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The mean-time between failures of piston-driven drilling pumps is limited by the performance of high-wear parts and components of its hydraulic part. The reliability of the latter depends on the wear resistance of parts and assemblies of the cylinder-piston group and valve pairs, the main ones are cylinder bushings, piston with core, rod, valve seat, seat, hydraulic box, and seals of cylinder sleeve, valve, seat, hydraulic box covers. Details of valve pairs of mud pumps wear out faster than parts of cylinder-piston groups. Increased wear rate of parts of the hydraulic part of a piston pump due to the content of abrasive particles in the flushing fluid pumped by the piston pump, the action of high contact stresses on the working surfaces of the main parts and assemblies of the hydraulic part of the mud pump, cyclic and shock action of the loads on the working surfaces of the above parts and assemblies, as well as insufficient wear re-

SUBSTANTIATION OF IMPROVEMENT DIRECTIONS OF PISTON DRILLING PUMP VALVE PARTS FOR THEIR FAILURE AND TIGHTNESS IMPROVING