VENTILATION AIR-TIGHT VALVE Russian patent published in 2010 - IPC F16K1/22 F16K17/04 F16K15/03 F24F13/10 

FIELD: construction.

SUBSTANCE: invention is intended for use in systems of premises ventilation, in particular for covers that require higher safety in case of sharp rise of air medium pressure. Ventilation air-tight valve comprises cylindrical body. Inside body there is a rotary plate installed. Plate is hingedly fixed in double-arm lever. Lever is connected by axis to stand rigidly fixed in central part of plate. Between lever and plate there is at least one spring installed. One end of spring is connected to plate closer to its peripheral part. The other end of spring is connected to lever. Lever is rigidly installed on shaft. Shaft is displaced aside from central axis of plate and is located between axis, by means of which lever is joined to stand, and point of spring fixation to spring. Lever is arranged from two parallel arranged plates. Plates are connected to each other by means of plate, which is longitudinal relative to shaft, and bushing, which is rigidly set on shaft. Longitudinal plate is connected to spring. Space is arranged between parallel plates. It contains end of stand and axis of stand connection to lever.

EFFECT: improved tightness of valve and efficiency of its operation, simplification of its design.

3 cl, 2 dwg