Heres a Pressure PUZZLE for Ya All

Mr_Ted

G/worm 18si system boiler.

1/ Losing pressure.
2/ Found safety to be blowing.
3/ Checked expansion vessel, drained, recharged(BL**DY awkward coz of the shraeder valve location-Stupid designers), and refilled.
4/ Same problem persists???
5/ Goes through the motions several times more.
6/ Same problem persists:huh::doh::wall::whistle:

Also checked system water which is still clean as a whistle after 7 years, and has inhibitor;)

So what else could it be:huh:

Found it though :cheesy: but what do ya all think it could have been and its summat I aint seen mentioned here b4:whistle:

:beer: on me for correct answers :rotfl:

booty40uk

Filling system letting by?

Mr_Ted

booty40uk wrote: »

Filling system letting by?

:)Nope, no beer;)

Myser

I'm guessing that since the PRV is blowing each time and there is a subsequent loss of pressure, there must be an over-pressure situation to cause this?

jayyar66

My experience of this is that once the PRV operates it VERY rarely seals again properly. This can be from trapped debris on the seat of the valve, but most likely its because the rubber washer sticks to its seat (because its held tightly shut for so long) within the PRV and then tears when it operates and therefore continues to let by. As a result I tend to change the PRV as a matter of course in these situations to save on call-backs.
Am I warm??

Mr_Ted

Myser wrote: »

I'm guessing that since the PRV is blowing each time and there is a subsequent loss of pressure, there must be an over-pressure situation to cause this?

And???.......................

Mr_Ted

jayyar66 wrote: »

My experience of this is that once the PRV operates it VERY rarely seals again properly. This can be from trapped debris on the seat of the valve, but most likely its because the rubber washer sticks to its seat (because its held tightly shut for so long) within the PRV and then tears when it operates and therefore continues to let by. As a result I tend to change the PRV as a matter of course in these situations to save on call-backs.
Am I warm??

:)Nope no beer

Sorted that and PRV ok but still the problem;)

southcoastrgi

What's it connected to ?

keystone

Mains pressure on DHW side of HEX is getting across to CH side.

Cheers

Mr_Ted

southcoastrgi wrote: »

What's it connected to ?

:eek:Rads & unvented cylinder

Mr_Ted

keystone wrote: »

Mains pressure on DHW side of HEX is getting across to CH side.

Cheers

:eek:G/worm 18si system boiler???