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Discuss Non return valve on unvented in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

gingalig

Gas Engineer
Hi, thanks in advance for any advice, I've come to change a manifold for the ufh, I have noticed a non return valve on the main dhw outlet on the unvented cylinder
Is this acceptable ?
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Hi, thanks in advance for any advice, I've come to change a manifold for the ufh, I have noticed a non return valve on the main dhw outlet on the unvented cylinder
Is this acceptable ?
My thoughts are no it's not.
 

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Stigster

Esteemed
Plumber
There's no safety reason why it shouldn't be there and is no different to having non-return valves anywhere else on the hot distribution side of the system. Do you have a secondary return (pumped circuit) on your system?
 
OP
gingalig

gingalig

Gas Engineer
There's no safety reason why it shouldn't be there and is no different to having non-return valves anywhere else on the hot distribution side of the system. Do you have a secondary return (pumped circuit) on your system?
No there isn't. Thanks for the reply.
 

Stigster

Esteemed
Plumber
Unless you can find a decent explanation for why it's there I don't think it's necessary but at the same time it's not really doing any harm either.

It would be interesting to know the reasoning behind it being fitted there though.
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Backflowing though a shower mixer or tap prob
 

snowhead

Esteemed
Plumber
So they went for a "whole system" approach rather than at point of use I suppose. The shower feeds may have been inaccessible which would make sense of that valve's position.
And at least it's easilly found and accessible if it fails.
 

AWheating

Plumber
Gas Engineer
Probably a tmv/ mixing valve causing an issue. Is your cold water alot better than your hot? Pressure wise?

Many tmv's have problems if theres a different between the hot and cold.
 

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