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  1. #1
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    flow rates, temperature and pressure - valves questions



    Many questions with so little space.

    Flow through a valve is directly proportional to pressure and temperature?
    Liquid density, flow and pressure are directly related?

    Can anyone help with an array of questions i have.....

    pressure differential control valves - overview of operation and relation to pressure and temp ( is the temperature increase the pressure and therefore results in the regulation of flow?)

    double regulating valves - flow, temp and pressure?

    Anyone can help?



  2. #2
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    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: flow rates, temperature and pressure - valves questions

    Are you relating your questions to water flow through valves?
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

  3. #3
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    Re: flow rates, temperature and pressure - valves questions

    Brian
    thanks for your reply. Just wanted a synopsis of valves what systems to use them on and the relationships between the flow/pressure and temperature heat again across FCU/AHU coil....
    is there anything quick and easy as a chart or sheet to use for them....
    constant flow regualtors on constant flow systems
    PICV's on variable flow systems

    That kind of thing...

    Cheers

    ACP

  4. #4
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    Re: flow rates, temperature and pressure - valves questions

    Hi, andrew20441

    Quote Originally Posted by andrew20441 View Post
    Brian
    thanks for your reply. Just wanted a synopsis of valves what systems to use them on and the relationships between the flow/pressure and temperature heat again across FCU/AHU coil....
    is there anything quick and easy as a chart or sheet to use for them....
    constant flow regualtors on constant flow systems
    PICV's on variable flow systems

    That kind of thing...

    Cheers

    ACP
    try this link ....

    http://www.danfoss.com/North_America...ts/Categories/

    there is not a simple answer to your question ...

    of course there are always relations between pressure/temperature or pressure/flow ...


    here you have (if you want) some software to download ...

    http://www.danfoss.com/North_America...tion+Tools.htm


    hope this will be of some help to you ...

    Best regards, Josip

    It's impossible to make anything foolproof because fools are so ingenious...

    Don't ever underestimate the power of stupid people when they are in large groups.

    Please, don't teach me how to be stupid....
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  5. #5
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    Re: flow rates, temperature and pressure - valves questions

    ok thats good.
    If the valve authority ratio is high eg: 0.9 what is the main cause/effect?
    if the valve authority is too low...eg 0. what is the main cause/effect?

    Any help would be good.
    Andrew

  6. #6
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    Re: flow rates, temperature and pressure - valves questions

    Andrew: You have a good sized topic here. A whole lot dependent on the role of the valves....But to

    http://w3.usa.siemens.com/buildingte...rol-valves.pdf

    http://www.watsonmcdaniel.com/2011Ca...eeringData.pdf

    The second one will get you a lot of data in tabular form but the basic equations for control valves is on about the 5th and 6th pages.

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