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Discuss Expansion Relief Valve in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Hi,

I am relatively new to installing and repairing unvented cylinders, having worked largely on vented systems up until now. Today I have come across a megaflow that has a TPRV but no Expansion Relief valve on the inlet. Is there ever a situation where the ERV isn't required or does not have to be fitted? Thanks for your help.

John
 
Are you G3 registered?
 
Hi John.
I assume you are G3 qualified? Can't really give much advice about unvented on forum other than basic.
I would think the pressure relief valve is also required. Somebody has maybe removed it, or very likely never installed it at installation. Ring Megaflow tech to confirm.
If you had a water supply that was say, only 2bar max incoming, there would still be a risk that the mains supply could increase by the water authority later, so still requires that extra safety feature.
 
Cheers.

That's what I thought. The d1 pipe has 2 pipes going to the tun dish but 1 was capped off which is why I wondered if it was ok or not.
J
 
Should have one normally between the pressure reducing and the cylinder inlet
 
If there is one on the MI's then there should be one on your install.
 
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