FIELD: machine building.
SUBSTANCE: invention is provided for prevention of contingency at pipelines, connected to air emission with toxic agents at explosion. Explosion-blocking device contains cylindrical casing. Casing is outfitted by butt joint with inlet and outlet fittings of air duct. In casing it is located spool-and-sleeve in the form of two put on each other immovable inner and movable outer sleeves. In latter there are implemented concentric openings. Sleeves are outfitted from butt by annular basis. In basis of inner sleeve opposite to basis of outer sleeve it is installed at least one permanent magnet. This magnet fix spool-and-sleeve in closed position.
EFFECT: reliability enhancement of overlapping of air duct at explosion and excluding of leaking thorugh it with airstream of injurous additives.
9 cl, 1 dwg
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