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Anz
24-04-2014, 07:23 PM
Alright lads,

Had a suction valve to swap on a Mitsi vrv 2day it wouldn't heat up for love no money!
The bloody thing ended up shearing off as I'm tryna move it whilst heating it up with the oxy!
I reckon it's due to the wet rags on the brass valve behind it, reckon I'll need to braze it up without the rags?! Good idea?
11438

Anz
24-04-2014, 07:24 PM
Please don't point out I maybe should've cut the copper instead :)
Thanks

Just to clarify I got a 1 3/8" to 7/8" reducer to join them

The Viking
24-04-2014, 07:54 PM
Brazing a valve without properly wet ragging it is never a good idea.

The solution lies in more power.
Bigger nozzle, perhaps a pepper pot type, is the way to go.

:cool:

Neddy
24-04-2014, 10:17 PM
Changed a four way valve on one of those with only front access and it was a nightmare as that big brass manifold takes all the heat.I would wet rag everything. Two torches might be an idea. Get a pepper pot nossle or a big nossle like a 16. Even with rags the brass will absorbe a lot of heat. Was the old one leaking? Get the side cover off the unit to get better access for brazing. Good luck.

nike123
25-04-2014, 05:21 AM
http://www.amazon.com/Heat-Absorbing-Material-Gel-Quart/dp/B007PB4ZSU

Anz
25-04-2014, 06:44 AM
Im gunna get the panel off 1st thing, I'm using a 16 tip, got a roxy kit too, I knew this was gunna be a swine!

The MG Pony
26-06-2014, 02:12 PM
My secret wepon is the smith quick braze torche with a big C style multijet tip, it is like a jewlers torch, great for such instences, and best off all got it from fley bay cheap, failing some investment in a simple torche as others said need to flash the heat into the joint faster befor it propigates to the valve, and all ways keep the valve quenched.

http://www.ebay.com/itm/SMITH-QUICKBRAZE-OUTFIT-LITTLE-TORCH-23-5005A-/331231553079?pt=LH_DefaultDomain_0&hash=item4d1ef06637 here is a link to the first one I found if interested, I do highely recomend them, the hoses are crap but easy to replace, and it does make life real easy on such instences.

Anz
26-06-2014, 06:00 PM
I sorted it a while ago now, did it by using the van jack to get at it underneath n cutting a big hole in the case ;)

install monkey
26-06-2014, 10:03 PM
oxy acetylene is best as its a confined heat- maybe use a turbo torch heat sheild to concentrate the heat - or as you say hacksaw the valve out and move the valve and possibly the flange forward- saves trying to unsweat it