Reasons for an increase or decrease in the pump outlet pressure during the operation of a centrifugal pump
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What are the reasons for the increase/decrease in pump outlet pressure during the operation of a centrifugal pump, and what are the solutions?
Is there a control valve downstream of the centrifugal pump? If there is a control valve, it is normal for the pump outlet pressure to change as the control valve operates. If there is no control valve and the downstream pressure remains stable, it may be air entering the pump.
Reply to 2# cl6119: Generally, this is considered in the case where there is a control valve downstream! Does the outlet pressure of a centrifugal pump always fluctuate as the downstream outlet valve is opened or closed?
Reply to 3# 465204459: Yes, yes. Generally, the outlet pressure of a centrifugal pump fluctuates as the downstream outlet valve is opened or closed ； Increase in pressure when the valve is closed ； The valve opening pressure decreases.
There is a valve downstream of the centrifugal pump, and the pressure at the pump outlet changes as the valve operates. If the pressure downstream remains stable, it is likely that air has entered the pump, causing the pressure at the pump outlet to drop.