TUBULAR THREADED CONNECTION Russian patent published in 2018 - IPC F16L15/04 

FIELD: valves production.

SUBSTANCE: invention relates to a tubular threaded connection which under the action of a tensile load is undoubtedly broken on the side of the internal thread of the first threaded section of the first row of turn of threads, which is the location of the normal critical section, and not on the internal thread of the first threaded section of the second turn of threads extending from the intermediate shoulder. In addition, when the shoulder is located between the first row of turn of threads and the second row of turn of threads and the mutual engagement of the internal and the external thread of the intermediate shoulder, the threaded gap L1G on the bearing side of the first row of turn of threads, which is a row of threads on the radially internal side, and the threaded gap L2G on the bearing side of the thread turn of the second row of thread turns, which is a series of threads on the radially external side, always satisfy the expression L1G<L2G.

EFFECT: invention increases the efficiency of the tubular threaded connection.

4 cl, 5 dwg