Product Overview
The CDLF series is a non-self-priming vertical multistage centrifugal pump designed for direct coupling with standard electric motors. The motor shaft connects to the pump shaft via a coupling mounted on the pump head, while tension bolts secure the pressure cylinder, flow components, and pump head between the inlet and outlet sections. The pump’s inlet and outlet ports are aligned on the same bottom line, simplifying piping layout. For enhanced operational safety, the CDLF can be equipped with an intelligent protector that monitors dry running, phase loss, and overload conditions in real time.
This series delivers reliable performance across a wide range of applications — from clean water supply to light corrosive liquid transfer. The CDLF variant is specifically engineered for mildly corrosive media, while the CDL variant handles non-corrosive liquids.
Key Features
- Compact vertical design — Saves floor space with inline inlet/outlet ports on the same bottom line
- Stainless steel construction — Resists corrosion and extends service life in demanding environments
- Wide performance range — Flow rates from 2 to 200 m³/h, head from 5 to 280 m, power from 0.75 to 110 kW
- Direct motor coupling — Standard enclosed, air-cooled two-pole motor with IP54/IP55 protection and Class F insulation
- Smart protection options — Optional intelligent protector for dry running, phase loss, and overload monitoring
- Flexible voltage support — Standard 380V/50Hz with custom voltage options available on request
Technical Specifications
| Parameter | Specification |
|---|---|
| Flow Rate | 2 – 200 m³/h |
| Head | 5 – 280 m |
| Motor Power | 0.75 – 110 kW |
| Rated Speed | 2900 r/min |
| Inlet/Outlet Diameter | DN25 – DN150 |
| Liquid Temperature (Standard) | -15°C to +70°C |
| Liquid Temperature (Hot Water) | -15°C to +105°C |
| Ambient Temperature (Max) | +40°C |
| Altitude (Max) | 1000 m |
| Motor Protection Class | IP54 / IP55 |
| Motor Insulation Class | F |
| Standard Voltage | 380V / 50Hz |
Application Scenarios
Water Supply and Distribution
The CDLF series is widely used in water treatment plants for filtration and transfer, district water supply, main line pressurization, and high-rise building water boosting. Its compact footprint and inline piping design make it suitable for installation in confined mechanical rooms where space efficiency matters.
Industrial Process Systems
In industrial settings, the CDLF handles process water systems, cleaning systems, and high-pressure washing applications. The stainless steel wet-end components ensure compatibility with a range of liquid types, while the optional intelligent protector adds a layer of operational confidence.
HVAC and Cooling Systems
The pump serves cooling and air conditioning systems, boiler feed water, and condenser water circuits. With the hot-water variant rated up to 105°C, it covers both standard chilled water loops and elevated-temperature applications without requiring a different product line.
Water Treatment and Purification
The CDLF integrates into ultrafiltration systems, reverse osmosis plants, distillation systems, and separators. Its clean, non-self-priming design and stainless steel construction align well with the hygiene requirements of water purification processes.
Irrigation Systems
Farm irrigation, sprinkler systems, and drip irrigation networks benefit from the CDLF’s stable pressure output and energy-efficient operation across varying flow demands.
Installation Guidelines
- Location selection: Install the pump in a well-ventilated area protected from freezing. Maintain a minimum clearance of 150 mm between the pump and motor and any surrounding obstacles to ensure adequate airflow around the motor’s cooling fan.
- Inlet piping: Keep the inlet pipe as short as practicable to minimize friction losses at the suction side.
- Check valve installation: Verify that the piping system includes a check valve to prevent liquid backflow. When the pump is used for boiler feed water, a check valve must be installed in the piping between the pump and the boiler.
- Foundation: Mount the pump on a concrete base or similar structure of appropriate height. It can also be installed on a fixed floor or wall-mounted bracket. Ensure that piping weight is not concentrated on the pump body to prevent damage.
- Flow direction: The arrow marking “→” on the inlet/outlet section indicates the direction of liquid flow through the pump. Confirm that liquid can pass freely before starting the pump.
- Pre-installation cleaning: Clean the inlet piping before installation. If particulate contamination cannot be ruled out, install a filter screen 0.5–1 m upstream of the pump suction inlet — especially for pumps with flow rates below 8 m³/h — to protect the pump during operation.
- Air pocket prevention: Route the inlet piping to avoid trapped air pockets, which can cause cavitation and performance degradation.
Operating Conditions
The CDLF series is designed to handle thin, clean, non-flammable, non-explosive liquids that do not contain solid particles or fibers. When operating in ambient temperatures above 40°C or at altitudes exceeding 1000 m, the reduced air density affects motor cooling and the motor output power may decrease. In such conditions, a larger motor rating should be specified.
Frequently Asked Questions
What is the difference between CDL and CDLF?
Both share the same platform and performance range. The CDL is designed for non-corrosive liquids such as clean water, while the CDLF features enhanced material compatibility for mildly corrosive media.
Can the CDLF handle hot water?
Yes. The hot-water variant is rated for liquid temperatures from -15°C to +105°C, making it suitable for boiler feed and other elevated-temperature applications.
What motor protection is available?
The standard motor is fully enclosed and air-cooled with IP54 or IP55 protection and Class F insulation. An optional intelligent protector can be added to monitor dry running, phase loss, and overload conditions.
What is the maximum altitude for operation?
The standard rating is up to 1000 m. Above this altitude, motor cooling efficiency decreases, and a larger motor size should be specified to compensate.
Do I need a filter on the inlet?
If the incoming water quality is uncertain, a filter screen installed 0.5–1 m upstream of the suction inlet is recommended, particularly for pumps with flow rates below 8 m³/h.
Why Choose Chaodun CDLF Pumps
Chaodun Pump’s CDLF series combines a compact vertical footprint with the flexibility to serve diverse applications — from municipal water supply to industrial process systems and irrigation. The stainless steel construction, wide performance envelope, and optional smart protection features make it a practical choice for installations where reliability and space efficiency both matter.
With standard voltages of 380V/50Hz and custom options available on request, the CDLF adapts to regional power infrastructure without requiring redesign. For technical support, sizing assistance, or quotation requests, contact the Chaodun Pump team.