1. The efficiency of the sanitary pump marks the efficiency of the centrifugal pump and reflects the utilization of the negative pressure pump on the power machine. It is usually expressed by the symbol η, and its height is measured by %. If the various loss powers in the pump are relatively small, then the efficiency of the pump is high, and the required shaft power is small; on the contrary, when the various loss powers in the pump are relatively large, the efficiency of the pump is low, and the required shaft The power is large, indicating that the quality of this pump is poor and the matching is unreasonable. It can be seen that efficiency is a very important technical and economic indicator to measure the performance of a pump. The efficiency indicated on the nameplate refers to the highest efficiency that this pump can achieve when running at the rated speed.