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  1. #1
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    Apr 2017
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    Manual expansion valve



    I知 looking to construct my own refrig system using r404. I want to be able to change the temperature of the evap coil. I知 looking to to vary between-30c and -50c. I知 prob going to use a compressor between 1/3 and 2/3 hp.

    Is there something on the market that exists? Does it have to be packless? I could use a cap tube, but it would be a lot of guess work as I壇 like to use salvaged parts.

    Thanks!

    1001yos



  2. #2
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
    Join Date
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    Re: Manual expansion valve

    I would suggest an electronic expansion valve but it might not be cost effective.

    Although you might be able to salvage an EEV from a modern AC unit you will have to either invest in a controller for it or build your own.
    Last edited by Brian_UK; 19-04-2019 at 12:03 AM.
    Brian - Newton Abbot, Devon, UK
    Retired March 2015
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  3. #3
    Join Date
    Aug 2006
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    england
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    Re: Manual expansion valve

    Have a look for a suitable 'Automatic Expansion Valve', they control the flow to the evaporator by maintaining a set pressure which you can adjust maunally.
    Mostly found in Oxfordshire, UK :)

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