To deal with the problem of air entering the multistage centrifugal pump, it is necessary to comprehensively consider multiple factors and take corresponding measures according to the specific situation. Pay attention to safety during the processing and ensure that the operating specifications are correct.

As a common liquid conveying equipment in modern industry, the stable operation of pneumatic diaphragm pumps is of great significance to production efficiency. However, pneumatic diaphragm pumps often encounter the problem of being unable to pump out liquid in actual use, which not only affects production efficiency, but may also cause damage to the equipment. Therefore, this article aims to explore the reasons why the pneumatic diaphragm pump cannot pump liquid and propose corresponding solutions.