Emergency cut-off valve for filling liquefied gas

The emergency cut-off valve comprises a valve body, connecting pipe ends are arranged on the two sides of the valve body, an end cover is connected to the top of the valve body, an opening and closing rotating piece is in threaded connection with the end cover, and the opening and closing rotating piece is in threaded connection with the valve body. An opening and closing control assembly connected with the opening and closing rotating piece in a matched mode is arranged in the middle of the interior of the valve body, and a pneumatic cut-off mechanism is arranged between the end cover and the valve body. When conduction of liquefied gas through an internal passage of the valve body is blocked, the formed air leakage hole facilitates acting of rising pressure in the valve body on the lifting rod, so that the lifting rod automatically rises and drives the sealing ball to rise, the sealing ball can seal connecting pipe ends on the two sides of the valve body, and danger caused by too large pressure in the valve