A sealing arrangement for a pump bearing assembly is incorporated in the bearing housing end cover (6) and comprises two seal rings (1A) and (1B) as the inner sealing elements and a labyrinth passage (3) as the outer sealing element. Means (11) is provided to supply grease via a passageway (10) to egress between the seal rings whereby a pressurised grease barrier is maintained between the seal rings regardless of whether the pump is stopped or running. The grease can pass by the inner ring (1B) to enter the bearing housing (9) to assist lubrication of the bearings (8), and also pass by the outer ring (1A) to be expelled through the labyrinth passage (3) to flush contaminants out of the seal. |