FIRE VALVE FOR AIR LINE Russian patent published in 2006 - IPC A62C4/02 

FIELD: fire fighting equipment, particularly devices, which prevent fire spreading via air lines of ventilation systems.

SUBSTANCE: fire valve comprises pinned rotary gates installed in body and having common drive. Body walls are provided with curved areas and connected one to another by rivets, wherein wall bends are inserted in tires to simplify valve assemblage. Upper and lower body walls have seamless rectangular extensions. Plates with orifices for gate pins connection are installed on side body walls. Each gate is made as box-shaped frame with slots filled with heat-insulation material and covered with heat-sealable strip. Metal sheets with curved parts are fastened to upper gate part. Removable drive includes fixing mechanism with fusible lock. The fixing mechanism comprises stop with two cylinders, which may be inserted in slots made in disc connected with torsion spring fastened to drive body. Bushes with spring arranged in-between are installed on stop axis. The bushes are connected one to another by fusible member.

EFFECT: increased reliability and operational capabilities of the valve.

4 cl, 7 dwg