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  1. #1
    Join Date
    Jul 2010
    Location
    Catoosa, OK
    Posts
    32

    Textbook question - piercing valves

    Hello all,

    I've been looking through my HVAC textbook between semesters and read that piercing valves should be removed once system access is no longer needed. This of course goes for the non-permanent type but my question is, how on earth do you remove a piercing valve and not lose your refrigerant? What am I missing here that the textbook does not cover?

  2. #2
    Join Date
    Jul 2001
    Location
    Southern NJ
    Posts
    1,241
    My only guess is that it's talking about the plier-type piercing valves that lock onto a refrigerant line like a pair of vice grips.

    These are used to evacuate small equipment like window units or refrigerators when you're going to dispose of them.

    I agree, every type of piercing valve will leave a hole and can't just be removed (unless the refrigerant already was)
    Ryan
    Maintenance Guy
    -----------------
    naysayer, skeptic, conspiracy theorist

  3. #3
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,596
    Here's the best answer I can think of...Don't work on anything that requires any of that stuff!!! Window units suck.

  4. #4
    Join Date
    Jul 2010
    Location
    Catoosa, OK
    Posts
    32
    Lol...true. I was given a 2 ton window unit that the previous ho put a screw through the coil. BRand new otherwise but I would like to attempt a fix and install in my shed.
    Quote Originally Posted by ryan1088 View Post
    Here's the best answer I can think of...Don't work on anything that requires any of that stuff!!! Window units suck.

  5. #5
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,596
    Quote Originally Posted by myngos211 View Post
    Lol...true. I was given a 2 ton window unit that the previous ho put a screw through the coil. BRand new otherwise but I would like to attempt a fix and install in my shed.
    Ok I can see your point there. I would get the taps that you braze in, pierce, then do what you need to do and leave it in there. All the other ones are prone to leak. If you really want an adventure then try doing all your work from the process tube off of the compressor!

  6. #6
    Join Date
    Jul 2010
    Location
    Catoosa, OK
    Posts
    32
    I'm now thinking that what they failed to mention is that a tech can use a piercing valve to access the system in order to evacuate, install permanent service valves and make any necessary repairs before charging.

  7. #7
    Join Date
    Oct 2010
    Location
    SW Michigan, near Battle Creek
    Posts
    921
    well it already has big blue sky recovery so braze in real service valves.

  8. #8
    Join Date
    Feb 2001
    Location
    N.E. Iowa
    Posts
    314
    They are intended for small appliances such as refrigerators or window units.

    Place the piercing valve near the end of the process stub on the appliance. After service is complete pinch off process stub, remove piercing valve and re-seal stub with soft solder.

    No refrigerant will be lost.
    ______________________________________________

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  9. #9
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    Use this, no need to remove.



    This one needs to be removed, it will leak.

    Karst means cave. So, I search for caves.

  10. #10
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,596
    Quote Originally Posted by karsthuntr View Post
    Use this, no need to remove.



    This one needs to be removed, it will leak.

    That's just what I was talking about!

  11. #11
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    Quote Originally Posted by ryan1088 View Post
    That's just what I was talking about!
    Pictures make it more better.
    Karst means cave. So, I search for caves.

  12. #12
    Join Date
    Apr 2005
    Location
    Australia : Queensland
    Posts
    804
    Manitowoc requires you to use one of these so as to not interfere with the charge , they do work.

    The primary function of the design engineer is to make things difficult for the fabricator and impossible for the serviceman.

  13. #13
    Join Date
    Jul 2010
    Location
    Catoosa, OK
    Posts
    32
    Thanks for all the replies. Great pics too.

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