For nearly 30 years, Dafu has been focusing on technical research, production manufacturing, and market promotion of various pumps and motors, committed to becoming a pioneer in changing traditional water flow. In order to implement the strategy of developing the enterprise through science and technology, we have implemented modern production and management modes of the industry, conducted equipment renovation and process improvement continuously to improve product quality and production efficiency, and promote the comprehensive quality management to establish and improve the quality management system gradually for stabilizing and improving product quality, so as to provide customers with high quality products and thorough service.
Why Choose Us
Professional R&D Team
We have an excellent technology research and development team and type test laboratory of the industry nationwide , also has set up the Shangrao Enterprise Technology Centre and applied for more than 30 patents, which provides a reliable guarantee for product technology and core competitiveness enhancement of the company.
Quality Assurance
The company has passed ISO9001 quality management system certification, as well as other related product certificates such as CE, GS, EMC, ROHS, etc.
Rich Experience
We have 36 years experience sine our establishment in 1988,we are professional in producing and selling water pumps.Meeting the requirements of the product design and process, providing strict testing data.
Production Equipment
We have equipped with the most advanced CNC processing equipment for casting, CNC precision automatic lathe for shaft, UAS patent automatic machine for casting aluminum in rotor, automatic winding machine and other kinds of processing equipment at home and abroad.Our technicians will do regular scheduled maintenance on these machines to guarantee them work well.
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![Vertical Booster Pump]()
Vertical Booster PumpOriginal: Jiangxi, China. Certification: ISO9001,CE, ISO14001 etc.. Price: Negotiable. Material: stainless steel. Delivery date: Negotiableread more -
![Multistage Booster Pump]()
Multistage Booster PumpCDL series stainless steel vertical multi-stage booster pump is a non-self-priming vertical multi-stage centrifugal pump. It has a vertical motor and a quick-install mechanical seal. It has anread more -
![Vertical Multi-stage Pumps]()
Vertical Multi-stage Pumps►The pump is constructed for easy field maintenance and replacement of parts.. ►Fasteners and self-locking devices should not loosen due to vibration or other reasons.. ►The arrow on the pump bodyread more -
![Horizontal Multistage Pumps]()
Horizontal Multistage PumpsOriginal: Jiangxi, China. Certification: ISO9001,CE, ISO14001 etc.. Price: Negotiable. Material: stainless steel. Delivery date: Negotiableread more
Advantages of Multistage Pumps
●Multistage pump has various structures such as vertical, horizontal, and pipeline types, which can be flexibly selected according to the environment, without occupying too much construction area, and has the advantages of stable operation, low noise and vibration, and long service life in the actual operation process;
●The multistage pump inherits the processing efficiency of the centrifugal pump, has a large flow range, and has a higher head on this basis, which is suitable for many occasions with higher requirements for pressurized water transportation;
●The multistage pump is easy to install due to its rich models. For example, in the commonly used vertical mechanism, the diameter is located on the same horizontal centerline and can be installed in any position of the pipeline without changing the pipeline structure. In particular, adding rain protection to the motor Under the premise of the cover, it can also be used directly outdoors;
●The number of stages of the pump can be adjusted by changing the number of internal impellers, so as to meet different requirements and have a very wide range of applications;
●The multistage pump uses high-quality cemented carbide mechanical seals, which can achieve leak-free transportation.
Types of Multistage Pumps
Horizontal Multistage Pumps
Horizontal multistage centrifugal pump is an energy-saving series product. It has the advantages of high efficiency, low operating noise, good anti-cavitation performance, reasonable structure and long service life. It mainly transports clean water or other liquids with physical and chemical properties similar to water.
Vertical Multi-Stage Pumps
Special hydraulic design and structural design, with flow and pressure binning, are more suitable for building fire water supply than ordinary centrifugal clean water pumps. The flow-pressure characteristic curve is flat and has no hump. Made of wear-resistant, corrosion-resistant and anti-meshing materials, it has high reliability.The vertical multi-stage pump can be configured with double water outlets.
Multistage Booster Pump
CDL series stainless steel vertical multi-stage booster pump is a non-self-priming vertical multi-stage centrifugal pump. It has a vertical motor and a quick-install mechanical seal. It has an optimized mechanical seal structure and can transport various media such as water or industrial liquids.
