Self Priming Centrifugal Pump - China

self-priming pump is a modified type of centrifugal pump, differing from conventional centrifugal pumps that require manual priming and air venting before startup.

With its built-in liquid reservoir due to its structural design, the self-priming pump eliminates the need for repeated water filling after the initial priming.

It can automatically draw liquid from below the pump's installation position, preventing air binding.

This type of pump is widely used in scenarios such as water supply and drainage, garden irrigation, sewage lifting, chemical dosing, and on-site pumping, where low-position pump installation or frequent start-stop cycles are impractical.

2、 Working principle

1 - First use: Add water intake

Fill the storage chamber of the pump body with liquid and close the exhaust port before the first operation, leaving a certain amount of working fluid in the storage chamber.

2 - Gas liquid mixture suction stage

The impeller rotates at high speed, throwing the water retained in the pump body towards the volute, creating negative pressure at the impeller inlet; The air in the suction pipeline mixes with the water in the pump at high speed, forming a mixture of gas and water, which is continuously pressed towards the gas-liquid separation chamber.

3 - Gas liquid separation

The gas water mixture enters the upper part of the separation chamber, and the gas with low density is discharged from the exhaust port.

The liquid falls back to the lower storage chamber of the pump by gravity to participate in gas-liquid mixing circulation.

4 - Normal water delivery

As the air inside the pipeline is continuously emptied, a vacuum is formed in the suction pipeline, and the liquid level is continuously sucked into the pump under atmospheric pressure.

The self-priming process is completed, and the pump enters the conventional centrifugal pump water delivery condition.

Core feature: After the first addition of water, sealing water will remain inside the pump casing, and there is no need to refill the pump again after subsequent shutdown and restart.

3、 Main structure

Self suction pump body (with gas-liquid separation storage chamber): Different from ordinary centrifugal pump volutes, the upper part is designed with a large capacity air-water separation chamber to store water and separate air;

Impeller: mostly closed impeller (for clean water self-priming pumps), open/double channel impeller (for sewage self-priming pumps);

Check valve (bottom valve/one-way valve inside the pump): Lock the water storage inside the pump after shutdown to prevent water from flowing back into the suction tank, ensuring that it can still self suction next time;

Exhaust plug and water inlet: add water for the first time and empty the air inside the pump;

Mechanical seal, motor, base.

5、 Core performance parameters

Self suction height: the most critical parameter, the rated self-priming height of a conventional self-priming pump is 4-6 meters (it is recommended not to exceed 5 meters in practice), which refers to the maximum vertical height from the center of the pump to the suction liquid level;

Flow rate, head, rated power voltage;

Self suction time: Generally completed within 30-120 seconds, exceeding the time indicates air leakage or water loss;

Medium temperature: conventional 0-80 ℃.

6、 Advantages

One time water filling, multiple start and stop without filling the pump, solves the problem of frequent pumping of ordinary centrifugal pumps, and eliminates the problem of gas binding and inability to suck water;

Flexible installation, can be installed on the ground or at high places, without the need to place the pump below the liquid level or build a pump room;

It can suck liquids containing a small amount of gas, and the pipeline can still work normally even with slight air intake;

Easy to maintain, highly versatile, with multiple working conditions to choose from for clean water, sewage, and chemical anti-corrosion.

Company Contact:

• Posted By: Kenshine Pump And Valve MFG Co.,LTD

• Phone: 862133592713

• Address: Yindu Road 1535,Minhang District, Shanghai, Shanghai , Shanghai , China

• Email:

• Website: http://www.kenshine-pump.com

• Business Description: Manufacturer and sales for various pumps such as centrifugal
  
  pump, industrial pump, chemical pump, submersible pump, self priming
  
  pump, diaphragm pump, electromagnetic pump, gear pump, multistage pump etc
  
  KENSHINE PUMP&VALVE MANUFACTURING CO., LTD is the integrated enterprise specializing in research and development and design and produce and sales of pump and valves.
  
  KENSHINE PUMP&VALVE MANUFACTURING CO., LTD locates in MINHANG industrial zone, SHANGHAI which is the economic trade center in China and established in 1985 - KENSHINE PUMP&VALVE MANUFACTURING CO., LTD have developed and enlarged many years, supported by scientific management, sophisticated technology, advanced equipment and strict quality system.
  
  Company is continuously going up as the 40% rising speed every year and is as the one of industrial manufacturer in China.
  
  Company had ISO certificate in 1998 and the products are according to JB/JQ20103 1998 and JB/JQ20104 1998 standard.
  
  The quality of products is insured by PICC.
  
  Company has several sales and service networks in many middle and big cities of China.
  
  The products are sold to domestic cities and exported oversea about 40% products.