What's this valve's purpose

[Allgoode]

Hi guys,

Prob a very quick one for you seasoned people.

Working in a customers house with old central o/v heating system.

He could not get flow to the upstairs rads or extension rad which was on a drop at the end of the house.

Pump was an old Grundfos selectric which was weak so replaced with a new Grundfos UPS3 15-65 pump which after changing it & valves and cleaning out the F&E tank sorted out issue.

He's had a new bathroom fitted with a new victorian style rad & extended the system upstairs into one of the bedrooms with a K2 rad.

Since then the system struggles to get heat past the first x2 rads upstairs.

I have looked under the floor boards & the pipework seems ok without any nasty iso valves favoured by some tradesmen, all copper end feed jointing.

Whilst scratching my head i explored the rest of the system and found this on the upstairs rtn pipe to the pump.

I'm thinking its a non return valve or similar poss crudded up with the system disturbance & will be removing it on the next visit.

Looking for some confirmation of what it is,

Cheers Guys,

Thanks,

Andy

 

[ShaunCorbs]

Nrv/anti gravity valve

 

[Allgoode]

Nrv/anti gravity valve

Cheers Shaun,
Replace or rip out as pumped central heating with separate gravity 28mm on hot water cylinder.
Old floor mount boiler.

 

[Last Plumber]

Cheers Shaun,
Replace or rip out as pumped central heating with separate gravity 28mm on hot water cylinder.
Old floor mount boiler.

If there's an issue with it i.e. it is damaged or broken, then replace it. It is most likely there to prevent the rads warming when DHW only is on.