Patent ID: 8348623
Filing Date: 2013-01-08
Classification: F03B,F05B,Y02B,Y02E,Y10T

Abstract:
1. An apparatus for use in controlling a differential pressure between a fluid column upstream and downstream of the apparatus, said apparatus comprising at least two impellers, each having a rotatable shaft provided with a plurality of vanes or blades, the impellers being disposed in a housing which constitutes a portion of a pipeline, said shafts communicating with a load, said apparatus is arranged for receiving the fluid column between the shafts of the impellers, whereby the velocity of the fluid column through the apparatus substantially corresponds to the velocity of the fluid column immediately adjacent to the impellers of the apparatus, and the impellers of the apparatus are arranged for providing a rotatable barrier for the fluid column in that at least one of the vanes or blades of each of the impellers is in substantially sealing contact with a first portion of the internal jacket surface of the housing, said barrier being influenced by said load to provide any predetermined differential pressure between the fluid column upstream and downstream of the apparatus, wherein at least one of the blades of each of the impellers is constantly in substantially sealing contact with an elongated dividing element which is disposed in a portion of the apparatus, said dividing element providing a partition between the impellers and extending past a straight line through said shafts.