The article deals with composite materials used for sealing the shaft of the main pump units (MNA) pumping stations. It is shown that an increase in the reliability and durability of metal-sealing devices MNA is possible through the development and application of new wear-resistant nanocomposites based on polytetrafluoroethylene (PTFE), as well as improving the design of mechanical sealing devices in order to increase the required degree of hydraulic unloading.