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.

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。

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In the hot water system a high water tank with solenoid valve controlled water feeder is used to replace the secondary circulating pump.

热水系统中，采用电磁阀根据水箱液位进行补水，省去二次循环泵。

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And a by-pass pipe with check valve is set between the inlet and outlet of circulating pump.

在循环泵进出口之间设置带止回阀的旁通管。

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