Very short transitions from one direction E to another are obtained using stamped glued knees; The transitions performed in this way from the point of view of the conductivity of the pipeline are not the most profitable, but they often have to use due to lack of space.
The size of the bend in arcs made in hot state on pipes made of solid polyvinyl chloride depends on the diameter and thickness of the walls of the pipe. Smaller radii can be obtained if bending is carried out in the templates, the temperature of the molding is precisely observed and very rapid cooling of curved areas is ensured. At the same time, however, you need to use pipes with thicker walls; So, for example, when performing the knees of sewer pipes (for example, under washbasins), 0.5 atm pipes are never used., And pipes from a number of 2.5 or 6 are always used.Branches are easily manufactured using stamped shaped connective T-shaped elements. The ends of all three pipes are narrowed and glued into a shaped connection. The technology for performing compounds requires great experience and skill. The end of the pipe inserted into the bell is heated to a temperature not exceeding 100-110 ° C. When the end of the pipe cools in the T-shaped connection (regardless of the speed of cooling), the pipe gives shrinkage. Due to the fact that polyvinyl chloride has a large coefficient of thermal expansion, this shrinkage is so significant that a dense planting of the bell often cannot be obtained. The tightness of the connection is not achieved and when it is additionally glued. In connection with the indicated cooling of the pipe inserted into the T-shaped shaped element, you should not be produced in the tee itself.