HIGH PRESSURE FITTING Russian patent published in 2021 - IPC F16L57/00 

FIELD: connecting elements.

SUBSTANCE: invention relates to a fitting for the mutual connection of low-carbon steel pipes with polyolefin lining. A pipe connecting device for connecting to a polyolefin-lined pipe contains a pipe fitting containing a hollow case with a channel having the first inner diameter at the first end, the second inner diameter located near the second end and exceeding the above-mentioned first inner diameter, and a cone between the first end and the second end, a sealing ring having an inner diameter and an outer cone at one end and a docking relief on the inner surface of the fitting, wherein a cylindrical polyolefin lining, which, at the point of expansion and pressing against the inner surface of the above-mentioned pipe, has an inner diameter almost equal to the inner diameter of the sealing ring, is attached to the pipe fitting by inserting the above-mentioned lining into the channel and following inserting the sealing ring into the above-mentioned lining, as a result of which the pressed part of the above-mentioned lining is engaged with the docking relief. The sealing ring can be inserted into the pipe in such a way that the channel diameter of the put into service pipeline remains constant.

EFFECT: obtaining high-pressure fitting.

19 cl, 4 dwg