Feature high-temperature resistant copper coils.

Use new cold-rolled silicon steel sheets for better performance.

Power output exceeds industry standards.

Equipped with high-temperature resistant mechanical seals.

Strong Sewage Handling

High Efficiency and Energy Saving

Excellent Self-Priming Performance

self priming pump


Self Priming

Water Pump

The operation of a self-priming water pump involves the utilization of moving water pressure to create a vacuum within the impeller….

Self Priming

Monoblock Pump

The self priming monoblock pump is a garage floor drain used in residential and commercial settings. A self priming monoblock pump is designed to…


All Copper Motor

Multistage Impeller

Double Channel Shaft Seal

Overheat Protection

Stainless Stell Material

Multiple Protection

Strong Power

Energy Conservation


Let’s talk about self-priming pumps. They’re essential, they’re powerful, and they’re transforming industries worldwide.

Do you want to propel your business forward? Then you need the best self-priming pumps out there.

Looking for a supplier? A supplier that guarantees top quality self priming pump? Your search ends here!

Our comprehensive FAQ guide include all you need to know about buying self-priming pumps in bulk. Dive in and discover how to elevate your operations with the right pump.

Table of Contents

1. What is a self-priming pump?

A self-priming pump is a type of pump that has the capability to clear its passages of air and resume the pumping of liquid without needing any external intervention. This means that the pump can start and continue to operate even if air enters the system, which would typically cause other types of pumps to lose their prime and stop functioning.

2. How does a self-priming pump work?

The self-priming pump operates on its ability to automatically draw in liquid without needing an external water source. The working mechanism involves the following steps:

Preparation Before Starting

Before using a self-priming pump, it is crucial to fill the pump casing with water or ensure that there is enough priming liquid stored within the pump body. This initial step is essential to create the necessary vacuum state upon startup.

Starting Process

When the pump is started, the impeller begins to rotate at high speed. As the impeller spins, water in the impeller channels flows towards the volute, creating a vacuum at the inlet. This vacuum condition opens the suction check valve, allowing air from the suction pipe to enter the pump.

Self-Priming Process

With the impeller’s rotation, air in the suction pipeline is gradually expelled, allowing water to enter the pump. This process repeats in cycles until self-priming is achieved.

The design of self-priming pumps enables them to automatically expel air and continuously draw liquid after the initial liquid intake. This feature makes self-priming pumps ideal for situations where liquid needs to be automatically drawn in without an external suction water source.

3. What are the advantages of using a self-priming pump?

Using a self-priming pump offers several advantages:

  • Ease of Installation:
  • Versatility:
  • Quick Start-Up:
  • Durability:
  • Energy Efficiency:
  • Compact Design:
  • Reliable Performance:
  • Handling Solids:

These advantages make self-priming pumps a preferred choice in many industrial, commercial, and residential applications.

4. What types of fluids can self-priming pumps handle?

Self-priming pumps are highly versatile and can handle a wide variety of fluids, including:

  • Clean Water,
  • Dirty Water
  • Sewage and Slurries
  • Viscous Fluids
  • Chemicals
  • Oils
  • Solvent Mixtures:
  • Aggressive Fluids:
  • Foamy Liquids:
  • Hot Fluids:

This versatility makes self-priming pumps suitable for a wide range of applications, including but not limited to, water treatment, chemical processing, food and beverage production, oil and gas industry, and emergency flood control.

5. What are common applications for self-priming pumps?

Self-priming pumps are used in a wide range of applications due to their versatility and reliability. Some common applications include: wastewater treatment, Irrigation, Industrial Processe, Dewatering, Emergency Flood Control, Marine Applications, Food and Beverage Industry, Oil and Gas Industry, Chemical Processing, Pulp and Paper Industry

These diverse applications highlight the adaptability and efficiency of self-priming pumps in various industries and environments.

6. How do I maintain a self-priming pump?

Safety Precautions

  • Power Supply: Ensure that the power supply is turned off before performing any maintenance or repairs.
  • Drainage: Drain the remaining liquid from the pump body.
  • Valves: Close the inlet and outlet valves.
  • Protective Gear: Maintenance personnel should wear protective clothing, face shields, and safety shoes.

