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  1. #1

    Brazing brass distributor body to a copper TXV port

    I need to braze a large (12 port) distributor block to a TXV body. I was wondering if anyone has any input on the pro's/con's of the different joining methods? I've silver soldered smaller distributors in heat pumps and have also used Stay-Brite 8 on occasion as well as brazing rod. Just looking for some other opinions. The system this assembly will be installed in uses r-22 and this joint would obviously be on the low pressure side of the valve. I'm concerned about the amount of heat I would have to use to get 45% silver to flow with a brass distributor this large. Thanks for any input.

  2. #2
    Join Date
    Jul 2009
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    In a mechanical room....
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    1,888
    45% and a rosebud.
    “It takes courage to grow up and turn out to be who you really are.”

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  3. #3
    Join Date
    Jan 2008
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    windy city
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    4,430
    stay brite #8
    \m/
    original member of the racoon brotherhood

  4. #4
    Join Date
    Apr 2005
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    where the beer flows like wine
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    2,871
    I have done it both ways and prefer staybrite 8, it takes a little longer cause fluxing and cleaning but it flows good and its way cheaper the 45%, another pricey alternative is to use flux coated 56% rods.

  5. #5
    Join Date
    Dec 2000
    Location
    Flat Rock, NC
    Posts
    463
    I always use 56% and flux w/ a 3" pipe section connected to distributer then its just a simple, quick copper to copper joint at txv w/ standard rod. This greatly reduces the chance of overheating valve. Do the dist. first then connect valve.

  6. #6
    Join Date
    Dec 2007
    Location
    houston, texas
    Posts
    3,787
    Quote Originally Posted by codgy View Post
    I always use 56% and flux w/ a 3" pipe section connected to distributer then its just a simple, quick copper to copper joint at txv w/ standard rod. This greatly reduces the chance of overheating valve. Do the dist. first then connect valve.
    Ditto, if you have the room.
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  7. #7

    Brazing Distributor

    Thanks to all who replied. I think I'm going to use 45%. Thanks for the input.

  8. #8
    Join Date
    Dec 2005
    Posts
    1,915
    soft soldering (not recommend for heat pump). It has been done for 1/2 century.

  9. #9
    Join Date
    Dec 2004
    Location
    newton,mass.
    Posts
    6,109
    Quote Originally Posted by oneofthesedays View Post
    I need to braze a large (12 port) distributor block to a TXV body. I was wondering if anyone has any input on the pro's/con's of the different joining methods? I've silver soldered smaller distributors in heat pumps and have also used Stay-Brite 8 on occasion as well as brazing rod. Just looking for some other opinions. The system this assembly will be installed in uses r-22 and this joint would obviously be on the low pressure side of the valve. I'm concerned about the amount of heat I would have to use to get 45% silver to flow with a brass distributor this large. Thanks for any input.
    I use stay brite 8 it's as good and as strong as the others with less heat. Also if you want or have to pull that valve down the road it's easier.


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  10. #10
    Join Date
    Feb 2011
    Location
    colorado mountians
    Posts
    117
    Sta-brite 8. Flux on then wipe off and solder as norm, damp rag will help keep txv cool. All the training modules at the hall are assembled with it from the factory.

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