FCT desuperheater control valve 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 1. Non-Integral type Desuperheater Desuperheater nozzle and water valve are separate units 2. Integral type Desuperheater Desuperheater is in-built with actuator so that there is no need to separate spray water valve Desuperheater nozzles are also classified into 1. Venturi type Nozzle orifice is fixed irrespective of flow variation 2. Variable orifice Orifice area opening will vary according to the flow and pressure variations
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