ᐅ Heating connection valve manifold cutting ring

Hello to the experts here, I have a problem with my heating system. I bought a house this year built in 1979 and later found out that it has a single-pipe system on each floor. Now I wanted to install new radiators with valve blocks, but unfortunately, the compression rings are not completely tight at the union nut. I can’t find a solution for 15mm (½ inch) steel pipes with a 1.5mm wall thickness. The picture shows the connection. Occasionally, moisture leaks out at the union nut.

Hello

However, the valve manifold is not designed for a single-pipe system.
I would suggest replacing the valve manifold, as it is damaged, along with the compression fittings.
The pipe wall thickness is not relevant. How did you come up with 1.5 mm (0.06 inches)?

Olli

I measured it with a caliper. I chose this valve manifold because I used it for the attic in this case, where the collector only has one pipe going up and one going down. The other valve manifolds have a control valve in the middle. The problem is how to make it easily leak-proof. No matter where I ask, people say that there are no compression fittings for metal pipes and such.

Hello

Just Google compression fitting 15 mm (0.6 inches)
Almost every plumber has something like that in their van.

Olli

Everything has already been done, but unfortunately, all of them are only suitable for copper, and everyone always says there is nothing proper for metal.

Hello

These statements are incorrect.
For example, Ofix CEP is suitable for copper, stainless steel, and precision steel pipes.

Olli