PROCEDIMENTO PER LA FABBRICAZIONE DI PEZZI PER USO INDUSTRIALE E IN PARTICOLARE DI VALVOLE A CERNIERA E PEZZI OTTENUTI MEDIANTE TALE PROCEDIMENTO

摘要

The present invention concerns a process for the production of industrial parts of synthetic material comprising a portion of a rigid material surmounted by a portion of a flexible material, and in particular industrial parts serving as a means for making a seal between different parts of heating or air-conditioning equipment.