How to separate the inlet and outlet of solenoid valve for three-tube carbon canister

Look at this arrow. The arrow direction of the solenoid valve of the three-tube carbon canister points to the rear of the throttle body, the side with the arrow is connected to the corresponding pipeline behind the throttle body, and the other side is connected to the air outlet of the activated carbon canister, so it depends on the arrow to distinguish the air inlet from the air outlet. The electromagnetic valve of carbon canister is a device installed on automobile or motorcycle, which is used to reduce air pollution caused by fuel evaporation and improve fuel efficiency.