BREATHING ORGANS PROTECTION DEVICE Russian patent published in 2006 - IPC A62B7/08 

FIELD: respiratory equipment adapted to be used in irrespirable atmosphere.

SUBSTANCE: device comprises air regeneration system made as regenerative cartridge arranged in breathing bag, hood with fastening means, which secures the hood to user's head and half-mask connected to the hood and provided with connection orifice and with valve installed in side half-mask surface. The valve has filtering means arranged in valve cover. Valve cover is located in mask cavity. Valve body is arranged on outer hood surface.

EFFECT: possibility of initial breathing line filling with air in the absence of gas-and-air mixture in regeneration system due to possibility of breathing via valve in initial period, prevention of contaminated air ingress from hood interior in the case of hood gapping on user's head, increased operational reliability, convenience and usage ability.