Regular Inspections

  • Inlet and Outlet: Regularly inspect to prevent foreign objects from blocking them, which could cause the motor to run idle.


  • Motor and Pump: The motor and pump must be accurately aligned in a straight line.
    Shaft Seal Guard
  • Fixation: The shaft seal guard should be fixed on the rear cover. When the rear cover is tightened onto the base, it must be precisely centered on the shaft.

Impeller Maintenance

  • Tightening: Tighten the impeller fixing screw in a clockwise direction to lock the impeller.
  • Gap Maintenance: Ensure there is a gap of about 1-1.5mm between the impeller and the middle seal cover to avoid impeller wear.

Rear Cover Installation

  • O-Ring Position: Ensure the O-ring is correctly positioned and not damaged when tightening the rear cover to the main body.

Inlet Check Valve

  • Installation: Equip the inlet with a check valve to prevent liquid from flowing back when the machine stops, ensuring the self-priming capability is maintained.

By following these guidelines, you can ensure the proper maintenance and operation of your self-priming pump, enhancing its longevity and efficiency.

7. What materials are self-priming pumps made from?

Cast Iron Material

Cast iron is one of the commonly used materials for self-priming pumps. Its cost is relatively low, but its mechanical properties are inferior, making it prone to corrosion and rust during use. Therefore, it is suitable for applications with low demands.

Stainless Steel Material

Stainless steel has excellent corrosion resistance and is widely used in the manufacture of self-priming pumps. After processes such as purification, stabilization, and casting, stainless steel self-priming pumps exhibit high strength, high temperature, and high-pressure resistance. Due to its excellent corrosion resistance, stainless steel self-priming pumps are suitable for applications requiring high purity, such as the pharmaceutical and food industries.

Plastic Material

The advantages of plastic materials include being lightweight, corrosion-resistant, and rust-free, with simple production processes and low costs. However, their pressure resistance is relatively low, making them generally suitable for transporting non-corrosive media, such as cooling water.

8. Can self-priming pumps handle solids?

Self-priming pumps are suitable for transporting media that contain small amounts of solid particles or long fibrous materials. They are applicable in various fields such as households, rural areas, factories, and mines.

9. What is the maximum suction lift for a self-priming pump?

The maximum suction lift of a self-priming pump refers to the highest height the pump can draw liquid from a source on or below the ground level to the pump, under optimal working conditions. Generally, the maximum suction lift of a self-priming pump ranges between 5 to 9 meters. However, in practical applications, the maximum suction lift may vary due to different working conditions.

10. How do I select the right self-priming pump for my application?

1. Choose the Type of Self-Priming PumpClean Water Self-Priming Pumps <br>
Sewage Self-Priming Pumps
Determine based on the medium to be transported.
2. Define the Flow RateFlow Rate Units: Cubic meters per hour (m³/h) or liters per second (L/s)
Parameters: Minimum, normal, and maximum flow rates
Selection: Base choice on maximum flow rate and ensure it can handle normal flow rate
If no maximum flow rate data: Consider normal flow rate + 10% as the maximum flow rate
3. Determine the HeadCalculation: Based on horizontal length, vertical height, and number of bends in the outlet pipeline
Head Units: Outlet pressure (e.g., 100 meters head ≈ 1 MPa)
Safety Margin: Increase required head by 5%-10% when selecting the pump
4. Determine the MaterialMaterials: Cast iron, stainless steel (304, 316, 316L), plastic, fluoroplastic alloy
Selection Criteria:
Non-corrosive medium: Cast iron
Slightly corrosive or rust prevention: Stainless steel or plastic with corrosion-resistant properties
5. Self-Priming Pump Suction LiftTypical Suction Lift: Around 5 meters for ordinary pumps like ZW self-priming sewage pump
Consideration: Ensure suction lift does not exceed specified limit
High Suction Lift Requirement: Specify when ordering for lifts between 5 and 9 meters; auxiliary devices may be added
6. Self-Priming Pump Motor RequirementsExplosion-Proof: Select explosion-proof pump if required
Voltage Specification:
Standard Voltages: 220V, 380V
Custom Voltages: 460V, 600V, etc., can be produced based on user requirements

This table provides a structured overview to guide the selection process of self-priming pumps, ensuring all critical parameters and considerations are addressed.

