清洗中所排出的污热水进入回水箱后，可对预热管内的冷水进行预热，能充分地利用余热。
In the process of cleaning, after the discharged dirty hot water enters into a backwater tank, the hot water can preheat the cold water in a preheating tube and the residual heat is fully utilized.
对常压热水供热锅炉房的循环泵、回水自动启闭阀、膨胀水箱、大气连通管的设计选型进行了探讨。
The design and lectotype of circulating pump, automatic return water switch valve, expansion tank and atmospheric connection pipe in atmospheric hot water heating boiler room are discussed.
水箱底部连接有回水管，回水管上装有回水阀并且和蒸汽管连通。
The bottom of the water tank is connected with a water return pipe which is provided with a water return valve and is communicated with the steam pipe.
水箱底部连接有回水管，回水管上装有回水阀并且和蒸汽管连通。
The bottom of the water tank is connected with a water return pipe which is provided with a water return valve and is communicated with the steam pipe.
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