Can the submarine valve of the tanker discharge oil?

In general, the underwater valve of oil tanker is used to prevent oil leakage during oil tanker transportation. When the tanker is fixed on the oil tank of the gas station, the underwater valve will control the connection between the tanker and the oil tank of the gas station to prevent oil leakage. Therefore, the submarine valve must be kept closed during transportation to the gas station and refueling. When the oil needs to be discharged from the tanker, the submarine valve must be opened, otherwise the oil cannot flow out. It should be noted that relevant safety regulations should be observed when unloading oil to ensure safe operation.