Multi-stage pump designed for pumping liquids containing solid particles and / or chemically active agents, preferably water for injection into oil reservoirs or pumping the pulp in the wet metallurgy. The pump includes impellers and straightening apparatus axial type, characterized in that the axial force of the rotor, folding of separate axial forces acting on the driving wheels at all levels, does not increase the extent of wear during operation. This eliminates catastrophic wear hydraulic heel. Throttle gap set for the mechanical and hydraulic heel is formed with a fitting hole. The blades of impellers and straightening devices are separate from the sleeves and are connected with them. The blades can be connected with sleeves at different angles relative to the ends of the sleeves. To pump a few sets of impellers provided. Alignment of impeller blades in one set are the same. In other sets of impellers used with other, larger or smaller angles of installation of the blades. This makes it possible to obtain a series of standardized pumps to different operating supply. Angles of the straightening apparatus vanes in each set are selected depending on the angles of the blades of the impellers with a view to ensuring minimum hydraulic losses.
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