Carver cascade boiler….pressure relief valve broken off

outdoorellen

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Hi all,

Pressure relief valve kept releasing…lime scale and old. Put on new seals etc and blocked inflow valve to reduce weight….went to change pressure relief valve and it crumbled away leaving the screw in part well screwed in and solid with lime scale?
Apart from replacing the whole thing , which I don’t mind doing really, anyone have any ideas?

Thanks, Ellen
 
Thanks for your thoughts…..reckon it’s probably all furred up , so replacing it is likely to be the best option …or maybe a refurb… Cheers
 
outdoorellen said:
Hi all,

Pressure relief valve kept releasing…lime scale and old. Put on new seals etc and blocked inflow valve to reduce weight….went to change pressure relief valve and it crumbled away leaving the screw in part well screwed in and solid with lime scale?
Apart from replacing the whole thing , which I don’t mind doing really, anyone have any ideas?

Thanks, Ellen
Click to expand...
You should be able to remove the broken off part with a stud extractor. Clear all the crud off the inside first and get back to clean metal (brass no doubt). I guess it'll either be around 1/2" or 3/4" hole depending on whether it's 1/2" or 3/4" BSP thread, you can get a set for less than a tenner
www.ebay.co.uk

Internal Screw-in-type Stud/Bolt Extractor Removing Set 8 Extractors rang 3-26mm | eBay

Find many great new & used options and get the best deals for Internal Screw-in-type Stud/Bolt Extractor Removing Set 8 Extractors rang 3-26mm at the best online prices at eBay! Free delivery for many products.
www.ebay.co.uk
Good luck 🤞
 
May as well fix the old if y'can. Can be done easily by taking the unit out. I've done it twice, once with it in situ (never again, ever!), then again with it out (not so bad). Chipping the old and brittle plastic out is the time consuming bit. Don't use an extractor as it'll potentially bust the case.
When it's all out use a bolt with the correct thread (it's still in my toolbox for a repeat performance) working it in and out 'carefully' to clean the thread inside, and hey presto. Carefully screw in the new one with a bit of lubrication and don't overtighten.
 
NickEff said:
May as well fix the old if y'can. Can be done easily by taking the unit out. I've done it twice, once with it in situ (never again, ever!), then again with it out (not so bad). Chipping the old and brittle plastic out is the time consuming bit. Don't use an extractor as it'll potentially bust the case.
When it's all out use a bolt with the correct thread (it's still in my toolbox for a repeat performance) working it in and out 'carefully' to clean the thread inside, and hey presto. Carefully screw in the new one with a bit of lubrication and don't overtighten.
Click to expand...
It's not brass then but plastic I take it? In that case the stud extractor could pose a problem as you say.
 
This is how 12mm drill bit, drill plastic out take your time then pick out the thread use very small screw driver bend the end so you can get some more out then use the bolt working in and out slowly. Bolts a bit of lash up but it works done this sort of thing many time over my life time
 

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Greengrass said:
This is how 12mm drill bit, drill plastic out take your time then pick out the thread use very small screw driver bend the end so you can get some more out then use the bolt working in and out slowly. Bolts a bit of lash up but it works done this sort of thing many time over my life time
Click to expand...
Pretty much what I said then.

I've used a 1mm cutting disc to make a tap out of an old bolt many times, one cut is enough, very useful to put a thread into wood or plastic too.
 
Pudsey Bear said:
Pretty much what I said then.

I've used a 1mm cutting disc to make a tap out of an old bolt many times, one cut is enough, very useful to put a thread into wood or plastic too.
Click to expand...
Brill, 66 years on the planet and never seen that done before! Never to old to stop learning eh (y)
 
I bet you have too, we all have I suppose not always able to put them into practice though.
 
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