RDS systems are designed to reduce the steam pressure to operating pressure and also bring the outlet steam temperature closer to that of saturationSuitably designed pressure reducing valve installed on superheated steam line, reduces steam pressure to desired operating pressure. During this process the steam temperature also reduces following superheated steam curve, how-ever the degree of superheat remains unalteredThe steam temperature is reduced close to saturation by injecting water into high velocity steam by controlled water flow through water control valveConventionally steam pressure reduction and temperature reduction were done in two different units. Now both these functions are carried in one unit which is combined pressure reducing and Desuperheating valve