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Thread: orfice or txv

  1. #1
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    orfice or txv

    i was asked a good question, whats the diffrance between the distrubuter orfice and the txv , which one is the mettering device, i found a unit that did not have txv valve , or a any kind of crimmped orfice in the inlet of the unit, this unit is a in a house.

  2. #2
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    the txv adjusts according to evaporator conditions, the orifice does not, it's fixed, they're both metering devices.
    If everything was always done "by the book"....the book would never change.

  3. #3
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    HVAC Student

    The TXV is the metering device. It regulates the superheat. The distribution orfice allows the refrigerant gas to be evenly shared through the evap coil.

  4. #4
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    Quote Originally Posted by newbeetech View Post
    i found a unit that did not have txv valve , or a any kind of crimmped orfice in the inlet of the unit, this unit is a in a house.
    You will have some type of "metering device" in every system. The TXV will control the amount of liquid entering the evaporator to control the amount of superheat at the outlet of the evaporator.

    All other fixed metering devices operate in one degree or another as a pressure reducing device. If sized properly they will maintain an acceptable superheat under design conditions only.

    As was mentioned before, if you're talking about the actual "distributor orifice" then it does not regulate the total flow but ensures that each circuit of the evaporator receives the same amount as the others.
    keep your ice cold and flame hot

  5. #5
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    Good answer Dawgtchrr. I have now idea what a "crimped orifice" is.

    As you say, a distributer is not a metering device. It may have an orifice inside (such as Sporlan does). As you say, the distributer's fuction is to "distribute" an equal amount of refrigerant into each "circuit" of the indoor coil. Distribution problems happen and are a lot of fun to diagnose. Separates the men from the boys.
    Lynn
    Last edited by lynn comstock; 05-19-2007 at 05:47 AM.
    "I have never let my schooling interfere with my education."
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  6. #6
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    Are you confusing distributor tubes, with capilary tubes.

    Or an old Lennox unit that uses the LL for the metering device.
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  7. #7
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    If you find one with no orfice at all then just squeeze the liquid line with a pair of channel locks until the pressures look ok. Then leave a little note that says, "you wanna hack? Then fine I can hack too".
    "And remember my sentimental friend......that a heart is not judged by how much you love, but by how much you are loved by others" - Wizard of Oz.

  8. #8
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    you mean one with out a metering device? like a txv valve, and the unit had 1/4 inch distrubuters but no metering device, but i think you have a point about squizing the liquid line till my psi look oky, mmm never thouth of that, i will try it, thank you

  9. #9
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    Quote Originally Posted by Steve Wiggins View Post
    If you find one with no orfice at all then just squeeze the liquid line with a pair of channel locks until the pressures look ok. Then leave a little note that says, "you wanna hack? Then fine I can hack too".
    Steve quit giving away all my trade secrets, I have a special pair of pliers that the squeeze adjustment will allow me squeeze the line from a 93 piston size down to a 54.
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  10. #10
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    Quote Originally Posted by newbeetech View Post
    you mean one with out a metering device? like a txv valve, and the unit had 1/4 inch distrubuters but no metering device, but i think you have a point about squizing the liquid line till my psi look oky, mmm never thouth of that, i will try it, thank you
    i wouldnt,i would bet you there is a metering device on the line just before the cap tubes or distributor..
    what size is the liquid line?...when it enters the evap..what type of connectio is there

  11. #11
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    very funny MRBILLPRO " special pliers" you really think i would ask you for the special pliers. h a ha ha, uuugggg oky oky , where can i get one? lo lo lo

  12. #12
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    Quote Originally Posted by newbeetech View Post
    very funny MRBILLPRO " special pliers" you really think i would ask you for the special pliers. h a ha ha, uuugggg oky oky , where can i get one? lo lo lo

    I do have a special pliers I've used for that on acouple occasions.
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  13. #13
    Quote Originally Posted by newbeetech View Post
    i was asked a good question, whats the diffrance between the distrubuter orfice and the txv , which one is the mettering device, i found a unit that did not have txv valve , or a any kind of crimmped orfice in the inlet of the unit, this unit is a in a house.

    What you found was likely a capillary tube style metering system.

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