Ball valve

The invention relates to the technical field of ball valves, and provides a ball valve which comprises a valve body, a valve cover arranged on the valve body, a valve element assembly arranged on the valve cover in a penetrating mode and a movable filter screen assembly arranged on the valve element assembly in a penetrating mode. According to the ball valve, the fixed filter screen and the movable filter screen are arranged in the rotatable ball body, the movable filter screen is rotated to be attached to the inner wall of the second fluid channel, and the movable filter screen and the fixed filter screen can form a circular filter screen to filter fluid passing through the ball valve; when the ball valve needs to be closed, the movable filter screen can be rotated to make contact with the fixed filter screen, the semicircular fixed filter screen and the semicircular movable filter screen can form a lever perpendicular to the axis of the valve rod in the ball body, assistance capable of driving the ball body