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  1. #1
    Join Date
    Apr 2008
    Posts
    159

    Question about replacing a soft soldered TXV

    But for an occasional drain line I've almost never done anything but brazing so I'm looking for advice on unsoldering and replacing a 15 ton Sporlan valve may have to change out.
    About an inch and a half past the soft soldered outlet where I'd be making the repair and right at or into the case wall is the distributer head which is also soft soldered -that I do not want to get in to.
    I'm concerned about possible problems getting a good connection over the old solder (let alone protecting the second joint). And also advice about flux, and keeping that out of the system?

    ..Seems like this may be a heck of a place to try to ramp up low temp torch skills

  2. #2
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Get it as clean as you can, flux it, solder it with Stay Bright 8 and a MAP gas torch, and protect the other joints with a wet rag.

    Maybe toss in some prayers.
    If more government is the answer, then it's a really stupid question.

  3. #3
    Join Date
    Aug 2012
    Location
    willowick ,oh
    Posts
    261
    Are you sure its soft soldered. Just because it looks like soft solder doesnt mean it is. It may be silver solder.

  4. #4
    Join Date
    Jun 2012
    Posts
    527
    Maybe a little heat sink paste where you don't want heat if you have room.

  5. #5
    Join Date
    Jan 2008
    Location
    Texas
    Posts
    1,790
    Quote Originally Posted by mark beiser View Post
    Get it as clean as you can, flux it, solder it with Stay Bright 8 nd a MAP gas torch, and protect the other joints with a wet rag.

    Maybe toss in some prayers.
    All I use is staybrite#8 on txv. I slip the pipe in slightly then flux. This helps keep the flux out of the system. Solder doesn't like to flow where there is no flux. Needs to be very clean.

  6. #6
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Wet rag on dist and get r done. Map torch and put the heat where u want it. Don't over think it. If u got a rose bud tip on your AA torch might use it to get the old unsoldered, speed up the process so heat doesn't have time to run down the line. Hit it fast and have another wet rag ready to through on the line.

  7. #7
    Join Date
    Apr 2008
    Posts
    159
    Thank you for the responses. Yeah I thought there were issues with re-soldering not taking well.
    Regarding MAP I assume this is for keeping the temp down while allowing a larger flame (vs a smaller ox/acet flame?

  8. #8
    Join Date
    Apr 2008
    Posts
    159
    Thank you for the responses. Yeah I thought there were issues with re-soldering not taking well.
    Regarding MAP I assume this is for keeping the temp down while allowing a larger flame (vs a smaller ox/acet flame?

    Also, the stuff on there is not like the silver wire- knife-scrape' soft.

  9. #9
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    It's probably 8% silver which is what I would go back with.

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