Drainage Issue, Possible Durgo Valve Fault?

[cr0ft]

Hi all,

Going to a drainage job this PM. The customer has an upstairs bathroom and downstairs cloakroom all draining into a stack at the front of the house with a Durgo valve in the loft. Recently they say the upstairs toilet, basin, bath and downstairs basin are all backing up. The downstairs toilet flushes fine. The basin downstairs connects into the stack just above the downstairs toilet.

The thing is, they all back up but then they eventually clear. I know this could mean a 90% blockage in the vertical section of pipe between the downstairs WC and the basin connection but could a faulty Durgo valve cause this? If so will removing the valve temporarily prove this is faulty?

 

[GQuigley67]

you can get someone to flush for you while you look at the valve, if it doesnt operate then you know its at fault if it does then you know it isnt...if your on your own then removing it will confirm it for you.