CH - where else do I need valves

[olo]

Hi folks,

Please could you advise where (if at all) to use full-bore lever valves on my combi CH pipework. I have valves on flow and return (supplied with boiler) then it's a 22mm main tree with 15mm branches to 6 radiators (which all have TRVs + lockshields). Everything in one zone.

I would probably use one for draining point but I am thinking - is there any other place you would want to have valve ? Becasue it's a closed system, can I create something to easier add cleaner/inhibitor

- what would that be ?

you help is appreciated ...

[John Rumm]

A fixed drain point can work well, especially if you can pipe the output through the wall into a nearby gully. So much more civilised than titing about with bits of hose and drippy hose connections.

You could arrange some combination of valves and a section of stand pipe to allow you to isolate a bit of the system, drain it, replace with inhibitor, and then valve it back into the system.

[Andrew Gabriel]

My system splits into two branches early on (they are actaully separate zones, but that's irrelevant here). I have isolation valves for each branch to enable me to isolate one if it developed a fault and keep the other working. Also, if you have a leak, you could isolate first one and then the other, in order to narrow down the area of the leak.