Changsha Zoomlian Pump Co., Ltd. 长沙中联泵业股份有限公司

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    DG-Type Horizontal Multistage High-Pressure Centrifugal Pump

    Publication Date:

    2025-09-05

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    Overview of the DG-Type Horizontal Multistage High-Pressure Centrifugal Pump

    The DG-type horizontal multistage high-pressure centrifugal pump is designed for use as a high-pressure boiler feedwater pump or other high-pressure water supply applications. It is also an ideal pump choice for condensate recovery systems, particularly in high-temperature condensate recycling setups. Made from materials that offer exceptional corrosion resistance, high-temperature durability, and excellent anti-cavitation performance, this pump features an additional first-stage impeller, further enhancing its resistance to both corrosion and cavitation. It can withstand extremely high operating temperatures of up to 220°C and handle maximum working pressures as high as 30 kg/cm². This pump is well-suited for applications such as high-temperature condensate recovery, boiler feedwater supply, and various capacity units in industries like power generation, steel production, and metallurgy—supporting both unit-based and main-pipeline feedwater systems. Additionally, it can be utilized effectively in industrial facilities, urban infrastructure, and mining operations for both supply and drainage purposes.

    Zhonglian Pump Industry's technical team has adopted the hydraulic model of a nationally recommended, highly efficient and energy-saving product when designing the DG-type multistage high-pressure centrifugal pump, achieving 8,000 consecutive hours of trouble-free operation. This pump boasts advantages such as high efficiency, a wide performance range, safe and smooth operation, low noise levels, extended service life, and convenient installation and maintenance.

    Zhonglian Pump Industry offers a variety of pump materials for customers to choose from: HT200, OT600, 304, 304L, 316L, 317L, 904L, and CD4.

    There are currently two models available. DG(P) Self-Balanced Boiler Feedwater Pump 、 DG Boiler Feedwater Pump

    DGP-Type Self-Balanced Multistage Boiler Pump (Self-Cooling Type)

    ◆ Structural Features of the DG-Type High-Pressure Multistage Feed Pump

    The DG-type multistage high-pressure centrifugal pump features both its inlet and outlet ports oriented vertically upward. The pump’s suction section, middle section, discharge section, bearing housing, and other components of the pump casing are securely connected as a single unit via tension bolts. The number of pump stages should be selected based on the desired head.

    The rotor of the DG-type horizontal multistage high-pressure pump primarily consists of components such as the shaft, impellers mounted on the shaft, shaft sleeves, and balance discs—among which the number of impellers depends on the pump's stage configuration. The components on the shaft are securely fastened to it using a combination of flat keys and shaft nuts, ensuring they rotate as a single unit. The entire rotor is supported by either two rolling bearings or sliding bearings at each end. The type of bearing used varies depending on the specific application; however, none of these bearings are designed to handle axial forces, as the axial thrust is counterbalanced by the balance disc. During operation, the boiler pump allows the rotor to move axially within the pump casing—but radial ball bearings cannot be employed for this purpose. Rolling bearings are lubricated with grease, while sliding bearings rely on thin oil for lubrication, with an oil ring providing self-lubrication and circulating water for cooling.


    The seals between the suction section, middle section, and discharge section of the DG-type multistage high-pressure centrifugal pump are all made using molybdenum disulfide grease. Additionally, sealing rings and guide vane sleeves are installed between the rotating and stationary parts to ensure effective sealing. When the wear on the sealing rings and guide vane sleeves begins to affect the pump's operational performance, they should be replaced promptly.


    High-pressure pumps typically feature sliding bearings with dilute oil lubrication. The DG-type pump can either use sliding bearings with dilute oil lubrication or rolling bearings with dry oil lubrication, while all other types are equipped with rolling bearings and dry oil lubrication. For medium- and low-pressure pumps, high-quality cast iron is usually selected as the material for key components, whereas high-pressure pumps often utilize cast steel or stainless steel for their main parts. This series of pumps is directly driven by the original motor via an elastic coupling; when viewed from the direction of the original motor, the boiler feedwater pump rotates clockwise.

    ◆ DG-Type Horizontal Multistage High-Pressure Centrifugal Pump Shaft Seal

    There are two types of shaft sealing methods: mechanical seals and packing seals. When a high-pressure pump is equipped with a packing seal, the packing rings must be positioned correctly, and the tightness of the packing material should be just right—ideally allowing liquid to seep out drop by drop. All sealing components of the pump are housed within a sealed casing, which is continuously supplied with water at a specific pressure, serving functions such as water sealing, water cooling, or water lubrication. Additionally, a replaceable shaft sleeve is installed at the shaft seal area to protect the pump shaft.

    ◆ DG-Type Multistage High-Pressure Pump Bearings and Balance Devices

    The rotor of the DG-type medium-pressure pump is supported by rolling bearings at both ends of the pump shaft. It is lubricated with thin oil and cooled using circulating water. Axial thrust on the rotor is automatically balanced by a balance disc. The balanced return water then flows back to the pump suction section via the balanced return pipe.


    The rotor of the DG-type, medium-to-high-pressure pump is supported by sliding bearings at both ends of the pump shaft. Lubrication is provided by thin oil, which is cooled via circulating water. Axial thrust on the rotor is balanced using a balance disc. A return pipe is installed between the balance chamber and the front section.


    The rotor of the DG-type horizontal multistage high-pressure pump is supported by sliding bearings at both ends of the pump. The bearings are lubricated by forced circulation, and the pump itself is equipped with an oil system. Axial thrust on the rotor is balanced by a balance disc, and the design also includes a thrust bearing to handle any residual axial forces that may arise due to changes in operating conditions. Additionally, a return pipe is installed between the balance chamber housing and the suction pipe.

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