How to determine the pressure difference before and after the control valve?
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I would like to ask how to determine the pressure difference before and after a control valve, and what impact the value of this pressure difference has on the control performance
This post was last edited by chinazwr on 2012-9-26 07:42. The pressure before the control valve is the system pressure minus the pressure loss in the pipeline leading up to the control valve, while the pressure after the control valve is the system pressure plus the pressure loss in the pipeline from the control valve to the rest of the system； Regulating valves have a large pressure difference, offering strong and sensitive control capabilities; however, even a slight movement of such valves results in significant changes. On the other hand, if the pressure difference is too small, the control ability is poor and the response is sluggish. Therefore, the pressure difference before and after the regulating valve should be kept as reasonable as possible to balance sensitivity and control performance. For systems involving liquid transfer pumps, a pressure difference of 0.02–0.03 Mpa is generally considered appropriate.
Reply to 2# chinazwr: Is the pressure difference you mentioned a bit high? Furthermore, the pressure difference should be set at 20% to 50% of the variable pressure drop (which is a good range), and there are relevant standards to guide this
Reply to 3# 100baomihua: Agree.
May I ask where the phrase “Standards for Reference” on the 3rd floor comes from?