Anti-rotation structure of axial-flow type check valve for LNG

The invention discloses an anti-rotation structure of an axial-flow type check valve for LNG. The anti-rotation structure comprises a main body, a first connecting ring is installed on the side face of the main body, and a second connecting ring is installed on the side face of the first connecting ring. A through pipe is fixedly installed on the side face of the second connecting ring, and a connecting plate is fixedly installed at the top of the through pipe. A first lead screw penetrates through the top of the connecting plate, a push block is slidably connected to the bottom of the first lead screw, a transmission ring is fixedly connected to the side face of the push block, an anti-rotation mechanism is installed on the side face of the transmission ring, and an adjusting mechanism is installed in the through pipe. Due to arrangement of the anti-rotation mechanism and the anti-rotation structure, when a movable block slides forwards, a movable rod can be driven to rotate, when the movable rod rotates, th