Useful Information on self-priming pump

Posted by angroup on February 8, 2023

What is a self-priming pump?

Self-priming centrifugal pumps are able to start functioning without having to be manually filled with liquid because they can remove air and vapor mixes from the suction line. These pumps are frequently used in applications including water treatment, irrigation, wastewater management, and chemical processing since they are built to start and run without the requirement for an external liquid source. The impeller, volute casing, suction and discharge ports, and mechanical seal are the main parts of a self-priming pump. Air and vapor mixtures can be sucked into the pump through the low-pressure area the spinning impeller creates, where they are separated and released through the discharge port, allowing the pump to keep running.


How do the self-priming pumps work

Self-priming pumps work by creating a low-pressure zone in the suction line and drawing air and vapor mixtures into the pump via the impeller, suction, and discharge ports. This process is known as "priming the pump." The rotation of the impeller causes a flow of liquid to be discharged through the discharge port, resulting in a low-pressure area.
The ongoing recirculation of the liquid inside the pump produces a self-sustaining flow after the pump has been primed. The liquid is sucked back into the suction port and circulated, while the air and vapor mixtures are separated and discharged via the discharge port by the impeller.

The impeller, volute casing, suction and discharge ports, and mechanical seal are the main parts of a self-priming pump. The liquid flow is produced by the rotating impeller, while the volute casing aids in controlling the liquid flow and offers structural support. The mechanical seal helps to avoid leakage and reduce maintenance needs. The suction and discharge ports are the inlets and exit for the liquid, respectively.

In conclusion, self-priming pumps function by drawing air and vapor mixtures into the pump, where they are separated from the liquid, and then ejected through the discharge port. This is done by utilizing the low-pressure area formed by the spinning impeller. This enables the pump to continue working without requiring a liquid source outside of it.

Self-priming pumps' capacity to function without an external liquid source is one of their main advantages. Because of this, they are perfect for applications where a consistent liquid source isn't always accessible, like in rural or water-scarce areas. Self-priming pumps can also start and run quickly.

Need help selecting the right self-priming centrifugal pump for your application?
Contact us at or +86 15032857866;
Our technical sales engineers have the extensive product knowledge and will be able to help you.

linkedin facebook pinterest youtube rss twitter instagram facebook-blank rss-blank linkedin-blank pinterest youtube twitter instagram