FIELD: sealing equipment.
SUBSTANCE: invention relates to sealing equipment and can be used for equipment operating with medium internal pressure, in particular, in valves, pipeline compensators and other equipment. Fixed neck self-packing comprises pressing bottom box, seals and mating element, which press seals with side pressure exceeding pressing pressure to neck and stem pressing neck sealed surfaces under effect of condensed pressure. Movable stem self-packing contains pressing bottom box, seal and mating element, which press seal with side pressure exceeding pressing pressure to stem sealing surface under effect of condensed pressure.
EFFECT: so, that stem sealing surface wear by sealed medium is eliminated.
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