FIELD: transport engineering. SUBSTANCE: threaded union has additional flexible sealing member secured on locking cone and projecting beyond working surface of cone. Sealing member can be made in form of ring arranged in groove on locking cone base, or in form of mushroom reinforced by length of wire whose free end is fitted in additional drilled hole in cone apex. Longitudinal dimensions of projecting part of sealing member exceed pitch of thread of central part of turned-in union. EFFECT: enlarged operating capabilities. 5 cl, 5 dwg
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