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Old 07-27-2012, 09:44 AM   #1
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Sweating a wet ball valve


I have ball valve that has water to one side, is it possible to sweat a pipe to the other side or do I need to drain the system? Don't know if this matters but this is on a hot water baseboard heating system.

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Old 07-27-2012, 11:08 AM   #2
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Sweating a wet ball valve


if it is brass then you mine as well drain the water side.HVAC trick if you want to do it without draining take a pipe wrench put it in your freezer .place the wrench on the water side of that valve actually right on the valve where the pipe is soldered in.super clean the inside of the other side of the valve the pipe is going in,and the pipe also flux both up and slide it in.about 4" out from the valve start heating the pipe 1" tip off the pipe and walk the flame towards to fluxed connection your looking to solder.the trick is to build the heat up and let the brass get hot quick as possible in the shortest time.as long as your clean where the copper hits the brass it should solder up quickly..watch the heat adjusting the heat moving the tip on the torch 1"...2"..back to 1" off the pipe...NOTE grab the solder lenght and dip in flux also...before starting...the iced wrench will absorb any heat working thru that valve body and the soldered water side will never melt...after your done grab that water side pipe just after you shut the torch...it might be slightly warm if your in doubt just drain the show and go at it.

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Old 07-27-2012, 11:21 AM   #3
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Sweating a wet ball valve


I thought the water might actually soak too much heat that I would not be able to melt the solder on the "dry" side. Didn't think that the heat might actually compromise the already sweated connection. Guess I should just drain it down to be safe.

Thanks for the tip.
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Old 07-27-2012, 08:28 PM   #4
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Sweating a wet ball valve


the water will be off on the water side right and it will pull heat and the iced wrench will keep the solderd joint intact....thats why i suggested walking the heat down the pipe towards the new solder point..the brass has to heat up to take the solder the copper will be good just keep the flame off the brass don't need to nuke it...or the solder will roll off and ruin your day...if the temp stays consistant the flux,solder and copper/brass will take it.if you drain down just hold the torch under the brass valve where the copper slips in and it wil suck it in ....back off on the torch.it takes 10 seconds to solder and a day of prep..just to repeat be clean and use that flux liberally
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Old 07-27-2012, 08:46 PM   #5
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Sweating a wet ball valve


i have never had a problem soldering on the dry side of a ball or gate valve. the wet or side with water on it will not allow soldier to release unless maybe you are using a b tank and get it cherry red
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Old 07-27-2012, 08:48 PM   #6
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Sweating a wet ball valve


I did this last week. Should be no problem.
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Old 07-27-2012, 08:50 PM   #7
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Sweating a wet ball valve


agree with jay & alan....should have no problem soldering on dry side been doing it for 30 yrs never a problem.....you should be fine..

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