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Old 01-10-2008, 11:42 AM   #1
mrbowenz
 
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I recently bought 8 stainless steel ball valves( great price ) but the are not threaded, these are 3/4" ... they look to be sweat type as in copper, but being stainless, I would guess they need to be welded ? is there any thing I can do with these? or should I just sell them ?

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Old 01-10-2008, 01:23 PM   #2
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Unless you've got a TIG machine or a generous friend who does, they're not going to work for you. I doubt it will take solder.


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Old 01-10-2008, 03:11 PM   #4
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You might be able to silver solder (special brazing rod) them together. You'll need more than a propane torch though. Gotta add some O2 to get the flame hot enough to do this. I've successfully silver soldered several SS threaded nipples onto SS boil pots and in the next couple days I'm going to braze a 90 degree elbow compression fitting onto one to rig up a sight tube.

 
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Old 01-10-2008, 03:33 PM   #5
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What about just tapping them out to NPT (pipe thread)

 
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Old 01-10-2008, 03:42 PM   #6
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Quote:
Originally Posted by mrbowenz
I recently bought 8 stainless steel ball valves( great price ) but the are not threaded, these are 3/4" ... they look to be sweat type as in copper, but being stainless, I would guess they need to be welded ? is there any thing I can do with these? or should I just sell them ?

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There has to be someone local that would be willing to weld these for you. You could even check on trade schools or colleges with a welding program.

 
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Old 01-10-2008, 04:43 PM   #7
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The problem here is that you will probably need to buy nipples as well, and may need to get them made for you. Most off the shelf nipples aren't the right gauge to fit welded type fittings properly. At any rate, you might be better off to sell them.
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Old 01-10-2008, 05:12 PM   #8
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The problem with trying to tap them is that the ID is already large enough to slip a pipe in. IOW, it's starting with too large a diameter already.
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Old 01-10-2008, 05:16 PM   #9
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I have a welder ( mig ) , but pipe is the issue, I have only schedule 40 threaded in 1/2 and 3/4", there nice 316 SS, by Apollo, I got 8 for 80 bucks , maybe an adapter from 3/4" welded to 1/2" female like a bushing .....hummm, I should have been more careful with the description when I bought them ( ebay , no returns ) , any other ideas ?

 
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Old 01-10-2008, 06:06 PM   #10
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Quote:
Originally Posted by Bobby_M
The problem with trying to tap them is that the ID is already large enough to slip a pipe in. IOW, it's starting with too large a diameter already.
It would probably tap out to 1", though... Depends on the thickness.



 
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