SiGMA-Li SIGMA LI welded elbow 20×45° PE-RT for piping connections

SiGMA-Li welded elbow 20×45° in PE-RT material is designed to create a stable, fixed-angle change in piping runs for heating and plumbing systems. The 20 mm diameter fitting provides a 45° bend and is suitable for integration into PE-RT pipe networks where fusion or press welding is used. It is intended for residential and light-commercial distribution applications where reliable directional changes and leak-proof joints are required.

Advantages

The SIGMA LI welded elbow is manufactured from PE-RT to offer dimensional stability at raised temperatures and compatibility with common PE-RT piping. Its welded construction enables tight joints when correctly fusion- or press-welded, reducing potential points of leakage. The compact 45° profile simplifies routing in constrained spaces compared with a longer multi-piece bend.

Suitable for

• Domestic underfloor heating manifolds and branch connections
• Hot and warm water distribution in residential buildings
• Light-commercial hydronic piping where PE-RT systems are specified
• Tight routing situations requiring a compact 45° directional change

Key specifications

• Material: PE-RT (polyethylene for raised temperature)
• Nominal diameter: 20 mm
• Angle: 45° fixed bend
• Connection type: welded (suitable for fusion or compatible press welding methods)
• Application temperature range: suitable for hot and warm water distribution systems (follow system design limits)
• Typical use: heating and plumbing distribution piping

How to use

Prepare the pipe ends according to the chosen welding or press method, ensuring clean, square cuts and removal of any debris or oxidation. Align the 20×45° welded elbow with the pipe ends and perform the fusion or press-welding procedure following the equipment and material manufacturer instructions. Allow required cooling or curing time before applying system pressure or thermal load. Verify joint integrity with appropriate leak testing prior to commissioning.

Usage recommendations

Use compatible PE-RT pipe and fittings and follow recognised fusion or press-welding procedures to ensure durable, leak-free connections. Observe the piping system’s maximum operating temperature and pressure limits, and perform pressure testing after installation. For installations in exposed or mechanically loaded locations, provide appropriate support and protection to avoid deformation or damage to the fitting.