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  1. #1
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    My first big tev kicked my butt.

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    First I found that the brazing tip on my torch kit was too small to unbraze the old txv. I drive 45 minutes for a rosebud tip. Then after many failed attempts to braze the new valve I ran out of n2 and acetylene. Used 3 full bottles of each, the big rosebud used a mc bottle in about 5 minutes. After waiting 90 minutes for the on call guy to help with more gas and more experience, we called it a day at 10:30 pm and it still leaks. I thought it was going to be just another easy txv day. Got home after the 2 hour drive about 12:30 and back this morning at 6 on a different job, I wanted to fix it myself.

  2. #2
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    Thread Starter
    3rd pic upside down, oops.

  3. #3
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    Valves that large I completely disassemble then braze.

    Wet rags and thermos block doesn't cut it.

  4. #4
    Join Date
    Mar 2008
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    Quote Originally Posted by pecmsg View Post
    Valves that large I completely disassemble then braze.

    Wet rags and thermos block doesn't cut it.
    or just rebuild the valve
    Honeywell you can buy better but you cant pay more

    I told my wife when i die to sell my fishing stuff for what its worth not what i told her i paid for it

  5. #5
    Join Date
    Nov 2006
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    Athens, Ohio
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    Yeah, there's a lot of mass to heat up to braze those. They are a challenge.
    Good for you on staying with it to finish it.
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  7. #6
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    Aug 2002
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    Quote Originally Posted by crazzycajun View Post
    or just rebuild the valve


    Had to do that on a Carrier Chiller. Much easier then all the Burn Permit BS!

  8. #7
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    Nov 2011
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    You likely have your gas pressures turned up too high. A rosebud tip doesnt require any more gas than a standard tip. Set your pressures at 7/7 and adjust from there, if necessary. I braze 130 ton TXVs at those pressures.

    Use heat paste around the body and wrap in wet rags. Braze one side, pour water on to cool, then braze the other.

    Make sure to clean everything as well as possible, and use flux on the fittings you unbrazed. Sometimes I will cut the old inlet side piping braze joint off, so I have fresh copper.

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  10. #8
    Join Date
    Oct 2005
    Location
    B.C. Canada
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    My first big tev kicked my butt.

    The best is when the distributor tubes start popping out! Gah!!


    Sent from my iPhone using Tapatalk

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  12. #9
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    Thanks for the advice, the next one will be better.

  13. #10
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    Quote Originally Posted by coolerik View Post
    The best is when the distributor tubes start popping out! Gah!!


    Sent from my iPhone using Tapatalk
    I fill them with heat paste and rags!

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  15. #11
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    Quote Originally Posted by ksefan View Post
    Thanks for the advice, the next one will be better.
    Get some scrap and practice with the rosebud. Once you get used to it, youll prolly only use that.

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  17. #12
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    Nov 2006
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    I wrap the distributor tube assembly with a rag just to keep those from popping out.

    Sometimes...before I go to install the valve....I will braze on a copper stub with the stub facing up and the tip pointed away from the valve, and then use a coupler with the valve all wrapped up to be able to braze the other end of the stub to the assembly....that way I don't have that much mass drawing away heat from the final connection.
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  19. #13
    Join Date
    Aug 2016
    Location
    Houston TX
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    Replacing the TXV on a brand new unit? Wonderful carrier quality control. They likely over heated it in the factory. Good job staying on it though.

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