Minimum inlet pressure of centrifugal pump

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Generally, books and online sources state that a negative pressure is generated at the center of the impeller during the operation of a centrifugal pump. Personally, I believe that as long as the inlet pressure is sufficient to meet the required outlet flow rate, no negative pressure will be created in the pump. What happens is that due to losses in pressure along the inlet pipeline and an increase in fluid velocity at the center of the impeller, the pressure there decreases – it becomes lower compared to the inlet pressure. For example, if the inlet pressure of a centrifugal pump is 0.5 MPa, then the pressure at the center of the impeller should also be around 0.3 MPa (this is just an example); the pressure at the center of the impeller should still be positive, not negative as stated in some books. \ud83d\ude04\ud83d\ude04 What are everyone’s thoughts on my opinion? \ud83d\ude0a\ud83d\ude1c\ud83d\ude1c\ud83d\ude1c\ud83d\ude1c