The design principle of a cast iron centrifugal pump involves water spinning in the impeller to generate centrifugal force, which forces water outward along the casing walls, reducing pressure at the impeller's center.

The selection of water pumps for wastewater treatment in the petroleum industry is a complex process, which requires comprehensive consideration of factors such as wastewater properties, treatment process requirements, site conditions, economy and reliability. Through scientific and reasonable selection, it can ensure that the water pump performs at its best in the wastewater treatment system and improve the efficiency and quality of wastewater treatment.

Horizontal screw pumps and vertical screw pumps have their own advantages in performance. The choice of which type of pump depends mainly on the specific application scenario and needs. When purchasing, it is recommended to make a comprehensive consideration based on actual needs and choose the most suitable pump type.

The sealing performance of the gear pump has an important impact on its self-priming ability. Therefore, when designing and using a gear pump, its sealing performance should be fully considered, and corresponding measures should be taken to improve its sealing performance to enhance self-priming capacity.

There are many ways to improve the self-priming ability of the gear pump, and appropriate measures should be selected according to the specific situation. At the same time, when using the gear pump, you should also pay attention to regular maintenance and maintenance to ensure that it is in good working condition.

The self-priming ability of the gear pump exists but has limitations. In practical applications, it is necessary to fully consider various influencing factors and take corresponding measures to improve its self-priming performance to meet specific work requirements.

The gear pump has the working characteristics of strong suction capacity, continuous and uniform liquid supply, simple and compact structure, reliable operation, good lubrication performance and wide range of applicable media. These characteristics make gear pumps have broad application prospects in the field of liquid transportation.

Self-priming slurry pumps have strong capabilities in sewage treatment, but they also need to be selected and configured according to specific working conditions and medium characteristics.

With its unique performance and wide application fields, self-priming mud pumps play an important role in many industries such as petroleum, construction, environmental protection, and mining.

The reasons why a small self-priming pump cannot suck water may involve many aspects, which need to be investigated and resolved according to the specific circumstances.