| Term | Main definition |
|---|---|
| Radial Flow Pump | A radial flow pump is a centrifugal pump which is designed with the pump having higher discharge pressures with lower flow rates. |
| Rain to Mains | A rain to mains water pump system allows you to choose between using rainwater or mains water supply. |
| Rigid Pump Shaft | A rigid pump shaft is one that operates below its critical speed. |
| Rotating Seal | When dealing with pump mechanical seals, if the moveable portion of a seal rotates with the shaft, then the seal is said to be a rotating seal. |
