve domestic hot water circuits, underfloor heating, or central heating systems. The fitting must be selected based on the nominal pressure rating of the system and the maximum operating temperature. In systems with high thermal cycling, the stability of the joint is critical to long-term performance. The use of press-fit copper nipples ensures compatibility with both metallic and non-metallic piping, avoiding galvanic corrosion risks and simplifying commissioning.

Technical parameters

Installation and connection

The installation process begins with cutting and deburring the ends of the copper and ALPEX tubing to ensure a clean, flat surface. The press nipple is inserted into the copper pipe, followed by the stainless steel sleeve and EPDM O-ring. The ALPEX tube is then pushed onto the other end of the fitting. A pressing tool (IVAR TR 4430) is used to compress the sleeve around the tube wall, forming a secure joint. The press force must be applied evenly and fully to achieve a watertight seal.

Installers should verify that the press tool is correctly aligned with the fitting and that the pressing depth indicator shows full engagement. Common errors include insufficient pressing, misalignment, or using the wrong tool for the fitting size. After installation, the joint should be visually inspected for even compression and absence of deformation. A pressure test should be conducted to confirm the integrity of the connection before final commissioning.

Compatibility and accessories

This press copper nipple is designed for use with ALPEX PE-Xc tubing and copper pipes of matching dimensions. It requires the use of a compatible pressing tool (IVAR TR 4430) for correct installation. Stainless steel sleeves and EPDM O-rings are integrated into the fitting and do not need to be ordered separately. For larger-scale projects, the fitting is supplied in packs of five per bag and 200 per full box, allowing for efficient inventory management and workflow planning.

Technical background for designers

The operating principle of the press connection relies on the mechanical deformation of the stainless steel sleeve around the outer wall of the pipe. This creates a rigid, gas-tight joint without the need for heat or solvents. The nickel-plated brass body provides corrosion resistance and dimensional stability, while the EPDM sealing ring compensates for minor tolerances and prevents leakage. When integrated into a system, the fitting must be aligned with the thermal expansion characteristics of the connected piping to avoid stress-induced failures. Long-term performance is influenced by the quality of the pressing operation and the uniformity of the joint interface.

Service and operation

During normal operation, the fitting requires no maintenance. However, periodic visual inspections are recommended to detect signs of mechanical stress, corrosion, or leakage. If a press joint becomes damaged or fails, the affected section must be cut out and replaced with a new fitting. No specific service intervals are required for this component under standard operating conditions.

Frequently asked questions

Can this fitting be used for both hot and cold water applications?
Yes, the operating temperature range includes both hot and cold water systems, provided the pressure remains within the PN 10 limit.

Is it necessary to use the IVAR TR 4430 pressing tool specifically for this fitting?
Yes, the pressing tool must be compatible with the fitting’s dimensions and pressing requirements to ensure a secure joint.

Can this fitting be used in radiant floor heating systems?
Yes, provided the system operates within the specified pressure and temperature limits and the installation follows standard press-fit procedures.

What should be done if the pressing tool does not engage fully during installation?
Check the alignment of the tool with the fitting and ensure the pressing depth indicator is fully engaged. Re-pressing may be required after correcting the issue.