Discuss Temperature relief unvented cylinder in the USA Plumbers Advice area at PlumbersForums.net
Thank you I have just taken them apart it's the 6bar expansion relief valve on the incoming main that's letting by have recharged expansion vessel and is still letting by. Its a direct cylinder.You sure you mean the combined temperature and pressure relief valve? The 7 bar 95°c one?
Is it fed by immersion or boiler?
It's most likely a bit of crap stopping the valve from seating properly. Of course it could be sensing excess temperature and that needs investigatin
Its probably not pressure related because the 6 bar expansion relief valve on incoming main should activate first, unless that's faulty. If that's the case you'd need to investigate why the incoming pressure has risen ie, faulty pressure reducing valve etc.
Thanks the expansion vessel was totally empty when I got here. I have recharged and is still dripping. Do they sometimes not reseal correctly when discharged?Crap can and has caused this but usually flushing through would dislodge debris. Any doubts just isolate supply and take off and have a look. I suspect though that if the vessel is sound and of right size and reducing valve is ok then your problem lies elsewhere
I did yes. I dropped pressure and took expansion vessel off as couldn't reach it in place.Are you a 100% sure the vessel hasn't failed? Have you tried dropping the pressure slightly through nipple to see if water appears or air? The vessel as you know is just a rubber diaphragm filled with air and no water should escape from nipple unless the diaphragm had ruptured. Also when you recharged the vessel did you drop the pressure out of the system first?
Its high around 8 bar.What’s the main incoming pressure could be back pressuring
What’s the main incoming pressure could be back pressuring
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