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Aquatic Ecosystems needle valve

Discussion in 'General Plant Topics' started by darren_in_the_marsh, Apr 8, 2006.

  1. darren_in_the_marsh

    darren_in_the_marsh Junior Poster

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  2. VaughnH

    VaughnH Lifetime Charter Member
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    Re: Aquatic Ecosystems needle valve

    The description calls it a gate valve, which is hardly the fine metering valve we need with CO2. And, being plastic it isn't likely to have a fine taper needle in it. Plus, being plastic makes it likely to eventually fail from the CO2/carbonic acid environment.

    Otherwise, a great buy!! Heh, heh.
     
  3. Bill

    Bill Lifetime Charter Member
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    Re: Aquatic Ecosystems needle valve

    For $10 you could go ahead and get the Clippard MNV-4K2 needle valve.

    It works good, although I switched to the Swagelok on my reactor for accuracy I still use the Clippard on my mist.

    Bill
     
  4. Tom Barr

    Tom Barr Founder
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    Re: Aquatic Ecosystems needle valve

    The issue with plastic, thermal expansion.
    Metal's thermal exapnsion coefficient is extremely low, whereas plastic is very high.

    The gas cools as it's released from the tank, this and room temp changes can cause flow variation.

    These valves are nice for drip applications where accuracy is less critical.

    Regards,
    Tom Barr
     
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