Chemical Pump Encyclopedia

Self-priming centrifugal pump working principle and application


Self-priming pumps are a special type of liquid pump. They are designed for fluid movement and transfer and can increase the efficiency of many pumping applications.

Working principle of self-priming centrifugal pump

Self-priming centrifugal pumps are capable of automatically removing air from inside the pump, enabling the suction and transfer of liquids. The working principle is based on the following key steps:

  1. Preparation before starting: Before starting a self-priming centrifugal pump, the pump body is usually filled with liquid. If the pump body is not pre-filled with liquid, the pump will first perform a self-priming process when starting.
  2. Self-priming process:
    • Starting the pump: When a self-priming centrifugal pump is started, the impeller begins to rotate.
    • Creating a vacuum: The rotating impeller directs the air in the pump body out of the pump through the outlet, thus creating a localized vacuum area near the suction port of the pump body.
    • Suction of Liquid: Due to the vacuum at the suction inlet of the pump body, atmospheric pressure pushes the liquid inside the pump body, replacing the expelled air.
    • Liquid Circulation: As the pump continues to run, the suctioned liquid is driven and accelerated by the impeller and then discharged through the pump outlet.
  3. Normal operation: Once the pump body is filled with liquid, the self-priming centrifugal pump will operate like a normal centrifugal pump, transferring the liquid from the suction to the outlet through the rotation of the impeller.

Application areas of self-priming centrifugal pumps

Self-priming centrifugal pumps can be applied in many fields due to their versatility, including but not limited to:

  • Water supply and treatment: for urban water supply systems, industrial water treatment, etc.
  • General industrial and manufacturing uses: for liquid transportation in factory production processes.
  • Chemical and Mining Uses: for chemical transportation in chemical production and mining processes.
  • Food & Beverage: for liquid transportation in food processing and beverage production.

QEEHUA PUMP products and services

QEEHUA PUMP offers self-priming centrifugal pumps with the following advantages:

  • High-quality products: advanced design and manufacturing processes are adopted to ensure high quality and reliability of the products.
  • Customized service: according to the specific needs of customers, provide personalized pump selection program.
  • Professional technical support: with a team of high-quality pre-sale and after-sale engineers, we are able to provide timely technical support and after-sale service for our customers.


QEEHUA PUMP is committed to providing customers with high-quality, reliable self-priming centrifugal pumps, providing efficient, safe and reliable solutions for liquid transportation in various industries. We understand the needs and concerns of chemical fluid transfer in various industries, and are able to provide our customers with scientific pump selection programs to protect their production and operations.