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.

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.

4、 Main classification

1 - According to the conveying medium

Clean water self-priming pump

Made of cast iron/stainless steel material, with a closed impeller, used for boosting tap water, irrigating farmland, and circulating water supply.

It can only transport clean water and cannot contain a large amount of fiber sediment.

Non clogging sewage self-priming pump

Double channel/cutting impeller, can transport domestic sewage, mild sludge, and wastewater containing a small amount of fiber, mostly used for construction site sewage discharge and small-scale sewage treatment plants.

Corrosion resistant self-priming pump (fluoroplastic/stainless steel)

Transporting acid and alkali, chemical waste liquid, and electroplating wastewater, mostly used for environmental protection dosing and chemical liquid transportation.

2 - According to the structural form

Horizontal self-priming centrifugal pump (ZX, ZW type): commonly used in industry, with stable self-priming and a wide range of head and flow rate;

Vertical self-priming pump: small footprint, directly connected pipeline installation;

Household small self-priming booster pump: 220V single-phase, used for boosting household tap water and taking well water.

3 - Follow the self-priming method

Internal mixing self-priming pump: gas-liquid mixing occurs inside the impeller, with fast self-priming speed and a self-priming height of generally 4-6m;

External hybrid self-priming pump: Gas and liquid are mixed on the outside of the impeller, with a simple and durable structure, commonly used in high flow conditions.

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: Zhangjiagang free trade zone kenshine international trading Co.,LTD

• Phone: +8651258583352

• Address: Room 216-108, Textile resources market, Zhangjiagang , SUZHOU , China

• Email:

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

• Business Description: Our company is specialized in water pumps, electromechanical equipments and accessories etc for many years:
  
  …Various fluid pumps(centrifugal pump, chemical industrial pump, submersible pump, self priming pump, sewage pump, electromagnetic pump, diaphragm pump, gear pump, screw pump etc and their parts such as mechanical seal, pump casings, coupling, impellers etc)
  
  …Oil drilling equipments and parts (triplex mud pump, mud valve, drilling motor, drilling bits and parts of mud pumps such as piston, cylinder, valves and seats etc)
  
  …Mechanical parts and tools, instruments etc