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Thread: How to go from 1/2" copper to 1/4" compression fitting, with a ball valve inbetween

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  1. #1
    DIY Junior Member Studly's Avatar
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    Default How to go from 1/2" copper to 1/4" compression fitting, with a ball valve inbetween

    To hook up my furnace humidifier, I want to put in a T (sweat connection) in my 3/4" copper pipe that comes out of my water heater, so it comes out to a 1/2" on the side, which will eventually hook up to the 1/4" compression fitting that joins my flexible copper tubing to the humidifier.

    I definitely want to put in a ball valve straight stop in between the 1/2" copper and 1/4" compression fitting.

    What's the easiest way to do this? I went to 2 Home Depot stores and they both pieced together about $20 worth of fittings, going from 1/2" copper to threaded fittings to compression.

    In other forums, they recommended going with a 5/8" compression x 1/4 compression straight ball valve, which is a great idea, but I can't find that in any stores here in suburban Minneapolis.

    Can someone recommend the easiest and best way to do this, with parts I can easily find? Thanks much for your recommendations!
    Last edited by Studly; 11-02-2011 at 06:34 PM.

  2. #2
    In the Trades Jerome2877's Avatar
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    You could use a 1/2" x 3/8" 1/4 turn ball valve and run 3/8 to the unit and then use a 3/8" x 1/4" brass reducing coupling where it connects to the unit.

  3. #3
    General Engineering Contractor ballvalve's Avatar
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    Use a 5$ saddle valve for humidifiers [!] and coolers and you'll be done in a half hour.

    At least for a fridge, its best to shut off the water and DRILL a proper size hole for good flow. The self piercing is doable for a humidifier, but drilling is always best.

    Plumbers like to say they are a hack and dangerous, but done right and left exposed are great tools.


    http://www.filtersfast.com/P-Aprilai...FSYaQgodRlkdPw

    http://www.idealtruevalue.com/servlet/the-12936/Detail


    http://www.google.com/products/catal...d=0CHQQ8wIwBw#

    This is an application that really does not require a ballvalve.

    You must have hit the wrong forums. After many years in HVAC, thats what they do for humidifiers. and a good reason not to shop at home depression stores.
    Last edited by ballvalve; 11-03-2011 at 01:16 AM.

  4. #4
    Moderator & Master Plumber hj's Avatar
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    quote; Use a 5$ saddle valve for humidifiers [!] and coolers and you'll be done in a half hour.

    REAL GOOD ADVICE!!!! Not. we have been telling people to get RID of their Saddle valves for YEARS, and now you tell them to install one? What is the problem? Just use a 1/2" x 1/4" straight or angle compression valve. ANY device can use a 1/4 turn "ball" valve.
    Last edited by Terry; 11-04-2011 at 11:51 AM.
    Licensed residential and commercial plumber

  5. #5
    General Engineering Contractor ballvalve's Avatar
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    I find it funny that our water heaters flex pipe seals depend totally upon the same piece of rubber as the saddle valve.

    Yet no plumber would suggest that is a problem.

    Thats not counting the 30 or 40 washers on your flex hoses in the house, the toilets tank donut, and the washing machine hoses..

    Seems like saddle valves get a bad rap for no reason at all, especially if one drills a hole for it.

  6. #6
    DIY Senior Member JerryR's Avatar
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    This my ice maker tap off the 3/4" water heater input line. It was installed many years ago. Today I prefer all ball valves. This could easily be replaced with a ball valve one day if had the notion to do so.

    Jerry
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  7. #7
    DIY Senior Member Fubar411's Avatar
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    Default Funny though

    Here in St Louis, you can't have your main shut off be a 1/4 turn ball valve. I heard the justification is that would be too hard on the street connections. But hey, it is only the most important shut off in your house, right?

  8. #8
    Moderator & Master Plumber hj's Avatar
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    quote; Here in St Louis, you can't have your main shut off be a 1/4 turn ball valve. I heard the justification is that would be too hard on the street connections

    That is a "stupid" justification, so therefore, someone there owns a gate valve manufacturing company.
    Licensed residential and commercial plumber

  9. #9
    Forum Admin, Expert Plumber Terry's Avatar
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    Saddle valves are notorious for being undersized, and flimsy.
    As a plumber in the field, we use shutoffs made for that purpose, not a flimsy saddle valve which will only come back to bite you.

    It's not the rubber that is the issue, it's the valve.

  10. #10
    General Engineering Contractor ballvalve's Avatar
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    Here is an interesting one - heavy duty with a 1/2" male fitting for a water heater expansion tank, or a valve. No cheap valve to bite you later.

    Nice quality brass:

    http://www.acehardwareoutlet.com/pro...px?sku=4264420

    http://www.google.com/products/catal...d=0CHQQ8wIwBw#

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