“…Especially under leakage of nuclear power station in Japan, there is important realistic significance to improve design ability of nuclear power valves and product performance. The most of nuclear power valve design at home is given priority to with deformation design, namely, according to the customer's individuation demand with reference to the original mature products, a new type of nuclear power valve products is usually designed by the retrofit design on the basis of the introduced mature technology [4][5][6].…”