KQSN - X Model Single-Stage Double-Suction Centrifugal Pump
The KQSN-X single-stage double-suction centrifugal pump is an upgraded product that integrates the company’s advanced hydraulic model research results, structural reliability upgrades, versatility and configuration optimization.
KQSN - X Model Single-Stage Double-Suction Centrifugal Pump
This series of products fully adopts excellent hydraulic models, and at the same time improves operational reliability and overall performance by optimizing the overall structure.The rotor has good rigidity, small moment of inertia, small starting current and small impact on the electrical network; the shape and size are optimized, the base load is small and the installation space is saved;The disassembly and assembly structure of the bearing components facilitates on-site maintenance and avoids bearing damage caused by excessive heating, resulting in unstable pump operation.This series of products has parameter planning performance based on market demand over the years, and is matched with a variety of shell and impeller models to be more suitable for a variety of on-site parameter requirements, ensuring efficient and reliable operation.
- Main Parts Material Selection List
- Model Description
- Structure Description
- Rotation Direction Determination
- KQSN-X double Suction Pump Interface Diagram
| Part Name | Material grades and combinations | |||||
| A | B | C | D | E | F | |
| Pump body | HT250 | QT450-10
QT500-7 |
ZG230-450
ZG270-500 |
12% chromium steel | Oritic stainless steel | 2205/2507 |
| pump cover | HT250 | QT450-10
QT500-7 |
ZG230-450
ZG270-500 |
12% chromium steel | Oritic stainless steel | 2205/2507 |
| impeller | HT250
ZG230-450 ZG20Cr13 |
QT500-7
QT600-3 ZG20Cr13 |
ZG270-500
ZG20Cr13 |
12% chromium steel | Oritic stainless steel | 2205/2507 |
| axis | 40Cr | 2205 | 2205 | 2205 | 2205 | 2205 |
| sealing ring | HT200
HT250/ ZCuSn10P1 |
QT450-10
QT500-7 HT250/HT200 ZCSn10P1u |
QT500-7
HT250/HT200 ZCSn10P1u |
12% chromium steel | ZCuSn10P1
Oritic stainless steel |
316L/317L |
| packing bushing | 20Cr13 | QT500-7
HT250 20Cr13 |
QT500-7
HT250 20Cr13 |
20Cr13 | Oritic stainless steel | 316L/317L |
| throat bushing | HT200/
HT250 |
QT450-10
HT250 HT200 |
QT600-3
HT250 HT200 |
12% chromium steel | ZCuSn10P1
Oritic stainless steel |
316L/317L |
| Impeller nut | 45/20Cr13 | 45/20Cr13 | 45/20Cr13 | 20Cr13 | Oritic stainless steel | 2205 |
| Mechanical seal gland | HT200
HT250 |
HT250 | Q235/HT250 | ZG230-450
Q235 |
304 | 2205 |
| Packing gland | HT200
HT250 |
HT250 | Q235/HT250 | ZG230-450
Q235 |
304 | 2205 |
| button | 45 | 45 | 45 | 20Cr13 | 12Cr13
20Cr13 |
Hard-treated duplex steel |
| Mechanical seal positioning sleeve | 20Cr13 | 20Cr13 | 20Cr13 | 20Cr13 | 0C17Ni4Cu4Nb
20Cr13 |
2205 |
Note: Material combination A is a standard product configuration. For special media, the material of the flow parts needs to be reasonably selected according to the situation.


- Exhaust pipeline: Set up a dedicated exhaust pipeline to facilitate on-site operations
- Shaft: The bearing span is small, the safety factor is large, and the rotor structure has good rigidity.
Adopting serialized design, high degree of generalization. - Impeller: The optimal water model of CFD optimization design, with good performance.
The double-suction impeller has small axial force and directional axial force, making the operation more stable.
Using shaft shoulder positioning, positioning is reliable - Shaft seal: The mechanical seal is positioned separately on the shaft with a shoulder to reduce the adverse effects of accumulated axial errors.
The shaft seal cavity is designed universally for packing seals, bulk mechanical seals and packaged mechanical seals, making it easy to interchange the three sealing methods.
The flushing pipeline of medium and high lift pumps is equipped with a throttling orifice plate to reduce the pressure in the seal chamber and ensure the reliability and service life of the seal.
The medium and high lift pump adopts double scroll design to reduce radial force
Comprehensively reduce the center height, improve operational stability, and reduce vibration
It adopts foot support and has high support stiffness.
After CAE finite element stress analysis, the pressure-bearing boundary is checked, and the voltage stabilization durability life is long. - Seal Ring: Replaceable seal ring protects the pump body from wear.
The widened structure can effectively reduce leakage and improve volumetric efficiency. - Throat bushing: Set the throat bushing to facilitate replacement if worn and protect the pump body.
- Bearing:Grease lubricated rolling bearings for easy maintenance
The bearings are individually positioned on the shaft with shoulders to reduce cumulative errors.
The bearing parts are designed with a special disassembly and assembly structure to facilitate on-site maintenance. - Pump casing: precise design of suction chamber and pressure chamber, flow field vortex analysis, improved water efficiency.
Determination of pump rotation direction
Standard type (looking from the transmission end to the pump, the rotation direction of the pump is clockwise)

