How to distinguish the switch direction of the ball valve？

The switch direction of the ball valve is generally clockwise to close and counterclockwise to open. If the ball valve is equipped with a handle, it can be judged by the state of the handle: when the handle switch and the pipeline are parallel, it means that the ball valve is in the open state; when the handle switch and the pipeline are vertical, it means that the ball valve is in the closed state. For rotary ball valves, it can also be judged by the rotation direction: when the knob is rotated counterclockwise, it means that the ball valve is open; when the knob is rotated clockwise, it means that the ball valve is closed.