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Can you show exactly where the expansion vessel (Lower right??) is piped from, also the writing on the labels on all the devices on the cylinder eg. pressure reducing valve, expansion relief valve, and the temperature and relief valve (T&PRV) on the cylinder itself. Also, the vol (capacity of...

Have you tried any mods over the weekend to address the problem??

Just to recap. Original install: Only one (ICG) PRV, cold taken off the balanced ICG port, but EV take off from a T downstream of the ICG and not from the port on the ICG. Don't know if the system worked OK for 6 months or so? before water hammer, but a PRV was/is installed upstream of the ICG...

The "ideal" way I'd like to see that test done is to remove that PRV which is in line with and supplying the ICV PRV and reinstall it in a T off the mains and then take the cold feed from this.

When you say bypass the valve to the balanced feed are you suggesting blanking off the cold (balanced) feed port on the ICV and supplying the cold feed from the mains after the PRV that @Taconite5 has installed?.

You said in your very first post in your Water Hammer thread that "I've noticed since the install was about 6 months old I'm getting a water hammer/knocking/clunking noise from my unvented cylinder whenever the cold taps in my house are open and closed." Was the system trouble free for those...

Well, if you're pretty sure that the mains pressure is 4.5bar then those pressure spikes are normal enought IMO, I'd still like to see the ICG NRV operating "normally", not with a zero dP, but looks like you would have to remove the upstream PRV to achieve this. I can't find a exploded view of...

Are you still getting 8bar near the washing machine T off?, if so, maybe another arrestor here.

You were seeing 8 bar on a (the) PG installed near the washing machine, do you expect 8bar there or can you put another PG on there again and note both pressures. Or you could remove the arrestor at the IGV and connect the PG directly here to see if you still get only 3.0/3.4bar or whatever.

You say in post #12 that ...... "I added a pressure reducing valve set at 3bar were the blue star is. And a hammer arrestor on a T before the ICG. Region around the ICG is where the banging is coming from"...

I think I may have asked this previously. What is the EV capacity??

What's your next move @Taconite5 ??.

This water hammer/pressure spikes is a bit of a mystery to me. I have a washing machine with a 10M, 15mm (12.5mm ID) pipe run from the mains which has a DCV (double check valve) where I installed a PG today very near the DCV to take a few readings. The filling rate is a measured 8LPM and when...

The EV will only act as a shock arrestor for the balanced cold if the PRV remains opened during the "shocking" events which it may or may not, that's why I suggest putting the arrestor before the PRV. The only reason for a Expansion Vessel, a EV, is exactly that, it will accomodate the...

Well, I suppose time to put your plumbing skills to use again. You could, as suggested above, supply the "balanced" cold from the mains PRV but may be advisable to remove this and then T it off the mains to supply the cold only, this PRV will then just supply the cold and the ICG PRV will...

If the cylinder has been reheated overnight I would suggest opening a HW tap for 20/30 seconds to ensure the UVC pressure is fully equalised before opening any balanced cold tap(s), also maybe just slacken off the PG to give a slight dribble so it will give a true reading to counteract the (if)...

Strange all right, cold test, everything downstream of the (ICG) PRV will be at 3.0bar, when you open a "hot" tap everything downstream of the PRV will still be at the same but lower pressure depending on the flowrate, say, maybe 2.8 bar but when you shut the hot tap the pressure will return to...

Just to be absolutely clear, did you (not) carry out that test in the same sequence but without waiting for the cylinder to reheat. Also post the EV capacity.

I'd prefer to just have the one ICG PRV with a mains pressure of 4.5bar, the PRV is then fully in control to maintain that 3.0bar, it probably has nothing to do with your problem but I just don't think its a good idea to have two PRVs in series at such a low dP of, 4.5-3.0, 1.5bar. You drained...

In post #31, thread "Water Hammer" you have a schematic showing a pressure gauge, you say the mains pressure is normally 4.5bar?, did you take this pressure statically, with no flow and before you installed the PRV?, can you post this schematic here showing the position of the PRV and (even...