F: Special type (open from the transmission end to the pump, the rotation direction of the pump is counterclockwise)


- Vibration measurement interface 1
- Temperature measurement interface 1
- Pressure water chamber exhaust port
- Suction chamber exhaust port
- Grease filling port
- Temperature measurement interface 2
- Vibration measurement interface 2
- Import drain port
- Imported pressure measuring port
- Overflow port
- Shaft seal leakage interface
- outlet drain port
- Outlet pressure measuring port
Pipeline transportation such as water supply systems for water plants, circulating water systems for electric power plants and industrial production, irrigation pump stations and drainage pump station systems, building water supply systems, heating systems and refrigeration systems.
Water supply: tap water, industrial water, river water, fire water, heating and hot water, etc.
Mouth diameter: DN150-DN1400mm, flange complies with GB/T17241.6 standard (special ones can be customized).
Speed: 740, 990, 1480 and 2960r/min (corresponding to different speeds according to the model).
Flow rate: 65-13600m³/h.
Lift: 9-320m.
Note: 1. Regarding the NPSH of the device, the influence of local altitude factors (barometric pressure) and medium temperature (saturated vapor pressure) need to be considered.
- When selecting the motor power, you need to consider the influence of local altitude factors (especially when it is greater than 1000 meters).
Efficient, reliable, energy-saving and environmentally friendly
The integrated design of hydraulic power, materials, and structures ensures product reliability and efficiency; the impeller and shell are perfectly matched, resulting in high efficiency, wide efficient area, and high operating efficiency; Reasonable balance of cavitation performance and efficiency indicators, energy-saving and environmentally friendly operation.
Design details promote innovation, reliable operation and easy maintenance
In special structural design, the rotor generates directional force, the bearing and bearing body receive reasonable force and force transmission, and the operation is stable and reliable;
Special disassembly tool design for easy maintenance.
Modular design, easy installation
The functional parts such as shaft seal parts and bearing parts are modularly designed, with a high degree of generalization, a small number of parts, and easy installation and operation.
Intelligent interconnection, smart future
A variety of sensor installation interfaces are reserved, and the data can be connected to the cloud monitoring platform, which can monitor operating status and fault warning online to achieve intelligent operation and maintenance.
The wetted perimeter of the impeller, suction chamber and pressure water chamber is optimized for higher efficiency;
Comprehensively optimize the flow area of the suction chamber, pressure chamber and impeller to achieve better anti-cavitation performance;
The matching relationship between the impeller and the casing is optimized, and the hydraulic structure is better.
The impeller shoulder positioning and rotor design provide reasonable directional axial force, making the operation more stable and reliable;
The weight of the rotor is reduced, the moment of inertia is small, the starting current is small, and the impact on the electrical network is small;
The bearing parts are designed with a disassembly and assembly structure to facilitate on-site maintenance and avoid bearing damage caused by heating and disassembly, resulting in unstable operation;
The sealing chamber structure is set on the shell, with small openings, good support rigidity, and more stable operation;
The center-open handlebar is closer to the axis and the sealing is more reliable;
Optimized bearing span, the rotor structure has good rigidity, runs smoothly and saves installation space;
The bearing adopts shoulder positioning, which has high installation accuracy, stable operation and stable stress;
The fully optimized pump unit has a high center, good stability and small vibration.
Serialized design, with a high degree of generalization of the entire series of products and reduced parts specifications for series products, can effectively reduce operating spare parts inventory;
The packing, mechanical seal and cartridge mechanical seal cavity have the same size, making it easy to replace the shaft seal;
Sealing and bearing optimization can adapt to the needs of various working conditions and occasions;
The flow parts are designed in a variety of materials and can be reasonably selected according to the specific medium conditions.


