These are multistage pumps especially designed for very high pressure & low capacity. This employs a set of impellerhoused in the diffusers. On the one side of the pump is suction while on the another side it is delivery. The energy added by one impleller keeps on increasing till the last impeller.
For feeding the water in the boiler, spray nozzles in the paper industries, & high head tank feeding applications. In multi storied builing.