20-inch Large Mixed-flow Pump

The 20-inch large mixed-flow pump refers to a horizontal volute mixed-flow pump with a nominal diameter of 500 mm (i.e., 20 inches) at both the inlet and outlet. It is a main model in the large-diameter section of the HW/HB series. Combining the high-pressure capability of centrifugal pumps and the large-flow characteristic of axial-flow pumps, the liquid flows obliquely out of the impeller. It performs exceptionally well in high-flow and medium-low head conditions. It is the core pump type for large-scale farmland irrigation areas, urban flood prevention and drainage, river water diversion, industrial circulating water, and other scenarios.

High flow rate, medium-low head, strong drainage capacity: The maximum flow rate of a single unit can reach 3800 m³/h (approximately 1.06 m³/s), and one pump can meet the drainage requirements of small and medium-sized pumping stations, reducing the number of parallel units and construction investment. The head range of 5 to 22 m perfectly covers mainstream applications such as farmland irrigation, urban drainage, and river water diversion.
Mixed flow characteristics, wide efficiency range: It has a larger flow rate than centrifugal pumps and a higher head than axial flow pumps. The efficiency range covers a wide range of flow rates from 1800 to 3800 m³/h and head ranges from 5 to 22 m. It can still maintain 82% to 86% efficiency under variable conditions and has significant advantages in long-term operation electricity costs.
Sturdy structure, suitable for continuous heavy load: The 20-inch pump body has a wall thickness of 12 to 16 mm, the pump shaft diameter is 60 to 80 mm, the bearing seat is cast integrally with the pump body, and it can withstand 24-hour continuous full-load operation, suitable for severe conditions such as flood control and drainage during peak irrigation periods.
Front and rear opening structure, no need to dismantle pipelines for maintenance: Opening the pump cover allows the extraction of the rotor components (impeller + shaft + bearing). The inlet and outlet pipelines and the motor remain in place, reducing the downtime for maintenance by more than 60%, which is particularly important for pumping stations that cannot stop water supply for a moment.
High customization degree: Supports mechanical seals (zero drip leakage), stainless steel impellers (for seawater/light corrosion), vacuum self-priming modification, dual power coupling (motor + diesel engine), etc., to meet different industry standards.

Large-scale farmland irrigation pumping stations: They draw water from rivers and reservoirs and then transport it through main canals to tens of thousands of acres of irrigation areas. The 20-inch mixed-flow pumps have a single-unit flow rate of 2,000 to 3,800 m³/h and a lift of 7 to 15 m. They are the main selection for pump stations in irrigation areas covering over 10,000 acres.
Urban flood prevention and drainage: When urban areas experience flooding due to heavy rain, 20-inch mixed-flow pumps are deployed in flood drainage pumping stations or mobile pump trucks, with a flow rate of over 3,000 m³/h to quickly pump out the water. They are the backbone of the urban drainage and flood prevention system.
River/Reservoir water diversion: Relay pumping stations for cross-basin water diversion projects, river ecological water replenishment, and reservoir drainage for maintenance and discharge. The 20-inch mixed-flow pumps have a large flow rate and moderate lift, and a single stage can meet the requirements.
Industrial circulating water: Circulating cooling water systems in thermal power plants, steel mills, and chemical plants require large flow rates and medium-low lift for transportation. The 20-inch mixed-flow pumps are commonly used in circulating water pump rooms.
Aquaculture centralized water supply: Centralized water intake and water exchange systems for large-scale aquaculture bases (over 1,000 acres), where 20-inch mixed-flow pumps can serve dozens of ponds simultaneously, replacing multiple small pumps in parallel.
Mobile flood prevention pump trucks: 20-inch mixed-flow pumps are often mounted on heavy-duty trailer chassis, equipped with diesel engines to form mobile pump trucks, used for emergency drainage during extreme rainstorms and temporary diversion of rivers.

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