1. Product introduction
The QDLF (CDL) stainless steel vertical multistage pump produced by our company is a non self priming vertical multistage centrifugal pump designed and manufactured by absorbing the advanced technology at home and abroad. It uses standard vertical motor and quick assembly mechanical seal, which is very convenient for replacement. The overflow part of QDLF stainless steel multi-stage pump is made of stainless steel 304 material, which is suitable for slightly corrosive media. This product can replace the foreign CR, CRN and other similar products. After the product is put on the market, it is loved by the majority of users because of its high efficiency, energy saving, reliable quality, wide range of use and other characteristics.
2. Product pictures
3. Scope of application
(1) Water supply industry: water plant filtration and transmission, water plant partition water delivery, main pipe pressurization, high-rise building pressurization.
(2) Industrial pressurization system: process water system, cleaning system, high-pressure flushing system, fire protection system.
(3) Industrial liquid transportation: cooling and air conditioning system, boiler water supply and condensation system, machine tool matching, acid and alkali.
(4) Water treatment industry: ultrafiltration system, reverse osmosis system, distillation system, separator, swimming pool.
(5) Irrigation industry: farmland irrigation, sprinkler irrigation and drip irrigation.
(6) Chemical industry: thin, clean, non flammable and explosive liquid without solid particles or fibers.
4. Product Features
(1) QDLF (CDL) multi-stage pump is a vertical structure with small floor area. The center of gravity of the pump coincides with the center of the pump foot, so it runs stably, has small vibration and long service life.
(2) Long service life, beautiful appearance, especially high efficiency and energy saving
(3) After static balance verification, the impeller is fixed with the shaft sleeve and the shaft sleeve nuts on both sides. Its axial position can be adjusted through the shaft sleeve nuts. The axial force of the impeller is balanced by the symmetrical arrangement of its blades, and the residual axial force is borne by the bearing at the shaft end.
(4) The pump shaft is supported by two single row radial ball bearings or four radial thrust ball bearings. The bearings are installed in the bearing bodies at both ends of the pump body and lubricated with grease or thin oil.
(5) The water pump is directly driven by the motor through the elastic sleeve pin coupling.
(6) The shaft seal is a soft packing seal. In order to cool and lubricate the seal chamber and prevent air from entering the pump, a packing ring is installed between the packing. When the pump is working, a small amount of high-pressure water flows into the packing chamber through the trapezoidal groove on the open face of the pump cover or the external unsealed pipe parts, playing the role of water seal.
6. Specifications
7. Installation method
(1) Before the installation of stainless steel multi-stage pump, check whether the fasteners of the unit are loose, and whether the flow passage of the pump body is
QDLF Stainless Steel Vertical Multistage Pump: Operation, Maintenance, and Energy Efficiency Guide
The QDLF stainless steel vertical multistage pump is a highly efficient, corrosion-resistant pump designed for continuous water supply and liquid circulation across industrial, commercial, and municipal applications. Its vertical multistage design allows it to deliver stable pressure, low vibration, and long service life. This guide covers operation procedures, usage recommendations, cleaning methods, and energy-saving standards, helping operators, engineers, and procurement managers maximize performance and reduce operating costs.
The QDLF pump is constructed from high-quality stainless steel, providing excellent corrosion resistance and durability. It is widely used in:
Boiler feed systems
High-rise building water supply
Process water circulation
Industrial cleaning systems
Irrigation projects
Vertical multistage design for high-pressure water transport
Corrosion-resistant stainless steel body and impellers
Compact footprint, saving installation space
Low vibration and quiet operation
Easy maintenance with modular components
Energy-efficient hydraulic design
Proper operation ensures safety, reliability, and optimal pump performance.
Inspect the pump and motor for visible damage.
Check fluid levels in the system to avoid dry running.
Ensure all valves are in the correct position.
Verify electrical connections and grounding.
Confirm that the pump is properly aligned with the driver.
Open the suction valve and partially open the discharge valve.
