Brief description of embodiments of a leaktight seal 1 shows an axial half cross section of the tubular screw - to - screw of the packaging

摘要

An annular seating (20) near the free end of the female element (2) receives a thinned zone of the sealing ring (130) which is compressed radially so a retaining lip (143) is held in another annular seating (18) by a rib (53) on the male element (1) The sealing ring is placed around the male element beyond the thread from the free end. The free end of the male element is engaged in the female element and screwed in, so the annular ring is inserted progressively into a first annular seating (20) in the female element in the form of an enlargement of its axial bore, extending axially from its free end to a shoulder and with a peripheral surface next to the shoulder which acts with the external radial surface of the sealing ring over at least part of its length to compress the ring radially and make a seal. The body of the sealing ring is pushed along the male element by the shoulder in the female element after the two shoulders have butted together, and the annular rib on the male element comes in contact at the end of the screwing process with the retaining lip beyond the thin zone to push the retaining lip into a second annular seating in the female element at an axial distance form the first seating to ensure the sealing ring is held axially by the female element. The sealing ring is made of a synthetic material, a malleable metal or a composite material, with a low coefficient of friction with the male element, in particular polytetrafluoroethylene. The annular rib on the male element brings at the end of screwing the retaining lip in contact with the flank of the second annular seating on the female element next to the shoulder of the first seating. The male thread has diminishing threads at the opposite end to the free end, reducing from the nominal radial height to zero. The peripheral surface of the first seating has a cylindrical surface next to the shoulder of a diameter equal to the external diameter of the body, and a hollowed surface near the free end of the female element. The male element has an axial butting surface designed to act with an axial butting element on the female element to limit the screwing. ALSO CLAIMED is a deformable sealing ring as described above, an assembly using these elements and a tubular threaded joint made as described.