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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...

The ICG PRV is set to 3.0bar, what is the other PRV set to??

That's a good idea, you might then take a few readings with various HW only draw off flowrates and ditto from the balanced cold. Why is there another PRV installed?, is it because the mains pressure exceeds the max (I think) pressure ratio of 3:1, ie, a max mains pressure of say 8 to 9 bar...

It is, but when you shut a tap taken off the balanced cold and when/if the pressure builds up very rapidly due to the water flow stopping abruptly then the PRV will close very rapidly, the pressure is then trapped in the mains up as far as the PRV but any pressure that may have built up in the...

Have you got two PRVs installed?, one on the mains + the ICG PRV?.

I would suggest installing it before the PRV because the PRV closes when the upstream pressure is > 3.0bar so the arrestor wouldn't be of any benefit if installed on the balanced cold, (if the hammer is in the mains leg), the UVC EV should act as a arrestor to relieve the pressure in the...

Can only try and explain this a bit theoretically because I don't really understand water hammer where seemingly the kinetic energy is converted to pressure energy and even though water is incompressible would expect a very slight increase in "pipe" vol. A 0.16L arrestor precharged to 3.0bar...

OK, so its associated with the balanced cold only, (the kitchen tap is taken off the mains as you said) There is a check valve (NRV) in the ICG as shown below, this means that the EV if teed off the ICG port is only seeing the UVC pressure and will rise when the cylinder has been heated, EVs...

There is nothing between that T (for the EV) and the cold water inlet to the UVC??. If you open the outside tap which is fed directly from the mains instead of one of the balanced ones but in the same sequence that produces hammer does it have any effect?