| 摘要 |
A sanitary and heating pipe system, which consists entirely or predominantly of plastic, especially polypropylene, and is used for the water supply, is provided with metallic connecting sleeves (1) and with adaptors for connecting the plastic pipes to fittings consisting of metallic materials, and has shut-off valves (21) consisting of plastic, which have a metallic valve seat (26), cast in plastic, for installation in pipelines, and has pressure screwed unions (41) for the pipes (51, 52) which are to be interconnected, and has adaptors for connection to radiators, a welding apparatus with a device for matching the length of the plastic pipes at the ends being used for welding parallel plastic pipes. …<IMAGE>… |
