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Unvented composite valve (reliance) query?

Discuss Unvented composite valve (reliance) query? in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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macka09

Plumbers Arms member
Plumber
Gas Engineer
Messages
1,226
Hi all. I seen an install today of a direct unvented cylinder which looked odd and just wanted some advice on it please. On a composite valve am I right in thinking, there’s a 22mm cold inlet, 2 balanced cold outlets and a prv??
 
expansion vessel port normally after the balanced
 
macka09 said:
I thought that was the case but I’m being assured that the 22mm connection on the side can be used for a balanced cold as well as a balanced cold out the bottom of the valve??
Click to expand...

it could be but no scv in the end so would require one
 
That’s the set up guys!

89283EED-4D92-41DA-95E6-60C6DD040CEB.png
 
macka09 said:
I thought that was the case but I’m being assured that the 22mm connection on the side can be used for a balanced cold as well as a balanced cold out the bottom of the valve??
Click to expand...
Balanced cold only any good before the check valve, if you blow back through the valve (opposite direction of flow) the port your getting air through is for the expansion vessel and the other will be for balanced cold
upload_2018-8-9_22-15-24.png


upload_2018-8-9_22-15-24.jpeg
 
macka09 said:
Single check valve ??
Click to expand...

Yea else hot water could flow backwards

Pressure reducing valve
Balanced take off with internal check valve
Balanced take off
Single check valve
Pressure relief valve

Would have to go like that so separate prv and relief valve needed
 

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