如果连接主蒸汽热水器的锅炉不止一个，则在每个锅炉与热水器之间的管路上都应该安装一个截止止回阀。
When more than one boiler is connected to the main steam header, a stop check valve should be installed in the pipeline between each boiler and the header.
这种止回阀应该是模块化的，并且应该采用一个O形环密封在主阀体上。
The check valves shall be modular and shall seal to the main valve body by the use of an O-ring.
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