Pumps for pumping and hydraulic fluids containing sand, gravel, coal, ash, ore, clay, lime milk, flotation tailings, pulp. These devices are resistant to abrasive erosion resistance – it is used: the mines of ores and minerals to transport ore, gravel, sand, stones, paper mills and chipboard production plants for forcing masses of pulp and paper mills, power plants and heating plants for hydraulic ash, pumping of lime milk, mill for pumping water, cement and lime plants for pumping sand and materials production.