| 摘要 |
PURPOSE:To prevent duplicate of planar piping and to eliminate an installation of a rigid tube between piping systems by so coupling a supply tube and a return tube of an independent piping system that the adjacent supply tubes and return tubes in a loop state, and providing an automatic control valve at the coupled part. CONSTITUTION:A supply tube 7 of one piping system 3 is coupled to a return tube 12' of the other piping system 3', and these tubes 7 and 12' are used as new supply tubes. A return tube 12 of the one system 3 is coupled to a supply tube 7' of the other system 3', and these tubes 12 and 7' are used as new return tubes. Simultaneously, an automatic control valve is provided at a tube part for coupling the tube of the one system 3 to the new tube 12' of the other system 3', and another automatic control valve is disposed at a tube part for coupling the tube 12 of the one system 3 to the new tube 7' of the other system 3.
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