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

gingalig

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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 ?
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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

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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?
 
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gingalig

gingalig

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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

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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

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Backflowing though a shower mixer or tap prob
 

Stigster

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Backflowing though a shower mixer or tap prob
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.
 

snowhead

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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.
 
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