These valves contain plastic check modules and should never be directly sweated into the line. Sweat fit adapters should be sweated into the line prior to valve installation.

• 这些阀门包括塑料止回模块,不应该直接通过焊接将其连接到管道上。在安装阀门之前,应该先将焊接适配器焊接到管道上。