Control valve accuracy
Control valve accuracy
(OP)
Hi all,
does anyone have a good reference for the principals of operation of control valves? I am wondering how the pressure drop accross a modlating contro valve effects flow. If I have a low pressure drop will I have poor control. Higher pressure drop = greater control accuracy?
Thanks
does anyone have a good reference for the principals of operation of control valves? I am wondering how the pressure drop accross a modlating contro valve effects flow. If I have a low pressure drop will I have poor control. Higher pressure drop = greater control accuracy?
Thanks





RE: Control valve accuracy
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Control valve accuracy
My understanding is that the accuracy of control depends on a number of things, such as the charateristics of the valve, positioner, actuation etc. and does not depend on the pressure drop. The smaller the pressure drop the larger the valve, the larger the pressure drop the smaller the valve.
RE: Control valve accuracy
RE: Control valve accuracy
But the issue won't be what the valve manufacturer publishes, it the hysteresis from friction on the mechanical links that will be precieved as accurracy.