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Reduce pressure from high pressure receiver to low pressure receiver

  1. Jun 13, 2015 #1

    y2j

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    if one want to reduce pressure from high pressure receiver to low pressure receiver for example in the range of (0 to 10 bar) what he must to do?
    any valve can use it for this task?
     
  2. jcsd
  3. Jun 15, 2015 #2

    jack action

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    Is this what you need?
    http://www.hydroprocess.fr/images/amplification-pression.jpg [Broken]​

    If you need to keep the same fluid on both side, it can be transformed into a proportioning valve by putting a hole through the piston and a metering valve at the inlet (in orange) like this:

    reduction-pression.jpg

    Every time P2 increases, it pushes the piston and opens the metering valve. As the pressure P1 builds up, it moves the piston back and closes the metering valve. A greater P2 needs to be created to open it again and increase P1 again (which is always smaller than P2 according to the diameter ratio). Brake systems use a similar valve, except that there is a spring acting on the piston (in the white zone) such that the pressure ratio is 1:1 up to a threshold pressure and then the proportioning starts once P1 X S1 is greater than P2 X s2 plus the spring force, which give an output as shown below (the valve shown can adjust the spring preload with the lever and thus change the threshold pressure):

    tilton-lever-type-proportioning-valve.jpg
     
    Last edited by a moderator: May 7, 2017
  4. Jun 16, 2015 #3

    y2j

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    thanks
    if I use a hand valve it could reduce pressure from (5 bar) to (1bar) (hand valve only not contain a spring regulator)?
    Is this true ?
     
  5. Jun 16, 2015 #4

    jack action

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  6. Jun 16, 2015 #5

    y2j

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    OK my sir thanks again
    Is hand valve can yield this pressure drop (5bar ) to (1bar) if the outlet flow is reduced to a very small amount comparing with that at inlet?
     
  7. Jun 16, 2015 #6

    jack action

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    If you close the valve completely, you can reduce the output pressure to zero!
     
  8. Jun 16, 2015 #7

    y2j

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    if closing the valve occurs gradually what happen ?
     
  9. Jun 17, 2015 #8

    jack action

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    The output pressure (and flow) reduces gradually.
     
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