Turn on the power supply to the motor.
Gradually increase the pump speed if it is equipped with a variable frequency drive (VFD).
Monitor pressure, vibration, and temperature for normal operation.
Slowly close the discharge valve.
Turn off the motor power supply.
If necessary, flush the pump with clean water to remove residual liquids.
Record operating parameters and any anomalies for future reference.
To maximize efficiency and extend service life, consider the following guidelines:
Operate the pump within the recommended flow and head range.
Avoid dry running; always ensure sufficient liquid in the system.
Install inlet strainers or filters to prevent debris from entering.
Check seals and gaskets regularly to prevent leaks.
Use genuine spare parts for maintenance and replacement.
Schedule preventive maintenance to reduce downtime.
Disconnect the power supply before maintenance.
Wear protective equipment when handling hot or pressurized fluids.
Follow manufacturer instructions for lubrication, alignment, and seal replacement.
Regular cleaning and maintenance are crucial for long-term reliability.
Flush the pump with clean water after each operation if pumping dirty or chemical liquids.
Remove impellers and casing covers periodically to clean debris and sediment.
Use non-abrasive cleaning solutions to prevent damage to stainless steel components.
Dry all parts completely before reassembling to avoid corrosion.
| Maintenance Task | Frequency | Purpose |
|---|---|---|
| Visual inspection of pump | Weekly | Detect leaks, unusual noise, or vibration |
| Check alignment between motor and pump | Monthly | Prevent excessive wear |
| Lubricate bearings | Every 3–6 months | Reduce friction and extend life |
| Inspect seals and gaskets | Every 3–6 months | Prevent leakage |
| Replace worn impellers or shafts | Annually | Maintain hydraulic efficiency |
| Electrical system inspection | Annually | Ensure safe operation |
| Performance testing | Annually | Verify flow rate and pressure stability |
The QDLF stainless steel vertical multistage pump is designed to meet modern energy-saving standards, reducing operational costs and environmental impact.
Hydraulic optimization: Minimizes energy loss in impellers and casing.
Variable frequency drives (VFD): Allows speed adjustment according to demand, reducing electricity consumption.
Low-friction bearings and seals: Reduce mechanical energy loss.
High-efficiency motors: Meet IE3 or higher energy efficiency standards.
Lower electricity bills and operational costs
Reduced carbon footprint and environmental impact
Longer pump life due to reduced mechanical stress
Compliance with industrial and municipal energy regulations
The QDLF pump is versatile and can be applied in multiple sectors:
Boiler Feed Systems: Reliable high-pressure water supply for heating and steam generation.
Process Water Circulation: Stable flow for manufacturing and cooling processes.
Industrial Cleaning: Efficient water delivery for cleaning systems in factories and plants.
High-Rise Building Water Supply: Maintains consistent pressure across multiple floors.
Municipal Water Systems: Provides continuous clean water supply for urban areas.
Firefighting Systems: Ensures strong water flow for emergency fire suppression.
Irrigation Systems: Delivers water efficiently to fields and plantations.
Water Transfer: Pumping from reservoirs to distribution networks.
The QDLF stainless steel vertical multistage pump is a reliable, energy-efficient, and corrosion-resistant solution for water supply, industrial circulation, and municipal applications. By following proper operation procedures, usage recommendations, and cleaning methods, users can maximize efficiency, minimize downtime, and extend service life. Its compliance with modern energy-saving standards ensures both cost-effective operation and environmental responsibility.
Whether used in industrial plants, commercial high-rise buildings, or agricultural irrigation systems, the QDLF pump provides consistent high-pressure performance and long-lasting reliability.
Phone：+86 15868545868/+8618968868555
whatsapp：+86 15868545868/+8618968868555
Email：haiwan@haiwanpump.cn
Add：Meiao Street, Qiaoxia Town, Yongjia County Wenzhou City, Zhejiang, China
Copyright ? 2025 Zhejiang Haiwan Pump Industry Co., Ltd.
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