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How does a Soap dispenser work

  1. Oct 6, 2012 #1
    1. The problem statement, all variables and given/known data
    My soap dispenser does not work, but when i block the pump end the soap comes out, can someone explain to me why?


    2. Relevant equations
    I am looking for a relevant equation to prove why it doesn't work


    3. The attempt at a solution
     
  2. jcsd
  3. Oct 6, 2012 #2

    CWatters

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    Science Advisor
    Homework Helper

    Some types of valve need back pressure to seal properly. Perhaps that's the explanation?
     
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