PILOT OPERATED SAFETY RELIEF VALVE FOR NUCLEAR POWER PLANT EQUIPMENT

摘要

The present invention is to provide a safety release valve for a nuclear power plant that prevents thermal deformation due to a uniform temperature distribution of the valve body even at a point in time when thermal conditions such as pressurizer full level operation, pressurizer bubble formation, and valve operation test are changed. A valve body and a disk disposed to be transportable inside the valve body and capable of opening and closing the sealing surface, the valve body has a lower region forming a path through which steam is introduced, and the sealing surface at an upper portion of the lower region As a reference, a disk transfer area in which the disk is transferred and a vapor discharge area in which the increase is discharged to the outside are divided into an upper area, and the upper area is formed in a vertically symmetrical structure. Accordingly, it is effective in improving power plant utilization and safety through design improvement.