Supporting rod type large-drift-diameter emergency blocking valve for fire prevention and control and blocking

The invention relates to a stay bar type large-drift-diameter emergency blocking valve for fire prevention and control and blocking, and the blocking valve comprises a pushing unit which is used for pushing a valve plate (7) to rotate; the sealing unit is generated after the valve plate (7) rotates; the pushing unit further comprises an air cylinder (1) used for pushing the valve plate (7) to rotate. The sealing unit comprises a valve plate (7) and a valve body matched with the valve plate (7) to form a closed space. The pushing unit comprises an air cylinder (1), a pushing rod (2), a supporting rod (4) and a valve plate (7) which are connected in sequence; the air cylinder (1) is connected with the push rod (2) in a sliding mode, the push rod (2) is hinged to the supporting rod (4), and the supporting rod (4) is hinged to the valve plate (7). Compared with the prior art, the device has the advantages of being easy to operate, good in man-machine interaction, suitable for different testing environments, capab