Steam Desuperheater is used to spray water into steam so that water get mixed with steam resulting in reduction in the temperature of the outlet steam. Desuperheater can be classified into two. Non-Integral type Desuperheater -Desuperheater nozzle and water valve are separate units, Integral type Desuperheater -Desuperheater is in-built with actuator so that there is no need to separate spray water valve.