Abstract: Nuclear power plant process globe valves are typically used to control the on-off state of the loop mediμm, and their sealing performance directly affects the safe operation of the nuclear power plant. Damage to the sealing surface of the globe valve can lead to changes in the surface roughness and geometric tolerances, resulting in a decline in sealing performance, necessitating grinding repairs. To investigate the impact of sealing surface roughness and geometric tolerances on sealing performance, research on the grinding of globe valve sealing surfaces and heliμm leak detection tests were conducted. This research aimed to explore a more precise relationship between the sealing surface roughness, geometric tolerances, and sealing performance. The findings can guide subsequent grinding repair work on the sealing surfaces of globe valves in nuclear power plants.