Central heating refill valve and pressure relief vent

[AndyIrons]

Hi all, hoping you can advise on a couple of problems I need to resolve. Please see photo

1. Not sure why there are two valves (in series) to operate to feed water into the system and raise pressure, but the lower (first) valve leaks water while open. Initially a small dribble, but most recently a major jet, worried it may totally fail next time it is operated. So I’m looking into changing it. Should I fit a like for like replacement, is it a suitable type of valve?

2. I need to re-route the pressure relief vent pipe as an extension has been built across where it exists the wall. Please confirm I can do this without needing to drain the system. Also please advise what sort of vent should be fitted on the end of the pipe, externally.

Thanks in advance

 

[ShaunCorbs]

Yep they tend to leak after a few years best to replace

And correct aslong as it has a fall on it and doesn’t terminate above a door / window you will be fine

 

[AndyIrons]

Yep they tend to leak after a few years best to replace

And correct aslong as it has a fall on it and doesn’t terminate above a door / window you will be fine

Thanks for replying Shaun,

Do you know if there is a15mm pipe fitting that should go on the external, some sought of insect proof gauze outlet, or will a down-turned elbow suffice?

I have means of isolation both sides of the valve to be replaced. I think it’s compression fittings so is it a reasonable approach to isolate both sides, release the pressure slowly, drain as much as possible and replace the valve? Or am I suggesting something very stoopid!

 

[ShaunCorbs]

Mushroom should do 22mm hole through the wall and sleeved in 22mm if going through brick / block etc

Solder Ring Blow-Off Cowl 15mm (Mushroom)

SOLDER RING BLOW OFF COWL 15MM

www.monsterplumb.co.uk

 

[AndyIrons]

Mushroom should do 22mm hole through the wall and sleeved in 22mm if going through brick / block etc

Solder Ring Blow-Off Cowl 15mm (Mushroom)

SOLDER RING BLOW OFF COWL 15MM

www.monsterplumb.co.uk

Thanks Shaun