DSH series Desuperheater control valve reduces the superheated steam temperature by injecting cooling water in to it. Due to heat transfer principle the water absorb sufficient heat for vaporization to maintain temperature close to that of saturation.
The operation is quite simple , The spray water quantity is controlled with an external control valve. Spray nozzle which received the feedback / signals from controller and downstream temperature sensor. Temperature reduction occurs due to disperse of the minute water particle and atomizing steam counter to the flow of superheated steam , enabling the fine mist to be easily evaporated.

Fixed Nozzle type

• Used for application with near constant load
• Most simple & economical Desuperheater
• Capable of maintaining final temp. of 5 o C
• Used when pressure difference between steam line and spray water is high.
• Maximum turndown 3:1

Venturi Nozzle type

• Compact & Economical in design.
• Difference between spray water and stem line is minimal
• Better mixing of spray water
• final temp. up to 6 C of saturation
• Maximum turndown 10:1

Variable type

• Best design among all de-superheater Valve
• Widely used for application with high load fluctuations
• High performance of spray nozzle assembly.
• Excellent down stream temp. control
• High turn down ration of 16:1

Mechanical atomizing type Desuperheaters are generally used to lowering the temperature of superheated steam to the required set point by injecting atomized water in to the superheated steam flow with spray Nozzle.