What Is The Difference Between An End Suction Pump And A Single-stage Pump?

Feb 28, 2025

End suction pump, also known as single suction pump, refers to a pump in which liquid enters from one end of the impeller; And the single-stage pump we often refer to is an industrial water pump with only one impeller. This is the most direct difference between these two types of pumps, but it may also be easy to confuse these two pump models because they both have a single word.

End suction pump: The structure is relatively simple, consisting of a pump body, impeller, shaft, sealing device, etc. The inlet and outlet are perpendicular to the same horizontal plane, and the pump body is connected to the motor through a coupling, forming a vertical installation method.

Single stage pump: mainly composed of pump body, pump cover, electric motor with output shaft, pump shaft, bearing seat, impeller, mechanical seal, and mechanical seal cover. According to the installation position of the motor, it can be divided into horizontal single-stage pumps and vertical single-stage pumps; According to the suction channel, it can be divided into single-stage single suction centrifugal pumps and single-stage double suction centrifugal pumps.

working principle

End suction pump: When the motor of the pump starts, the impeller on the shaft begins to rotate, causing the liquid to be sucked into the pump body and thrown into the outlet pipe through centrifugal force. During this process, the static pressure energy of the liquid increases, the flow velocity increases, and ultimately flows into the discharge pipeline along the tangential direction.

Single stage pump: Before starting, it is necessary to fill the suction pipeline and pump casing with the liquid being transported. After startup, under the action of centrifugal force, the liquid moves outward from the impeller along the flow channels between the blades, is thrown out from the end of the impeller, and enters the spiral pump casing. Through the pressure difference of the liquid, it continuously enters the impeller along the suction pipeline to replenish the discharged liquid. The impeller rotates continuously, and the liquid is continuously sucked in and discharged.

Performance characteristics

End suction pump: typically suitable for liquid processing needs with small to medium flow rates and low to medium pressures. Due to having only one suction port, its flow rate is relatively small compared to double suction pumps, but its simple structure makes it widely used in some situations where flow requirements are not particularly high.

Single stage pump: The maximum head of a typical single-stage pump is only 125 meters, suitable for transporting liquids at high, medium, and low flow rates. Compared with multi-stage pumps, it has the advantages of high efficiency and smooth operation when the head requirement is not high.

Application scenarios

End suction pump: capable of pumping clean water media, used in air conditioning, heating, pressurization, building water supply, fire protection buildings, etc; It can also pump chemical media similar to water and other corrosive liquid media, and is applied in various fields such as chemical, pharmaceutical, metallurgical, petroleum, etc.

Single stage pump: mainly suitable for industrial, agricultural, urban, drainage, fire water supply and other fields.