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19-04-2014, 06:12 AM #1
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?
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19-04-2014, 10:23 PM #2
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
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20-04-2014, 04:47 AM #3
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
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22-04-2014, 10:01 AM #4
Re: flow rates, temperature and pressure - valves questions
Hi, andrew20441
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....
No job is as important as to jeopardize the safety of you or those that you work with.
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24-04-2014, 02:27 AM #5
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
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29-04-2014, 09:09 PM #6
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.