Vertical Booster Pump
CDL series stainless steel vertical booster pump is a non-self-priming vertical multi-stage centrifugal pump. It has a vertical motor and a quick-install mechanical seal. It has an optimized mechanical seal structure and can transport various media such as water or industrial liquids. It is suitable for Different temperature, flow and pressure ranges, also suitable for mildly corrosive liquids.
Difference between Single-stage and Multistage Pumps
Single-stage pumps have one impeller to move fluid, while multistage pumps contain multiple impellers, delivering higher pressure for a wider range of applications. The table below shows a comparison between single-state and multistage pumps.
|
Characteristic |
Single-Stage Pump |
Multistage Pump |
|
Number of Stages |
1 |
Multiple (usually 2 or more) |
|
Pressure Generation |
Lower pressure |
Higher pressure |
|
Flow Rate |
Moderate to high |
High |
|
Efficiency |
Generally high |
High |
|
Space Requirements |
Compact design |
May require more space |
|
Suitable for High-Pressure |
Not suitable for very high-pressure applications |
Suitable for high-pressure applications |
|
Applications |
Domestic water supply, heating and cooling systems, sewage handling, agriculture |
Industrial processes, water treatment, irrigation, boiler feed, high-pressure applications |
|
Installation |
Easy to install |
May require more complex installation due to multiple stages |
|
Energy Efficiency |
May consume less energy due to lower pressure |
Efficient in high-pressure applications but may consume more energy |
|
Cost |
Lower initial cost |
Higher initial cost |
Components of Multistage Pumps
The multistage pump is mainly composed of four parts: stator, rotor, bearing and shaft seal:
The stator part of the multistagepump is mainly composed of the suction section, the middle section, the discharge section and the guide vane. There are tension bolts to clamp each section to form a working room. The D-type pump generally sucks in horizontally and discharges vertically upwards; when it is used for oilfield water injection, the inlet and outlet of the pump are vertically upward. The outlet and inlet of the DG multistagepump are vertically upward.
The rotor part of the multistagepump is mainly composed of shaft, impeller, balance disc and shaft sleeve. The axial force is balanced by the balance plate.
Multistagepump bearings are mainly composed of bearing bodies, bearings and bearing glands. The bearings are lubricated with grease or thin oil.
The shaft seal of the multistagepump adopts soft packing seal, which is mainly composed of the sealing box body, packing and water retaining ring on the water inlet section and the tail cover. D type pump seal water comes from the pressure water in the pump. The sealing water of DG pump comes from external water supply.
Multistage pump rotation. The pump is directly driven by the prime mover through an elastic coupling. Looking at the pump from the prime mover side, the pump rotates clockwise. D and DG pumps are horizontal single-suction multistagecentrifugal pumps. For transporting clean water (with impurities less than 1%, particle size less than 0.1mm) or other liquids with physical and chemical properties similar to water. The medium temperature of D-type pump is less than 100℃, suitable for mine drainage, oil field water injection, factory and urban water supply and drainage. Oil field water injection pumps use different materials according to the corrosiveness of the medium. The medium temperature of the DG pump is less than 120℃, which is suitable for various boiler feed water.
Check the multi-stage pump piping and joints for looseness.Turn the multi-stage pump by hand to see if it is flexible.
Add bearing lubricating engine oil to the bearing body, observe the oil level should be at the center line of the oil standard, and the lubricant should be replaced or supplemented in time.
The multi-stage pump is out of service for a long time. It is necessary to disassemble the pump completely, wipe off the water, and apply grease to the rotating parts and joints.
Try to control the flow and head of the multi-stage pump within the range indicated on the label to ensure that the multi-stage pump operates at the highest efficiency point to obtain the maximum energy saving effect.
During the operation of the multi-stage pump, the bearing temperature must not exceed the ambient temperature of 35C, and the maximum temperature must not exceed 80C.
If abnormal sound of multi-stage pump is found, stop immediately and check the cause.
In the first month of operation, the multi-stage pump changes the lubricating oil after 100 hours, and changes the oil once every 500 hours thereafter.
FAQ
We're professional multistage pumps manufacturers and suppliers in China, specialized in providing high quality customized service. We warmly welcome you to buy high-grade multistage pumps from our factory.
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