KDW Multistage Pump

Product Overview

The KDW series multi - stage pumps are the latest generation of multi - stage pump products newly developed and designed by Jiangsu Kaifeng Pump & Valve Co., Ltd. Their excellent hydraulic performance and structural features ensure that users can effectively reduce the operating costs of the pumps in various application scenarios.

Technical Parameters

Pump Port Diameter:  Suction 40 - 250mm, Discharge 25 - 200mm
Flow Rate:  Up to 500m³/h maximum
Liquid Temperature:  Maximum ≤80 ℃
Head:  Up to 360m maximum
Direction of Rotation:  When viewed from the motor side, the impeller rotates clockwise
Shell Pressure:  Up to 4.0MPa maximum
Product Standard:  Q/FP 2104 Centrifugal Pumps for General Purposes
(Shell Pressure - Bearing Capacity = Inlet Pressure + Shut - off Head)
Shaft Seal Type:  Packing Seal or Mechanical Seal

Application Fields

The KDW series multi - stage centrifugal pumps are mainly used for pumping clean water and liquids containing trace impurities with physical and chemical properties similar to water. They can be widely applied in the following fields: paper mills, waterworks or water supply companies, liquid booster devices, circulation and cooling systems, fire protection, refineries, water conservancy irrigation, high - pressure water stations, etc.

Product Features

This type of pump is a multi - stage centrifugal pump with segmented, horizontal, and closed impellers, including 10 size specifications. Each specification has 2 to a maximum of 10 impeller stages, and it adopts a unique axial force balancing mechanism: a combination of balancing holes (double - seal rings), labyrinth - type throttling sleeves, and pressure - relief pipes. The residual axial force is borne by a set of angular contact ball bearings.

Each type of pump can be equipped with impellers of different diameters, meeting users' diverse performance requirements and reducing power loss.

For pumps with specifications KDW25 - KDW80, the pump feet on the suction section side are located on the first - stage intermediate section, and the suction port direction can be adjusted appropriately to adapt to different installation conditions.

The drive end is located on the suction section side of the pump.

Shell pressure - bearing capacity：

The Relationship Between Pump Dimension Specifications and Pressure Bearing Capacity of Casing Components

Nozzle Position:

When viewed from the motor end, the pump's suction port faces horizontally to the right, and the discharge port faces vertically upward. For pumps in the KDW25 - KDW80 specifications, the suction port direction can be adjusted to the left according to the user's pipeline layout. When the number of stages is three or more, the suction port can also be positioned vertically upward (please specify these requirements when placing your order).

Flanges:

The inlet and outlet flanges comply with the standard: GB/T 17241.6 - 1998 neq ISO 7005.2:1988. The applicable nominal pressure ratings for the flanges are as follows:

Note:
The inlet flange is of a larger diameter, while the outlet flange is of a smaller diameter. For the same nominal diameter, the flange dimensions for a nominal pressure of 4.0MPa are also applicable to those for nominal pressures of 1.0MPa, 1.6MPa, and 2.5MPa.

Bearings:

The standard configuration is NSK - brand bearings. The suction end adopts cylindrical roller bearings, and the discharge end uses angular contact ball bearings. The bearings are filled with No. 3 complex lithium - based grease before leaving the factory.

Shaft Seals:

According to the usage requirements, the shaft seal can be either a packing seal or a mechanical seal. The mechanical seal is the standard configuration. The installation dimensions of this series of mechanical seals comply with the DIN24960 standard, and the CRANE2100 - type mechanical seal is selected.

Sealing Rings:

All the sealing rings are made of fluoro - rubber (FPM).

Schematic Diagram of the Pump: