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Do you mean feedback which is what we've discussed above?
yea I would see what the pressure is in the unvented cylinder
Discuss Temperature relief unvented cylinder in the USA Plumbers Advice area at PlumbersForums.net
Do you mean feedback which is what we've discussed above?
Thanks I think my next step would be to swap the composite valve then.Yes that's what hes suggesting and what I had you test for earlier
Thanks I think my next step would be to swap the composite valve then.
Do you mean feed back through a tap? There's one tap, the kitchen tap that has mains pressure one side and 3.5 bar hot water on the other. It's a dual flow tap though. I think.
It hasn't nothis one got a dcv on the hot side ?
Yes thanks very much for your help.
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It hasn't no
I may put a pressure reducer on the main in coming pipe and set to 3.5bar. So it's balanced everywhere.I would fit one and see
I would fit one and see
I may put a pressure reducer on the main in coming pipe and set to 3.5bar. So it's balanced everywhere.
Shaun I advised to isolate cold main into cylinder, drop some pressure out and then see if the PRV started to drip again after enough time for any back feeding to accumulate and it didn't happen, so installing a double check valve is not needed to test correct?
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I would advise one under the kitchen sink on incoming main so as you say it's all balanced, although this is not the current problem
I've never had any issues with them sealing after opening - it's clean water, in theory no rubbish should get under them and thus seal OK.
I've only ever had three fail (where the Expansion has been OK) has been on temperature. One dripped on temperature rise and the other two would open full bore on a temp above 45oc. The other issue is backflow but that seems to have already been discussed.
Daft question - but are you sure it's the Temp/Pressure Relief valve dripping. Many installers tee that in with the blow off from the combination valve before the tundish - could it be this dripping instead? I find more regularly these fail.
Ah yes, I read the first post and skim read the rest!It's the 6 bar expansion relief valve that's the culprit, not the combined pressure and temperature valve mate
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