Blocking valve of steam distributing vertical shaft

The invention discloses a blocking valve of a steam distributing vertical shaft. The blocking valve comprises a shaft tube of a hollow structure and a movable plug, the movable plug is rotationally arranged on the outer side wall of the inner cylinder of the vertical shaft, a plurality of steam distribution flat pipes are uniformly distributed on the periphery of the outer cylinder of the steam distribution vertical shaft, the shaft tube is used for driving the movable plug to seal one of the steam distribution flat tubes, the movable plug comprises a plug, an elastic device, a hydraulic piston and a top support channel steel, wherein the plug and the top support channel steel are respectively arranged at the two ends of the elastic device, the top support steel channel is connected with the outer wall of the vertical shaft inner cylinder, the hydraulic piston is arranged at one end of the shaft tube, the end of the hydraulic piston penetrates through the elastic device and is connected with the plug, a hydra