FIELD: mechanical engineering. SUBSTANCE: first zone of the intermediate portion of the gasket seal is straight. The surface of the second ring at the level of the first zone is curved to form a chute or hollow that defines a sickle-shaped slot space with the latter. The straight portion can move to the curved surface when the pressure of the fluid to be sealed changes before filling the slot space. EFFECT: enhanced reliability. 2 cl, 4 dwg
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