What Is an End Suction Pump? (Definition)

An end suction pump is a type of centrifugal pump where:

  • Water enters through the end (axially) of the pump

  • Water exits from the top (radially)

  • A single impeller creates centrifugal force to move the liquid

It is called “end suction” because the suction nozzle is positioned at the “end” of the pump housing.

End suction pumps are available in two major standards:

  • EN733 (DIN 24255) — common in Europe, Middle East, Asia

  • ISO2858 — widely used for industrial and chemical processes

How Does an End Suction Pump Work?

1. Liquid enters through the suction port

The pump must be filled with liquid or primed before operation.

2. The impeller rotates

Centrifugal force pushes liquid outward.

3. Pressure builds inside the volute

The volute converts velocity into pressure.

4. Water exits from the discharge port

This pressurized liquid is then sent to the piping system.

Main Components of an End Suction Pump

  • Pump Casing (Volute)

  • Impeller

  • Shaft & Bearing Assembly

  • Mechanical Seal or Packing Seal

  • Back Pull-Out Unit (for pumps designed with this structure)

  • Motor / Coupling / Baseplate

Why End Suction Pumps Are So Widely Used

End suction pumps are popular because they are:

✔ Simple to install

Horizontal design, easy piping alignment.

✔ Cost-effective

Compared to other pump types, end suction pumps have lower cost and easier maintenance.

✔ Versatile

Suitable for clean water and industrial liquids.

✔ Easy to maintain

Back pull-out designs allow removing the rotating assembly without disturbing the pipework.

✔ Available globally

Standardized dimensions (EN733 / ISO2858) ensure interchangeability.

Typical Applications of End Suction Pumps

1. HVAC Systems

  • Chilled water

  • Cooling tower circulation

  • Hot water pumping

2. Industrial Plants

  • Cooling and process water

  • Washing systems

  • Filtration systems

3. Water Supply & Pressure Boosting

  • Municipal water distribution

  • Booster pump sets

  • Building water systems

4. Irrigation & Agriculture

  • Farm irrigation

  • Greenhouse water transfer

5. OEM / Package System Integration

Many global OEM manufacturers use end suction pumps for pump skids and equipment packages.

Advantages of End Suction Pumps

  • Compact footprint

  • Cost-efficient structure

  • Wide flow range

  • Easy spare parts replacement

  • High reliability

  • Multiple material options (CI, DI, SS304/316, Bronze, Duplex)

EN733 vs ISO2858 End Suction Pumps

Standard EN733 ISO2858
Region Europe / Middle East / Asia Global industrial & chemical
Structure Standardized sizes, compact Heavier-duty, higher pressure
Common Use HVAC, water transfer Industrial & chemical plants
Efficiency Good High (varies by maker)

How to Select the Right End Suction Pump

To choose the correct pump, you need to confirm:

  1. Flow rate (m³/h or gpm)

  2. Head (m or ft)

  3. Liquid temperature

  4. Installation environment

  5. Material requirement (CI, SS, Bronze…)

  6. Motor speed (1450 / 2900 rpm)

  7. Efficiency requirement (MEI)

For high-efficiency needs, many customers prefer pumps with MEI ≥ 0.40, such as our EK Series.

Are End Suction Pumps Energy Efficient?

Yes — modern hydraulic designs offer high efficiency, especially in optimized models.
Energy-efficient pumps reduce long-term operating cost, which is critical for:

  • HVAC systems

  • Pump rooms operating 24/7

  • Industrial cooling loops

  • Municipal water supply

End Suction Pump vs. Inline Pump: What’s the Difference?

End Suction Pump

  • Horizontal

  • Easier to maintain

  • Handles larger flows

  • Suitable for pump rooms

Inline Pump

  • Vertical alignment

  • Saves space

  • Used inside buildings or narrow spaces

Conclusion: Why End Suction Pumps Are Essential in Modern Engineering

End suction pumps combine:

  • Simple structure

  • High reliability

  • Low installation cost

  • Wide compatibility with global standards

This is why they remain one of the most popular centrifugal pump types for municipal, industrial, commercial, and agricultural systems.

 

If your project requires an efficient, durable, and globally compatible end suction pump, feel free to contact our engineering team for selection and support.