Valves are used for wide range of applications. In some of the applications, the valves are subjected to high temperatures. Such high temperature comes as a thermal shock to the valve assembly, results into generation of high thermal stresses. Excessive differential expansion of the equipment, sometimes may lead to its failure. Hence such severe conditions needs to be analyzed in order to ensure safety of the equipment. FEA can be done for static & transient thermal analysis of various types of Valves. Also in some the cases, FSI approach is used to solve the problems.