Plan for Revised Heating Plumbing - Appreciate any feedback

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Evening

I am looking for your opinions on a plan I have in mind to have my boiler replumbed at the same time as having a smart control system installed, where all the radiators can be controlled individually using smart TRVs, removing the need for a conventional S or Y plan system, via 2x2 port valves. The domestic hot water will also be controlled by the same system.

Please see the attached diagram.

The boiler is a Vokera condensing wall mounted gas fired boiler. I understand that the Vokera isolation valves, that came with the boiler are notorious for leaking once they are used so my first thought was to have a full bore butterfly isolation valve installed in both the flow and return lines alleviating the need to ever have to use these.

My thoughts are that when the time comes to replace the boiler it can be done without draining the system plus if the boiler needs to be isolated to check for a potential leak within the boiler then these new isolating valves could be used for this purpose.

I appreciate that the drain valves shown on the flow and return lines are before these new isolation valves so they would be see pressure if a leak was suspected inside the boiler was being tested for, however the drain valves would be visible and easy to confirm that they were holding pressure during such a test.

The isolation valves can also be used to isolate the boiler from the system and then using drain valves the boiler can be drained to check the pressure on the primary expansion vessel at the rear of the boiler.

Once the system was operational I plan to remove the heads from all the isolation valves so that they could not be operated ( closed ) by mistake.

The filling loop would be t’d into the return line after the isolation valve in the return line.

I have noted that the system pressure, when up to the maximum temperature, rises to 2 bar so I plan to have an additional expansion vessel installed, in the return line again after the isolation valve. I also plan to have an isolation valve installed in the pipe work to the additional expansion vessel, together with a drain valve, so that the additional expansion vessel can be checked without having to take the pressure off the system. This additional expansion vessel will be situated below the boiler and therefore below the drain valves in the flow and return lines.

A magnetic filter is to be installed in the return line again after the isolation valve. I appreciate that the magnetic filters have isolation valves.

The automatic by pass will be installed between the flow and return lines.

The 3 Bar PRV from the boiler is plumbed to the outside.

The lines in pink with isolation valve are for a future radiator with a smart TRV.

I was wondering what your thoughts about this were ? Are there any glaring mistakes / issues with this plan ?

Look forward to your feedback.
 

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I've never heard of butterfly valves being used on a heating system, and AFAIK the smallest ones available are 25mm
 
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OK, but are they used on heating systems? Just curious. I'd have thought they would give high headloss, and more risk of blockage than other types of valve.

Where's the loss? They're full bore and no different to levers, other than they look better and need less room to operate.
 
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OK if that's standard terminology in the industry, I stand corrected. I used to work in much bigger stuff, eg water and sewage plants, where butterfly valves have a disc like a carburettor throttle

Yeah. I'm familiar with those too.
But in the context of this diy forum, I wouldn't have considered the OP to have meant the big boy stuff :D
 

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