CDLF Light Vertical Multistage Stainless Steel Centrifugal Pump — Multi-Media Versatility & Installation Guide
The CDLF vertical multistage centrifugal pump is a non-self-priming design that couples a standard electric motor directly to the pump shaft via a head-mounted coupling. Its all-stainless-steel wetted components handle everything from clean tap water to mildly corrosive industrial liquids, making it one of the most versatile pumps in the Chaodun product line. The vertical inline configuration — with suction and discharge ports aligned on the same horizontal axis at the pump base — simplifies piping layout and reduces installation footprint in mechanical rooms.
Core Performance Parameters
| Parameter | Value |
| Flow rate | 2 – 200 m cubed/h |
| Head | 5 – 280 m |
| Motor power | 0.75 – 110 kW |
| Rated speed | 2900 r/min |
| Inlet/outlet diameter | DN25 – DN150 |
| Motor protection | IP54 / IP55 |
| Insulation class | F |
| Standard voltage | 380 V, 50 Hz |
Operating Conditions
The CDLF is designed for thin, clean, non-flammable, non-explosive liquids free of solid particles or fibers. Liquid temperature ranges from minus 15 to plus 70 degrees C for the standard version, and minus 15 to plus 105 degrees C for the hot water variant. Maximum ambient temperature is 40 degrees C at altitudes up to 1000 meters. When operating above 40 degrees C ambient or 1000 meters altitude, reduced air density diminishes motor cooling capacity — a larger motor frame should be selected to compensate.
Structural Design
The pump body assembly uses tie-rod bolts to clamp the pressure cylinder and flow-passing components between the pump head and the suction/discharge section. This bolted construction allows straightforward disassembly for maintenance without requiring specialized tools. The impellers are housed within the pressure cylinder, with each stage adding incremental head to achieve the total design pressure. The motor shaft connects directly to the pump shaft through a rigid coupling mounted in the pump head, eliminating the need for a separate shaft alignment procedure.
An optional intelligent protector can be installed to monitor and protect against dry running, phase loss, and motor overload — important safeguards when the pump is deployed in unmanned or remote installations.
CDL versus CDLF
The CDL variant uses standard materials suitable for non-corrosive liquids such as clean water. The CDLF variant upgrades wetted components to stainless steel, extending compatibility to mildly corrosive media including certain chemical solutions, treated wastewater, and saline water. Selection between the two depends on the specific liquid chemistry and temperature at the installation site.
Installation Guidelines
- Location selection — Install in a well-ventilated area protected from freezing. Maintain a minimum clearance of 150 mm between the pump and motor and any surrounding walls or obstacles to ensure adequate airflow for motor cooling.
- Suction piping — Keep the suction pipe as short as practicable to minimize friction losses at the inlet.
- Check valve — Install a check valve in the piping system to prevent liquid backflow when the pump stops. For boiler feed applications, a check valve is mandatory between the pump and the boiler.
- Foundation — Mount on a concrete base of appropriate height, or secure to a fixed floor or wall bracket. Do not allow piping weight to rest on the pump body — provide independent pipe supports.
- Flow direction — Verify the flow direction arrow marked on the suction/discharge section. Confirm liquid can flow freely through the pump before starting.
- Strainer installation — Clean the suction piping before installation. If pipe cleanliness cannot be guaranteed, install a strainer 0.5 to 1 meter upstream of the pump inlet — particularly important for pumps with flow rates below 8 m cubed/h.
- Avoid air pockets — Route the suction piping to prevent trapped air pockets, which can cause cavitation and reduced performance.
Motor Specifications
The CDLF uses a totally enclosed, fan-cooled two-pole standard motor with IP54 or IP55 protection and Class F insulation. Standard configuration is 380 V at 50 Hz. Motors for other voltages and frequencies are available on request. The direct-coupled design means motor speed equals pump speed — 2900 r/min at 50 Hz — with no gearbox or belt drive losses.
Application Scenarios
Industrial Liquid Transfer
The CDLF handles cooling and air conditioning system circulation, boiler feed water and condensate return, machine tool coolant delivery, and mild acid or alkali media transfer. Its stainless steel construction resists corrosion from treated water and certain industrial process fluids that would damage cast iron pumps over time.
Water Treatment Systems
Ultrafiltration, reverse osmosis, and distillation systems require high-pressure feed pumps with clean, non-contaminating wetted materials. The CDLF’s stainless steel construction meets this requirement, and its multistage design delivers the 10 to 30 bar typical feed pressure for membrane-based treatment processes. Swimming pool circulation and filtration systems also benefit from the pump’s chemical resistance to chlorinated water.
Agricultural Irrigation
Sprinkler and drip irrigation systems operate at higher pressures than gravity-fed systems, requiring a pump that can generate 20 to 60 meters of head across variable field layouts. The CDLF’s multistage design covers this range efficiently, and the stainless steel construction resists corrosion from fertilized irrigation water.
Building Water Supply
Water treatment plant filtered water delivery, district water distribution network boosting, municipal main pressure augmentation, and high-rise building water supply all fall within the CDLF’s operating envelope. The compact inline footprint fits easily into existing mechanical rooms where space is limited.
Industrial Pressure Boosting
Process water systems, cleaning systems, high-pressure washdown stations, and fire protection networks use the CDLF as a reliable booster pump. The multistage arrangement generates the elevated pressures these systems require while maintaining steady flow.
Why Choose Chaodun Pumps
The CDLF light vertical multistage centrifugal pump is designed for versatility — a single model line covering flows from 2 to 200 m cubed/h and heads from 5 to 280 meters. The stainless steel wetted components handle a broad range of liquids, from potable water to mildly corrosive industrial fluids, reducing the need for material-specific pump inventories. The direct-coupled motor eliminates alignment complexity, and the bolted construction simplifies field maintenance. Optional intelligent protection adds dry-run, phase-loss, and overload safeguards for unattended installations.
For model selection assistance based on your flow, head, liquid type, and temperature requirements, contact our engineering team.