Having just fitted a brand new PRV on my Baxi Maxflow Combi WM, which is connected to a sealed system, I flushed it through, pressurised the system and turned the heating on. The new valve seemed to be leaking more water past the pressure washer than the old one, until the boiler had been through a couple of cycles of heating up and cooling down. Now all seems to be well. Is it normal to need a couple of cycles of heating and cooling for the PRV washer to 'bed in'? Thanks and please pardon my ignorance.
Baxi Maxflow PRV- not a problem, just a query.
- Thread starter apcosantana
- Start date
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how can you tell from there baxpoti
I was thinking that the punter has filled the system and manually opened the PRV and got some muck init
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I think he just overpressurised it it expanded, ejected and now its at a lower pressure
Hi! The punter here. I manualy opened the PRV a little, as I started to re-pressurise, thinking this would expel any air trapped behind the valve. I also ran some more water off through it by manually opening it when it was dripping, in case I'd overpressurised. After that there is no drip. I'd only pressurised to the 'normal when cold' line.
Many thanks, corgiman. At least they're not expensive, if I have to fit another one!
You were also right; the pressure was almost nil in the expansion tank, which probably caused the pressure to rise to the level that caused the old PRV to open and start leaking in the first place. I repressurised the air in the expansion vessel, let the new PRV 'snap' shut and now all seems to be well with no leak and no high rise in pressure when the system is hot!
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