What the factors consider when sizing control valve for oil and water separator outlet , as an example in my process plant , separator oil outlet is 10 inch and installed control valve is 6 inch while the water outlet 8 inch and installed control valve is 6 inch . is the above related to upstream & downstream pressure and flow rate only or there is another fatores? what is the bad effect rather than economic if i want to increase the control valve sizing to decrease pressure losses . another example there is a 4 inch control valve on 12 " discharge of transfer pump which lead huge pressure losses at this control valve so what about if i replace this valve by 8 inch or 10 inch valve
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