FIELD: shut-off fittings. SUBSTANCE: seal-unit of shut-off device includes sealing member 4 provided with two circular projections 5 engageable with surfaces of mounting seat 2 formed by concentric taper surfaces 3. These surfaces form two taper linear seals when they are engageable with circular projections 5. One initial cylindrical surface of projection is engageable with one taper surface of mounting seat or two cylindrical surfaces of projection are engageable with two taper surfaces of mounting seat 2. Sealing member 4 or member of shut-off device is provided with drainage venting passage 6 fitted with blank 7. EFFECT: enhanced reliability. 9 dwg
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