11. What are the common issues with self-priming pumps and how can they be resolved?

Common Issues and Solutions for Self-Priming Pumps

Issue Category

Possible Causes


Insufficient Suction

– Poor exhaust
– Air entering the system
– Incorrect suction height

– Install appropriate exhaust devices
– Adjust the suction height

Pump Body Leakage

– Shaft seal failure
– Leakage at sealing points
– Aging or loosening of sealing components

– Check the shaft seal
– Inspect for damage at sealing points
– Replace or tighten aged seals

Motor Overheating

– Unstable or low voltage
– Overload current

– Check the power supply voltage and motor power
– Adjust as needed

Imbalanced Inlet and Outlet Pressure

– Blocked suction pipeline
– Inlet pipe diameter too small
– Leakage at the discharge point

– Clear debris from the pipeline
– Check the inlet pipe diameter
– Ensure the discharge point is sealed properly

Excessive Operating Noise

– Severe wear of the rotor and pump body
– Damage to mechanical parts

– Replace worn parts
– Replace the entire unit

Pump Not Running

– Power supply failure
– Motor damage
– Tight fitting between rotor and pump body

– Check power connections
– Replace the motor
– Adjust the clearance between the rotor and pump body

Reduced Flow Rate

– Damaged shaft seal
– Inlet check valve closed
– Internal blockage in the pump body

– Replace shaft seals

– Inspect the inlet check valve

– Clear any internal blockages in the pump body

When a self-priming pump experiences issues, it is essential to carefully analyze and troubleshoot the problem to restore stable and efficient operation. Regularly inspecting various components during normal use can ensure the equipment runs smoothly and maintains high production efficiency.

12. Are self-priming pumps energy efficient?

Compared to traditional pump systems, self-priming pumps can reduce energy consumption by more than 30%, while also decreasing noise and vibration, achieving the goal of energy conservation and environmental protection.

13. Can self-priming pumps be used in hazardous environments?

Self-priming pumps can ingest various media. If work medium is toxic or harmful, it can cause injury to personnel. Users need to constantly be aware of whether there are harmful media around the self-priming pump and take appropriate protective measures.

14. What is the difference between a self-priming pump and a standard centrifugal pump?

  • Different Working Principles

Self-priming pumps and centrifugal pumps have distinct differences in their working principles. Self-priming pumps utilize the negative pressure within the pump body to draw in water or liquid, characterized by a high suction lift. In contrast, centrifugal pumps use the rotation of the impeller to generate centrifugal force, which draws the liquid in from the inlet and discharges it through the outlet. The performance of a centrifugal pump is primarily determined by its impeller.

  • Different Applicable Scenarios

Self-priming pumps are mainly used for transporting low-viscosity liquids and are suitable for various natural environments. They can handle liquids containing air (such as pumping distillates, flammable gases, etc.), stirring waste water pools, and pumping waste water containing gas or fuel. On the other hand, centrifugal pumps are primarily suitable for transporting low-concentration acidic or alkaline liquids, clear water, and cold water, particularly under conditions where the temperature is ≤80°C and the flow rate is relatively low (generally <200m³/h).

  • Different Operating Performance

Due to the high suction lift characteristic of self-priming pumps, they are often chosen for applications with special requirements. Centrifugal pumps, however, are more suitable for low-head and high-flow conditions, making them particularly ideal for water treatment in large-scale projects. Additionally, self-priming pumps are known for their simplicity and ease of maintenance, making them relatively easy to service. Centrifugal pumps, due to the complex shape of their impellers, require higher skill levels for impeller replacement.

When selecting between self-priming pumps and centrifugal pumps, it is crucial to choose based on specific needs to avoid inefficiency or even safety hazards due to improper pump selection. Additionally, it is important to adopt modern self-priming and centrifugal pump technologies, actively promote technological innovation, and modernize equipment to improve operational efficiency and stability.

15. Conclusion

NTGD Pump is a professional self priming pump manufacturer, should you have any inquiry or question about pump, please feel free to contact us