Soda mixture after separation in drum, drops water through the pipe into the loop, and saturated steam into the overheating system, heating to a certain degree of superheat steam.

Separation of water and gas is reliable (water vapor enters from bottom of valve by the U general type), remain the state of water sealing in the valve, effectively prevent leakage of steam.

Since the header on the evaporating heating surface adopts pre-separation structure, the effectiveness and speed of water-steam separation in the drum are improved.