Overview of the CDL Light-Duty Vertical Multistage Pump
The CDL is a non-self-priming vertical multistage centrifugal pump designed for clean, non-corrosive liquid transfer. It connects directly to a standard motor via a coupling, with tie bolts securing the pressure barrel and flow-path components between the pump head and inlet/outlet sections. The inlet and outlet ports sit on the same straight line at the pump base, simplifying piping layouts.
This pump handles a wide range of media — from municipal tap water to industrial process liquids — across varying temperature, flow, and pressure conditions. The CDL variant is suited for non-corrosive liquids, while its sister model CDLF handles mildly corrosive media.
Key Features
- Compact vertical design — inline inlet and outlet ports on the same axis reduce piping complexity and save floor space.
- Wide operating range — flow rates from 2 to 200 m³/h, heads up to 280 m, and motor power from 0.75 to 110 kW cover most light-duty applications.
- Motor protection ready — optional smart protector monitors dry running, phase loss, and overload conditions.
- Standard motor compatibility — uses off-the-shelf IEC motors (IP54/IP55, insulation class F, 380V/50Hz), keeping replacement costs low.
- Corrosion-resistant flow path — stainless steel construction extends service life in water supply and HVAC circuits.
Technical Specifications
| Parameter | Range |
|---|---|
| Flow Rate | 2 – 200 m³/h |
| Head | 5 – 280 m |
| Motor Power | 0.75 – 110 kW |
| 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 |
| Max Ambient Temperature | +40°C |
| Max Altitude | 1000 m |
| Motor Protection Class | IP54 / IP55 |
| Motor Insulation Class | F |
| Standard Voltage | 380V / 50Hz |
Operating Conditions
The CDL is designed for thin, clean, non-flammable, non-explosive liquids free of solid particles or fibers. Standard models handle liquid temperatures from -15°C to +70°C; hot water versions extend to +105°C. The maximum ambient temperature is +40°C at altitudes up to 1000 m.
When operating above 40°C ambient or above 1000 m altitude, reduced air density diminishes motor cooling. In these conditions, the motor output power (P2) drops, and a larger motor rating should be selected.
Typical Applications
Water Supply Systems
Water treatment plant filtration and distribution, zone-based water delivery, main pipeline pressure boosting, and high-rise building pressurization.
Industrial Process
Process water systems, cleaning circuits, high-pressure washing systems, and fire protection networks.
HVAC and Boiler Systems
Cooling and air conditioning circulation, boiler feedwater and condensate return, machine tool coolant supply.
Water Treatment
Ultrafiltration systems, reverse osmosis plants, distillation units, separators, and swimming pool circulation.
Agricultural Irrigation
Farmland irrigation, sprinkler systems, and drip irrigation networks.
Installation Guidelines
- Install in a well-ventilated, frost-free location. Maintain at least 150 mm clearance between the pump and motor and any obstacles to ensure adequate cooling airflow around the motor fan.
- Keep the suction pipe as short as practicable to minimize inlet friction losses.
- Install a check valve in the piping system to prevent backflow. For boiler feedwater applications, a check valve must be installed between the pump and the boiler.
- Mount on a concrete foundation or suitable base at an appropriate height. Fixed floor or wall brackets are also acceptable. Do not allow pipe weight to bear directly on the pump body.
- Verify the flow direction arrow marked “Right →” on the inlet/outlet section before startup. Ensure liquid can pass freely through the pump.
- Flush the suction piping before installation. If debris cannot be ruled out, install a strainer 0.5–1 m upstream of the pump inlet — especially critical for pumps with flow rates below 8 m³/h.
- Route the suction piping to avoid air pockets, which can cause cavitation and reduce performance.
FAQ
What is the difference between CDL and CDLF?
The CDL is designed for non-corrosive liquids such as clean water. The CDLF uses upgraded wetted materials to handle mildly corrosive media like dilute acids and alkalis.
Can the CDL handle hot water?
Yes. Standard models are rated for -15°C to +70°C. Hot water versions extend the range to +105°C.
What motor protection options are available?
An optional smart protector monitors for dry running, phase loss, and overload conditions, providing automatic shutdown to prevent damage.
Does the CDL require a foot valve?
The CDL is non-self-priming. If the suction line drains when the pump stops, a check valve (foot valve) is recommended to maintain prime.
What voltage options are available?
Standard is 380V / 50Hz. Other voltage configurations can be supplied on request.
Why Choose Chaodun CDL Pumps
Chaodun’s CDL series combines stainless steel durability with straightforward maintenance. The inline port arrangement simplifies installation, while the tie-bolt construction makes stage replacement accessible without special tools. With flow coverage from 2 to 200 m³/h and heads up to 280 m, the CDL serves a broad spectrum of light-duty pumping applications — from residential water supply to industrial process circuits.