FIELD: machine building.
SUBSTANCE: present invention pertains to joining cast iron pipes. The composite seal for air-tight sealing into a lock is put between a normal end and a bell-shaped end. The bell-shaped end has a fastening groove, a ring made from elastic material and several locking insertions. Each locking insertion has a head radially facing outside, with a first frontal projection, which can touch the bottom surface of the fastening groove. The head has a second frontal projection, radially displaced from the first frontal projection.
EFFECT: increased strength of the pipe joint.
14 cl, 8 dwg
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