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House connection to public water supply systems for improved security of such systems
House connection to public water supply systems for improved security of such systems
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机译:与公共供水系统的房屋连接,以提高此类系统的安全性
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摘要
The stop cock of a house water supply line (1) is preceded by a non-return valve (3) positioned in an inaccessible location below the ground. The housing of the return valve is made out of weldable polyethylene, esp. high pressure polyethylene PE-HD or cross-linked polyethylene XPE.
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