The Difference Between Centrifugal Pump and Self-priming Pump

Centrifugal pump

Centrifugal pumps and self-priming pumps are vital components in various industrial and agricultural applications, each offering unique advantages and functionalities. Understanding the differences between these pumps is crucial for selecting the most suitable option for specific needs.


    • Centrifugal pumps: These pumps consist of six essential parts, including an impeller, pump body, sealing ring, and stuffing box, designed to facilitate efficient liquid transportation.
    • Self-priming pumps: Structured with specialized components such as a suction chamber, oil storage chamber, vortex chamber, liquid return hole, and gas-liquid separation chamber, self-priming pumps are engineered for easy startup and reliable performance.

Startup Methods

    • Centrifugal pumps: Initiating operation requires filling the water inlet pipe and the pump body with water or employing auxiliary equipment to introduce air into the inlet pipe.
    • Self-priming pumps: Activation involves adding a suitable amount of circulating water to the pump body, streamlining the startup process and ensuring rapid functionality.

Equipment Requirements

    • Centrifugal pumps: Installation typically involves incorporating a bottom valve or air extraction equipment under the inlet pipe to optimize performance and efficiency.
    • Self-priming pumps: While a filter screen under the water inlet pipe is necessary, self-priming pumps eliminate the need for a bottom valve, simplifying installation and maintenance requirements.


    • Centrifugal pumps: Versatile and robust, centrifugal pumps find widespread use in liquid transportation, cooling systems, industrial cleaning processes, aquaculture, and various industrial applications.
    • Self-priming pumps: Ideal for agricultural settings, self-priming pumps efficiently convert water into fine raindrops for spraying in farmlands, nurseries, orchards, and other agricultural environments. They can handle a diverse range of fluids, including clearwater, seawater, chemical solutions, and slurries.


    • Centrifugal pumps: Renowned for their compact design, high flow rates, stable operation, and cost-effectiveness, centrifugal pumps offer a reliable solution for diverse fluid-handling requirements.
    • Self-priming pumps: Featuring a compact structure, user-friendly operation, stability, easy maintenance, and extended service life, self-priming pumps are favored for their efficiency and reliability in agricultural applications.

The Choice

While both centrifugal and self-priming pumps play crucial roles in fluid transportation and handling, selecting the right pump depends on specific operational requirements and environmental factors. While self-priming pumps excel in scenarios demanding rapid startup and efficient fluid transfer, centrifugal pumps offer versatility and reliability across a broad spectrum of industrial applications.

By understanding the distinctions outlined above, businesses and individuals can make informed decisions when choosing between centrifugal and self-priming pumps, ensuring optimal performance and efficiency in their operations.

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