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One way valve is there a kind like this?

  1. Feb 13, 2016 #1
    Is there one way valve that allows a liquid flow in one direction and prevent air flow (under pressure) in the other direction?

    Thanks for any help ...
  2. jcsd
  3. Feb 13, 2016 #2


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    You could just look this up .

    I'll give you some keywords :

    Check valve
    One way valve
    Ball valve
    Clack valve
    Non return valve
  4. Feb 13, 2016 #3
    There are check valves with resilient seats which will accomplish this.
  5. Feb 13, 2016 #4
    Does the valve have to differentiate between liquid and gas (air)? does it have to allow liquid to flow back but not air?

    if it can allow liquid to flow back but not air, depending on the pressure you could have a floating ball on top of an orifice, when the flow reverses the ball will stay floating until the liquid level drops, at which point the ball will cover and seal the orifice. if neither liquid or gas need to be allowed to backflow, pretty much any of the valves Nidium listed would work fine.
  6. Feb 13, 2016 #5


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    Staff: Mentor

  7. Feb 13, 2016 #6


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    Here we go again, trying to help people that refuse to post enough information to actually have a possibility of getting appropriate answers from forum members.
  8. Feb 14, 2016 #7


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    You have asked this question previously on PF and on at least one other forum . Each time you have had useful answers .

    This seems to be your actual problem :

    It seems from this brief description that you want a valve with some active control features rather than one which is just self acting . This has been suggested before :

    If you would like to describe your problem more completely we could probably give you some better answers .
  9. Feb 15, 2016 #8


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    Marokay - you asked virtually the same question on this forum over a year ago. Have you considered giving up on the project?
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