Plumbing and heating pipe system for water supply purposes, made either completely or mainly of plastic material, especially of polypropylene

Plumbing and heating pipe system for water supply purposes, made substantially of plastic material, including pressure-type screw connections especially for hot water and aggressive liquids, the improvement comprising an internally threaded union nut with a bottom-side annular flange provided with a central opening for the passage of one or two liquid pipes therethrough and intended to receive an end flange of said one liquid pipe, and comprising an externally threaded nut which surrounds the other one of said liquid pipes and is adapted to be screw-connected with said union nut and the lower end of which is adapted to be screwed against an end flange of said other liquid pipe, said end flange of said other liquid pipe engaging the end flange of said one liquid pipe.

Plumping and heating pipe system for water supply purposes, made substantially of plastic material, including reducers for connecting radiators in rooms, especially for installation of the heating pipes so as to be concealed by a skirting board, consisting of two interconnected pipe pieces having ends and which follow the extension of the skirting board and of which one pipe piece is connectable to the heating water flow while the other one is connectable to the heating water return, the improvement comprising that the two interconnected pipe pieces are disposed one above the other and the upper pipe piece includes the two pipe unions for the heating water flow and return, respectively, of which the one pipe union bridges the cross-section of the upper pipe piece inside the contour of said pipe piece by means of a bridging passageway which opens into the lower pipe piece inside the contour thereof.

Plumping and heating pipe system for water supply purposes, made substantially of plastic material, including an arrangement for a welding device for welding parallel plastic pipes having ends and by means of which arrangement the ends of the plastic pipes can be equalized as to their lengths, the improvement comprising a straddling body adapted to be disposed on the parallel plastic pipes and having an upwardly pivotable bracket member which in its upwardly pivoted position can be pivoted downwards transversely to the longitudinal pipe axis across the pipe ends and is provided with an end plate for abutment of the pipe ends thereat.