Centrifugal Pump

Centrifugal Pump Selection: 16 Sub-Families Explained

A centrifugal pump moves liquid by converting the rotational energy of an impeller into pressure, which makes it the default choice for clean or lightly contaminated fluids at low viscosity. Because that brief covers a very wide range of duties, Qingdao Green Power builds 16 sub-families under one range, each aimed at a specific service — from water boosting and sewage handling through to high-head boiler feed and oil transfer.

Sub-family overview

• IS — end-suction centrifugal pump for general water supply and transfer.
• ISW — horizontal inline centrifugal pump for circulating loops where floor space is limited.
• ZX — self-priming centrifugal pump that lifts liquid without a foot valve.
• ZW — self-priming wastewater pump for dirty water and light solids.
• CYZ — self-priming fuel and oil pump for transfer duty.
• CDL / CDLF — vertical multistage centrifugal pumps for high-head boosting.
• D — high-head centrifugal pump for long-distance or high-lift duty.
• DG — multistage hot water pump for heating systems.
• GC — multistage boiler feed water pump.
• MD — horizontal multistage centrifugal pump.
• HW — horizontal mixed flow pump for large-volume, low-head circulation.
• WQ — submersible sewage pump for sumps and wet wells.
• SFB — corrosion-resistant centrifugal pump for mildly aggressive liquids.
• TSB — grease decolorization pump for edible oil refining.
• WFB — self-priming pump for clean water duty without a priming system.

Performance range

Across the range the published flow envelope is 1.5–1600 m³/h with head from 2 m to 125 m. Individual sub-families sit inside that envelope rather than spanning it: multistage CDL and CDLF units cover high-head, low-flow duties, while the mixed flow HW design handles large volumes at low head. Selection should start from the duty point, not from a series name.

Typical applications

• Water supply and pressure boosting
• Wastewater transfer and sewage handling
• Boiler feed and hot water circulation
• Fuel and oil transfer
• HVAC and district heating loops
• General industrial process water

How to specify a centrifugal pump

Four inputs are enough to start sizing: the flow you need, the head the system requires, the liquid and its temperature, and the installation arrangement (dry, inline, submersible or self-priming). If the liquid is more viscous than water, say so early — centrifugal efficiency falls quickly as viscosity rises, and a positive displacement pump such as a screw or lobe unit becomes the better answer.

Frequently asked questions