FIELD: sealing technology; sealing articles at two-way sensing of increased pressure. SUBSTANCE: device has stack of collars provided with lugs having sealing and bearing surfaces; collars are provided with central projections of varying thickness and respective groove found on opposite end face; it is also provided with pressure ring which is engageable with rear portion of extreme collar. Collar stack is formed from two parts in such way that central projections of each part are directed to opposite sides; placed between these parts is pressure ring made in form of two opposite central projections engageable with wedge-shaped supports which widen with distance from axes of central projections; their outer sides form cylindrical surfaces engageable with cylindrical pair. EFFECT: enhanced reliability. 6 cl, 5 dwg
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