I've only done this job once so that hardly makes me an expert nor do I have any idea what is standard practice. On a job like this I read up in the FAQ, do a forum search, look at any available manuals, and then make a suitable sacrifice the the Volvo god. Don't ask!

What I did was to try to memorize the routing of that hose with the valve in it. Then I took out the old hose with the valve. The new hose was in one piece so it had to be cut to insert the new valve. I did the cut and inserted the valve to make the new assembly look like the old as well as I could. Then I put the whole assembly back in place as well as I could remember. There are some plastic clips that hold the hoses in place and these are either a help to locate the hose or a source of confusion if you can'r recall the hose "going there".

Getting the hose onto the nipple on the block took some contortion. The hose clamp (you did remember to put that on?) has to placed just right so you can reach down through the manifold runners to tighten it. After a weeks run-in, I had to retighten all hose clamps.

As mentioned earlier, I also had to carefully cut the hose with my trusty scout knife to get them off off the heater nipples.

I'm glad I did the job and hope I don't have to do it again. Good luck to you.