Combined pressure-reducing and desuperheating valve

摘要

The invention relates to a combined pressure-reducing and desuperheating valve with a valve housing, with a main spindle which interacts with a closing part, and with a device arranged within the valve housing for the purpose of adding water to cool the steam. This device is used to predetermine the water in each case as a function of the respective spindle opening travel. Since fine control is not possible in this way, this is carried out by means of an additional control valve. In contrast, the invention proposes that the control valve should now be arranged within the valve housing and have an auxiliary spindle which can be actuated from outside and interacts with an auxiliary seat opening into the valve housing part on the outlet side. Since the control valve is now structurally integrated into the pressure-reducing and desuperheating valve, a considerably lower water pressure is sufficient for adequate fine control. The technical outlay is also considerably lower.