Straight radiator unions

Direct heating screws are threaded brass fittings designed for integration into central heating systems. These fittings feature flat sealing surfaces and are suitable for high-pressure environments with a maximum operating temperature of +110°C. They are commonly used in radiators, underfloor heating manifolds, and other heating circuits where precise flow control is required. The fittings are manufactured from CW617N brass, a lead-free alloy known for its durability and resistance to corrosion.

These fittings are certified for potable water applications and are available in a range of standard pipe thread sizes including 3/8", 1/2", 3/4", 1", 5/4", 2", and 6/4". They are ideal for use with flat gasket sealing systems and are compatible with most modern heating system designs.

How to choose

• Select the correct nominal size (e.g., 1", 3/4") based on the pipe dimensions and flow requirements of the system.
• Ensure compatibility with flat sealing systems (SP type) and check for proper alignment during installation.
• Verify the operating pressure (PN 25) and temperature (+110°C) to ensure suitability for the intended application.
• Confirm material compliance for potable water if the system is part of a domestic hot water loop.

Frequently asked questions

What sealing method is used with these fittings?
Flat sealing (SP) is used, which requires a flat gasket between mating surfaces to ensure a tight seal.

Are these fittings suitable for potable water systems?
Yes, they are certified for potable water use and meet relevant standards for drinking water applications.