这种阀门应该具有青铜阀体，包括整合的止回阀，使得温度控制装置能够控制冷水和热水端口。
Valve shall have a bronze body, include integral check valves and operate so the thermostat controls the cold and hot water ports.
尼伯科铸铁阀体止回阀可以安装在水平管线或流向朝上的垂直管线中的任何位置上。
NIBCO Iron Body Check Valves may be installed in both horizontal and vertical lines with upward flow or in any intermediate position.
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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