Novel limiting device structure of butterfly valve under high-speed alternating airflow of ship

The utility model belongs to the technical field of ship equipment, and particularly relates to a novel limiting device structure of a butterfly valve under high-speed alternating airflow of a ship. Comprising a universal coupling, a coupling sleeve and a locking support. The locking device is formed by connecting a locking support, a coupling sleeve and a cylindrical pin in sequence and is installed at the extending end of the valve rod, the locking support is installed at the position of an upper flange of the valve body through a screw, the coupling sleeve is connected to the end of the valve rod through a spline, holes are formed in one side of the coupling sleeve and one side of the locking support respectively, and positioning holes are arranged to be locked when the opening degree of the valve is 80 degrees, 85 degrees and 90 degrees. When the locking support is aligned with the positioning hole of the coupling sleeve, the cylindrical pin is fixed to the coupling sleeve through threads and enters the p