What Is This?

[yehaah]

Hi,

Can anyone tell me what this is?
View media item 41124It's in the Central Heating return pipe. My guess, it's a pressure relief valve. I keep losing pressure and the drip is a clue to the culprit but I can't find anything like it on-line.

Ta

 

[Onetap]

Hi,

Can anyone tell me what this is?

Pressure relief valve, spring loaded. It unscrews from the tee. Fit a modern PRV.

If it's an open vented system, ISTR there's no legal need for it, but I'd fit a PRV to sfeguard against the OV and cold feed freezing.

 

[stardanny]

It's a safety valve.

Bes will have one in stock. Spring Safety Valve.

http://www.bes.co.uk/products/098.asp

Dan.

 

[yehaah]

Thanks for the quick replies.
Having looked on the BES website, it says the pressure is adjusted by turning the external nut. So how do I know what pressure it's set to?
The system is a sealed system hooked to a Worcester Combi (24CDi) which has a PRV built in. Does that suggest I don't need this Spring Safety Valve?

Mark

 

[coytech]

hi
yes its an old style safety valve which would have been fitted to your old system,you need to plug it off now (1/2"bsp plug) as its not needed any more its not made to take the pressure of your new sealed system thats why its started leaking.

 

[yehaah]

Thanks all,
Fingers crossed the PRV in the boiler is ready to start doing it's job once I cap off this old spring valve