FIELD: mechanical engineering; sealing facilities.
SUBSTANCE: proposed device contains pack of working collars with spring toques having sealing and support surfaces and variable-thickness central projection and groove corresponding to projection on opposite end face. It has also pressure collar, pressure ring made of the same material as collar, and supporting. Pressure collar and pressure ring are aligned and made in form of common ring pressure support in which projecting stop is provided on end face adjoining the working collar and beveled outside surfaces are found on sides of stop. Angles of tilting of said surfaces are equal to or less than corresponding angles of support surfaces of working collar spring tongues in free state.
EFFECT: reduced overall dimensions, increased service life of device.
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