Grundfos CR pumps are vertical multistage centrifugal pumps. The in-line design enables the pump to be installed in a horizontal one-pipe system where the suction and discharge ports are in the same horizontal plane and have the same pipe dimensions. This design provides a more compact pump design and pipework. Grundfos CR pumps come with various pump sizes and various numbers of stages to provide the flow and the pressure required.
A centrifugal pump has a stationary part and a rotating part. the rotating part is called the impeller. the impeller has a number of vanes which force the water to rotate and creates flow.
The stationary part is called the pump housing, or pump bowl. the bowl also has a number of vanes called guide vanes. their function is to stop the water’s rotation and to convert the energy in the rotation to pressure.
A multistage pumps have several impellers and pump housings or bowls. if a single-stage pump can generate 3 bar, then a two stage pump with the same type of impeller and bowl can generate 6 bar, a three stage pump with the same type of impeller and bowl will generate 9 bar and so on.