VENTILATION VALVE OF UNDERGROUND WORKING Russian patent published in 2018 - IPC E21F1/14 E21F17/103 E06B7/22 E06B5/16 

FIELD: ventilation.

SUBSTANCE: valve contains a support frame (framing) mounted in the walls of tunnel, a leaf (web) hingedly fixed to the frame, closing-opening mechanism of the web mechanically connected to the web and framing and gap sealing unit between the web and the frame with a closed web, made of the elastic material placed between the approaching surfaces of the web and the frame when the valve is closed. In this case, the gap sealing unit is made in the form of a rigid collar placed along the perimeter of frame in the zone of abutment to the border of web, while on both sides of collar a flameproof elastic sealing profile made of material that increases considerably in the volume with heating is fixed, and collar height is smaller than the height of elastic sealing profile. The collar serves as a stopper for the initial deformation of elastic sealant when the web is closed and serves as a reinforcing element with an increase in the volume of sealant when it is heated.

EFFECT: ensuring reliable operation of vent valve.

3 dwg