Product Overview of the LG Vertical Multistage Centrifugal Pump

The LG‑type vertical multistage centrifugal pump is a next‑generation water‑supply product developed in accordance with China’s standards for high‑rise building water supply and drainage, as well as the national fire‑protection bureau requirements. Featuring an advanced, highly efficient hydraulic design, this pump offers high efficiency and a broad performance range, thereby better meeting users’ operational needs. The LG series comprises vertical, single‑suction, multistage, sectional, and easily disassemblable centrifugal pumps, with suction and discharge ports located on the inlet and outlet sections, respectively. The rotor assembly consists of a shaft, impellers, impeller retaining sleeves, and shaft sleeves, while the inlet, middle, and outlet sections are joined by tension bolts. Shaft sealing is provided either by soft packing or mechanical seals, with pressurized water from the balance chamber used for lubrication and cooling. The product complies with the JB/T 2727‑93 standard “Types and Basic Parameters of Vertical Multistage Centrifugal Pumps.”

Application Scope of LG-Type Vertical Multistage Centrifugal Pumps

The LG‑type vertical multistage centrifugal pump is ideally suited for use as a booster pump in high‑rise buildings such as residential complexes, hotels, and office towers, as well as for fire‑fighting and sprinkler systems. It is also well‑suited for automatic makeup water supply to cooling towers in chemical processes, for system pressure stabilization, for circulating process water, for long‑distance conveyance, and for boiler feedwater applications. The pump can handle clear water or room‑temperature media with physical and chemical properties similar to water; for the hot‑water version, it is capable of handling media at temperatures below 105°C.

Product Features of the LG Vertical Multistage Centrifugal Pump

1. Low pump cost: By employing a high-speed motor, this pump series boasts a lightweight design, compact size, and reduced manufacturing costs; when equipped with a protective enclosure, it can be used outdoors.

2. Lower operating and maintenance costs: Utilizing a reliable mechanical seal, it features a low failure rate and reduced operational and maintenance expenses.

3. This pump series features a convenient disassemblable design, enabling users to easily replace wear‑prone components such as mechanical seals. Installation and maintenance are straightforward, with no need to dismantle the piping system. The pump’s inlet and outlet are of the same nominal diameter, simplifying pipeline connections.

4. The pumps may be operated in series or in parallel, depending on the required flow rate and head.

5. Depending on requirements, the suction and discharge ports can be installed in the same direction or at 90°, 180°, or 270° angles to accommodate various connection configurations.

6. The pump head can be adjusted by adding or removing stages and by trimming the impeller outer diameter as needed, without altering the installation footprint.

7. Novel structure and reliable operation: The balance drum (or disc) has been eliminated, with axial forces balanced hydraulically, thereby completely resolving the issues of corrosion, seizing, and wear associated with conventional balance drums, thus ensuring more dependable operation.

8. Unique components for noise reduction: A distinctive hydraulic component design and excellent flow performance minimize flow-induced noise to the greatest extent.

Meaning of LG, LGW, and LGR Vertical Multistage Centrifugal Pumps

100LG(W, B, R) - 72 - 20*6

100—Pump inlet diameter (mm)

LGW – Vertical Multistage Firefighting Pressure-Regulating Water Pump

LGR – Hot-Water Type

72-Design Point Flow Rate (m³/h)

20-Design point single-stage impeller head (m)

6-Number of pump stages