Grant 26e Vortex prv

[MickyP10]

What are these like to change, please? Looking down on it, unscrewing it looks like it'll catch on the aav (which was silly-tight when replaced by an engineer). Also, if depressurised, will removal still create a 'gusher'? (This is a bungalow, so no additional 'weight on water.)

The history to this is I ran the thermostat a bit hotter when it went to minus 15 a couple of days ago and, although the pressure didn't seem to exceed 2-bar, there was a pressure loss. Investigation revealed water escaping via the external outlet. Grant tell me the 2.5 bar prvs have been replaced by 3-bar ones now.

Thank you!

 

[Exedon]

First when system depressurised check pressure in expansion vessel is correct,.
If you shut of the valve with blue handle and pump valves on heating pump you have isolated boiler from system.
Very little water will escape, 3 bar is now correct for new prv .
Be very careful not to catch pressure switch they snap off for fun. The pressure switch has not been fitted for some time on new boilers so we remove them then plug socket (1/4 bsp) and put a link on board when pressure switch wireing removed

 

[MickyP10]

Re the expansion vessel, I have two, the boiler one and an external. So I'll check both. I've been quoted .8 bar for the vessel and 1 bar for the boiler. Does that sound correct? Also, do you think the blue handled valve will start leaking when disturbed?

Many thanks and apols for all questions!

 

[MickyP10]

Update. PRV shot and both expansion vessels had zero pressure. Working great guns now!