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Birger Johannes Laing

Johannes Nikolaus Laing

In a hot and cold water distribution system, cooled down water in the hot water distribution line is automatically drained toward the cold water distribution line by a connection system consisting essentially of a centrifugal pump in series with a valve oriented to prevent the flow of cold water into the hot water distribution line or of hot water into the cold water distribution line by the same valve.

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Marbach, Germany

Birger Johannes Laing