What are the differences between multi-stage centrifugal pumps and single-stage centrifugal pumps in terms of operation and design?

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1. When controlling the outlet flow rate of a single-stage pump, the outlet valve can be used directly to adjust the flow rate at the pump’s outlet. In contrast, multi-stage centrifugal pumps typically have an auxiliary control circuit installed on the outlet pipeline to regulate the outlet flow rate. 2. With single-stage pumps, there is no need to worry about issues such as pump overpressure or gas entrapment. However, multi-stage pumps are particularly prone to gas entrapment. To prevent this phenomenon, the outlet flow rate of multi-stage pumps must reach a certain designed value, so that the liquid can carry away the heat generated by the rotating impeller. This is also why regulating circuits are usually installed at the outlet of multi-stage pumps. Are there any other insights and understandings that everyone would like to share?