Empty conduits on the property - ideas? - It's not too late yet :)

Don't have/want to bury a 32mm pipe? The valves should then also be 32mm. Otherwise, you'll create a bottleneck and the flow rate will suffer significantly.

Don't you have/want to bury a 32mm pipe? Then the valves should also be 32. Otherwise, you create a bottleneck and the flow rate suffers massively.

You're right, supply line 32mm, branch 25mm.

So, let's get started:
1 x valve box with protective cover "square"
6 x Hunter magnetic valve PGV-101G-B
7 x connector fittings for DA-25 pipe
6 x double nipples both sides 1 inch
3 x cross water distributor 1 inch
1 x end cap for the water distributor

What I'm unsure about now is the air pressure connection – what does something like that look like and where is it installed?

/EDIT
Ok, I just see that the DVS sets have either 25mm or 32mm (inlet and outlet), no mixed installation, another argument for DIY.

Also installed on the distributor at the valves. Looks more or less like a water connection. A valve in front of it.

So you only do your loops with DN25? That will be tight with the flow, right? Have you designed it to fit?

It is also installed on the distributor at the valves. More or less looks like a water connection. A tap in front of it.

So you only make your circuits with DN25? That gets tight with the flow, doesn’t it? Did you design it so that it fits?

I have laid 25mm PE pipes, yes. I would use 32mm (about 5m) as the supply line to the valve box. I'm still undecided whether to make 2x3 valve boxes and make a T-piece from the main line or put everything into one box.

You had recommended laying 25s everywhere. Great, just realized that DVS sent me the wrong swing joints.. 3/4” on both sides...

Right. Therefore, I am surprised that you still use the 32s for 5 meters. That doesn’t make a difference. The 25 valves fit accordingly. I think I confused it with who installs dn32 everywhere.