Knee press 45°, 26 x 26

Product detailed description

This 45° press elbow is used in residential and commercial heating and plumbing systems where directional changes are required. It is commonly installed in underfloor heating circuits, domestic hot water lines, and central heating distribution systems. The fitting allows for a gradual change in pipe direction, reducing turbulence and pressure loss compared to 90° elbows. It is suitable for systems operating at moderate temperatures and pressures, and is often used in conjunction with other press-fit fittings and valves.

Installers working with ALPEX press systems will find this elbow ideal for creating angled connections without the need for soldering or threading. The press connection method ensures a leak-tight joint when used with the correct tools and accessories. The elbow is typically installed in dry or semi-dry environments, such as mechanical rooms, basements, and utility areas.

Technical parameters

Material	Nickel-plated brass CW617N
Operating temperature	+120 °C
Nominal pressure	PN 10
Weight	0.204 kg
Code	510099
Brand	IVAR

The nominal pressure rating of PN 10 indicates that the fitting is suitable for systems operating at up to 10 bar. The maximum operating temperature of +120°C makes it suitable for hot water and heating applications. The material combination of nickel-plated brass and EPDM ensures compatibility with water and glycol-based media. These parameters are essential for correct sizing and system design, particularly in systems with high thermal expansion or fluctuating pressure conditions.

Installation and connection

To install the 45° press elbow, the ALPEX pipe ends must be cut cleanly and deburred. The elbow is then slid over the pipe, ensuring that the EPDM sealing ring is seated correctly. A stainless steel sleeve is inserted over the joint and pressed into place using a calibrated press tool. The press tool must be set to the correct depth to ensure a full and even press. Common installation errors include incorrect press depth, misalignment of the fitting, and failure to check for burrs or dirt before pressing. After installation, the joint should be inspected for visual signs of damage or misalignment.

Compatibility and accessories

This press elbow is specifically designed for ALPEX pipes with a 26 mm outer diameter. It requires a stainless steel sleeve and a press tool compatible with the IVAR press system. The EPDM sealing ring is standard and does not need to be replaced unless damaged. No additional products are required for installation, provided the correct tools and materials are used. Installers should ensure that all components are from the same manufacturer to maintain system integrity and warranty conditions.

Technical background for designers

The 45° press elbow functions by creating a directional change in the pipe while maintaining a smooth internal flow path. The nickel-plated brass body provides corrosion resistance and mechanical strength, while the EPDM sealing ring ensures a tight seal against water and glycol-based fluids. The stainless steel sleeve reinforces the joint and prevents leakage under pressure. The fitting is designed to integrate into press-fit systems with minimal disruption to the flow. The service life is influenced by the quality of the press connection, the operating temperature, and the chemical composition of the fluid in the system.

Service and operation

This press elbow requires no regular maintenance under normal operating conditions. However, it should be visually inspected during routine system checks for signs of corrosion, leakage, or mechanical damage. If the system is shut down for an extended period, it should be drained to prevent freezing or degradation of the sealing material. No service intervals are specified in the product data, as the press joint is designed to be permanent and maintenance-free.

Frequently asked questions

Can the 45° press elbow be used with other types of pipe besides ALPEX?
No, this fitting is specifically designed for ALPEX pipes with a 26 mm outer diameter. It is not compatible with other pipe types or press systems.

Is it possible to reuse the press elbow after it has been pressed into place?
No, once the fitting has been pressed, it cannot be removed or reused. A new elbow must be installed if the connection needs to be replaced or modified.

What is the maximum allowable pressure for this fitting?
The nominal pressure rating is PN 10, meaning it can operate safely at up to 10 bar under normal conditions. Exceeding this pressure may compromise the integrity of the joint.

Can the EPDM sealing ring be replaced separately?
Yes, the EPDM sealing ring is a standard component and can be replaced if damaged. However, it is recommended to replace the entire fitting if there is any doubt about the condition of the joint.