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Thread: txv vs. pistons

  1. #1
    Join Date
    Jun 2005
    Posts
    64
    what are the differences between how a piston or txv modulates refrigerant flow? what are the pros and cons of both ~~just curious~~

  2. #2
    Join Date
    Apr 2005
    Location
    NE PA
    Posts
    698
    Quick answers: piston is a fixed oriface which is perfectly optimized at only one set of operating conditions. TXV is a modulating valve that varies the expansion flow of the refrigerant by a balance of liquid line pressure and vapor line temperature. TXV provides a better metering of refrigerant as conditions (temperatures and heat load) vary.

    TXV: more complex, can fail due to a number of reasons, better load matching, thus higher potential SEER

    Piston: Simple, cheap, virtually no failures other than clogging, less than optimal mereting in varying conditions.

    paul

  3. #3
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,106
    Hey, I like those pistons they work really well with a variable speed compressor.
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  4. #4
    Join Date
    May 2002
    Location
    Colorado
    Posts
    697
    And TXVs are far more forgiving of charging errors when Mr. Bill does it by pressures alone.

  5. #5
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,540
    Originally posted by Panama
    And TXVs are far more forgiving of charging errors when Mr. Bill does it by pressures alone.
    Hey!

    He keeps a cold beer in his hand to double check his charge. LOL...

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