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Replacing TXVs

Discussion in 'Refrigeration' started by Rather B Riding, Oct 4, 2017.

  1. Rather B Riding

    Rather B Riding Behind bars

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    I've never been a fan of replacing TXVs in refrigeration equipment. They're always crammed in so tight you have to figure out how you're going to get it done without burning the shit out of everything. No to mention overheating your new valve. This one was a walk in freezer. End panel was 7" off the wall. Wasn't as bad as some I've done but I still had to get a little creative to get er done. What is your technique for keeping the valve cool during brazing? Cool gel, thermal trap, hot damn, wet rags? If you use wet rags like I me, do you wrap just the head or the complete valve with the IMG_20171004_095441119_HDR.jpg IMG_20171004_094230519_HDR.jpg head?
     
  2. HMD

    HMD does it matter?

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    stay brite, wet rag
     
    newtech and pecmsg like this.
  3. frozensolid

    frozensolid Psychologist's Dream

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    I wrap strips of rag around the body an lay one over the head. Then I keep them wet. Real wet.

    I have done the stay brite thing but it cracks easier at lower temps.
     
  4. pecmsg

    pecmsg Junior my ASS

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    X 2 but dont need the wet rag, I have a small tip.......................................................



































































    :boid:
     
  5. pecmsg

    pecmsg Junior my ASS

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    Why replace the valve? Rebuild it in place!
     
    ub2slo likes this.
  6. jays 65

    jays 65 New Member

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    body with cool gel, wrap viper wet rag putty(make a donut) no issues dont even worry about it anymore
     
    Rather B Riding likes this.
  7. crackertech

    crackertech assholiness *

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    X2
     
  8. crackertech

    crackertech assholiness *

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    No comment :D
     
  9. crackertech

    crackertech assholiness *

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    Or just take the valve apart burn it in and reassemble
     
    Zman likes this.
  10. flange

    flange Act like you care and do SOMETHING!!

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    don't they sell valves with separate heads where you live. if not, just move the walls out for access. :lachen::lachen::lachen::lachen: pci5.jpeg
     
  11. Rather B Riding

    Rather B Riding Behind bars

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    I picked up a new valve and a new power head because the job was an hour outside town. New head was wrong size for the valve body. Couldn't get wrenches on it very well anyway. Didn't think it was coming off not enough room.
     
    404eh likes this.
  12. frozensolid

    frozensolid Psychologist's Dream

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    Why? Just burn it and go. They don’t burn up if you keep them wet.
    He likely already had the power head did not do it moment. :)
     
  13. pecmsg

    pecmsg Junior my ASS

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    You think that was directed to you?:D
     
  14. crackertech

    crackertech assholiness *

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    I almost never burnt in a valve as Paul said just rebuilt it in place with the guts out of a new one just make sure you run a drill bit through the push pin holes
     
  15. Rather B Riding

    Rather B Riding Behind bars

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    Think it might have been small tip??
     
    pecmsg likes this.
  16. Rather B Riding

    Rather B Riding Behind bars

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    Do you really burn them in without using a wet rags. I've never cooked a TXV got some a lot hotter than I wanted but they still worked. I have heard a lot of techs say they have cooked a few. And I cooked a reversing valve about 25 years ago. Maybe that's why I take all the precautions to keep them cool.
     
  17. pecmsg

    pecmsg Junior my ASS

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    With Sta Brite 8 it’s low heat.
     
    Rather B Riding likes this.
  18. crackertech

    crackertech assholiness *

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    StavBright 8 is for those that can’t Braze with the big boy’s,,, just saying.:stick:
     
    NZ All Blacks Fan likes this.
  19. pecmsg

    pecmsg Junior my ASS

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    and what do you know about Big Boys? :D
     
  20. crackertech

    crackertech assholiness *

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    :boid::chairshot: