-

The mega-projects that are Ocean plant, seawater desalination, nuclear power generation, etc are
recently gaining the world's interest. The projects are certain to need surge relief valve that is one of
the elements for the safety of the plant system. The surge relief valve is a safety device to protect
surge pressure such as water hammer. Water Hammer is caused by sudden changes in flow.
In recent years Pumping Systems have become large scale and surge relief valve have become large
scale. disc seal that is important parts of surge relief valve have effect on quality. Disc seal with disc
and disc seat are served as sealing function in the surge relief valve. The sealing force on the disc
seal is analyzed by the FEM and design values are optimized by using the Taguchi method.