Bad Check Valves
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  1. #1
    Join Date
    Jun 2007
    Location
    Williamsport, PA
    Posts
    164

    Bad Check Valves

    (7) brand new check valves on used display cases converted to hot gas would
    stick after defrost. New low temp rack was taking a slug.
    It would take about 3 hours after the late night defrost for enough liquid to get
    through the oriface to start filling the compressors. Txv's Just sitting there watching
    the refrigerant go by and could do nothing about it.
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  2. #2
    Join Date
    Oct 2005
    Location
    B.C. Canada
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    848
    That sucks! What brand valves?

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  3. #3
    Join Date
    Jun 2007
    Location
    Williamsport, PA
    Posts
    164
    Not sure what brand, but they were take apart angled spring checks. The piston was getting hung up on the bottom threads.

  4. #4
    Join Date
    Oct 2005
    Location
    B.C. Canada
    Posts
    848
    Weird.. that shiney new discus survive the slugs? What was the solution? New check valves?

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  5. #5
    Join Date
    Aug 2007
    Location
    Winter Haven, FL
    Posts
    4,203
    Its plainly obvious that the crankcase heater is not working .

  6. #6
    Join Date
    Aug 2007
    Location
    Winter Haven, FL
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    4,203
    So was installing the check valves easier than using an internal check in a txv?

  7. #7
    Join Date
    Jun 2007
    Location
    Williamsport, PA
    Posts
    164
    Quote Originally Posted by coolerik View Post
    Weird.. that shiney new discus survive the slugs? What was the solution? New check valves?

    Sent from my GT-P5113 using Tapatalk
    (7) New magna checks are working like a dream. CoreSense seemed to trip on oil pressure before comressors were damaged. Rack had digital Discus that did not trip it did not seem to get slugged as bad.

  8. #8
    Join Date
    Jun 2007
    Location
    Williamsport, PA
    Posts
    164
    Quote Originally Posted by Joe Harper View Post
    So was installing the check valves easier than using an internal check in a txv?
    I think it was easier to get the check valves than to get txvs, cheeper too I think. I have not tried internal check valve txv on hot gas defrost cases. Does it work well? That would save some piping.

  9. #9
    Join Date
    Oct 2005
    Location
    B.C. Canada
    Posts
    848
    Quote Originally Posted by Joe Harper View Post
    Its plainly obvious that the crankcase heater is not working .
    I was thinking the same thing.... must be on an aux contact, off while runnin

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  10. #10
    Join Date
    Aug 2007
    Location
    Winter Haven, FL
    Posts
    4,203
    Quote Originally Posted by johndief View Post
    I think it was easier to get the check valves than to get txvs, cheeper too I think. I have not tried internal check valve txv on hot gas defrost cases. Does it work well? That would save some piping.
    Actually, Going back through the txv is the only way its done down here. I never thought about using a separate check. As long as you have the differential valve set right it works fine.

  11. #11
    Join Date
    Oct 2005
    Location
    B.C. Canada
    Posts
    848
    Same thing really.. isnt it? Im still learnin markets ( just gettin a chance to dip my toes in ) already love hate relationship

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