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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
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  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

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    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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