DL, DLR-type pumps are vertical single-suction multi-stage segmented centrifugal pumps designed for conveying water that contains no solid particles and has physical and chemical properties similar to clean water. These pumps are primarily used for high-rise building water supply systems but can also be applied in industrial and mining environments for drainage and liquid transfer. The flow rate ranges from 4.9 to 200 m³/h, with a head range of 22 to 239 meters. They are available with power ratings between 1.5 and 160 kW, and the pump inlet diameter ranges from Φ40 mm to Φ150 mm.
Model Designation:
- 80: Nominal suction diameter (in mm)
- DL: Vertical multi-stage centrifugal pump
- DLR: Vertical multi-stage hot water centrifugal pump
- 4: Pump series designation
Applications:
The DL and DLR series pumps are widely used in industrial and urban water supply and drainage systems, high-rise building pressurization, fire boosting, long-distance water distribution, heating systems, bathroom applications, boiler heating and cooling water circulation, air conditioning, refrigeration systems, and other water supply equipment. The DL type is suitable for media temperatures up to 80°C, while the DLR type can handle temperatures up to 120°C.
Construction and Materials:
The DL pump consists of an electric motor and the pump unit itself. The motor is a Y-type three-phase induction motor, and the pump and motor are connected via a coupling, forming a rigid assembly without the need for alignment or adjustment. The pump is divided into a stationary part and a rotating part. The stationary section includes the suction casing, intermediate casing, guide vanes, discharge casing, stuffing box, and other components. To reduce wear, the stationary parts are equipped with seal rings and balance sleeves, which can be replaced when necessary. The rotating part is supported by the shaft, impellers, and a balance drum, with any residual axial force handled by angular contact ball bearings. The suction, intermediate, and discharge casings are sealed using paper gaskets. Sealing can be achieved using packing or mechanical seals, and users can choose based on their specific requirements. The pump rotates counterclockwise when viewed from the drive side.
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