Fittings - for solar systems - diameter 18Cu x diameter 18Cu IVAR.SOLAR 2543

Product detailed description

These fittings are commonly used in residential and commercial solar thermal systems, where they provide secure and durable connections between components such as collectors, heat exchangers and storage tanks. Installers working on flat-plate or evacuated tube solar collectors will find these fittings suitable for both direct and indirect circulation systems. The fittings are designed for use in closed-loop systems where thermal expansion and contraction are regular occurrences. The operating temperature range ensures compatibility with glycol-based antifreeze solutions and water-based media, making them suitable for both seasonal and year-round operation in temperate and colder climates.

Installation typically involves connecting copper or steel pipes with 18 mm nominal diameter. The fittings are also compatible with 22 mm pipes, allowing for flexibility in system design and retrofitting. The PN 16 pressure rating ensures they can handle the hydraulic demands of typical solar thermal systems, including those with circulating pumps and heat exchangers. The brass OT 58 material offers good resistance to corrosion and thermal stress, making it suitable for long-term exposure to fluctuating temperatures and varying fluid compositions.

Technical parameters

The nominal pressure of PN 16 indicates that the fittings are suitable for systems operating at up to 16 bar. This is important for sizing the system correctly, especially when selecting pumps and heat exchangers. The operating temperature range from -30 °C to +160 °C allows for use in both cold and hot environments, ensuring the fittings remain functional even in extreme conditions. The 18 mm diameter is a standard size for solar system piping, making it compatible with most collector and tank connections.

Installation and connection

Before installation, ensure the pipe ends are clean and free of burrs. The fittings connect to 18 mm or 22 mm pipes using standard threading or compression methods, depending on the system design. Verify that the thread type matches the pipe and that the sealing material (VITON) is intact. A common mistake is over-tightening the fittings, which can damage the sealing surface or cause leaks. Always check the alignment of the fittings to prevent stress on the joints, which can lead to premature failure. After installation, perform a pressure test to confirm the integrity of the connections.

Compatibility and accessories

These fittings are compatible with standard copper and steel pipes used in solar systems. Additional components such as valves, filters and expansion vessels may be required depending on the system configuration. No specific accessories are listed for this model, but designers should ensure that all connections are properly sealed and supported to prevent vibration and leakage. Related products are not specified for this item.

Technical background for designers

The fittings operate by creating a secure mechanical and hydraulic connection between two pipe ends. The brass OT 58 material provides good thermal conductivity and resistance to corrosion, making it suitable for long-term exposure to thermal cycling. The VITON sealing ensures a tight connection even under high temperatures and pressure. When integrated into a solar system, the fittings must be positioned to allow for thermal expansion and contraction of the piping. The service life and efficiency of the fittings depend on the quality of the installation, the purity of the fluid and the absence of mechanical stress on the joints.

Service and operation

During operation, the fittings require no regular maintenance. However, periodic visual inspections should be carried out to check for signs of leakage, corrosion or mechanical stress. If the system is operating with a glycol-based fluid, ensure that the concentration remains within the recommended range to prevent degradation of the sealing material. No specific service intervals are provided for this model.

Frequently asked questions

Can these fittings be used with 22 mm pipes?
Yes, the fittings are compatible with both 18 mm and 22 mm pipes, providing flexibility for different system configurations.

What is the maximum operating temperature of these fittings?
The fittings can operate up to +160 °C, making them suitable for high-temperature solar systems and heat exchangers.

Are these fittings suitable for glycol-based antifreeze solutions?
Yes, the VITON sealing material is compatible with glycol-based fluids, ensuring a reliable connection in closed-loop solar systems.

Can these fittings be used in direct solar heating systems?
Yes, the fittings are suitable for direct circulation systems where water is used as the heat transfer medium, provided the temperature and pressure remain within the specified limits.