High speed ventilate valve also known as high speed discharge pressure / vacuum valve, which is a vacuum valve, pressure valve and high-speed exhaust device of the trinity of gravity automatic control pressure size cargo oil tank ventilation device. Its function in the process of cargo oil loading can make a large number of mixed gas of exhaust gas discharged into the oil tank. When the valve is open, the velocity of the exhaust outlet is higher than the 30m/s in any traffic, in the unloading process can make a lot of air cargo oil tank, oil tank to balance the pressure; in the process of oil and gas drive can make oil and gas through the discharge valve oil tank ship. In normal navigation, due to temperature changes, a small amount of oil and gas can be automatically discharged into the oil tank or a small amount of air into the cargo tank. When a fire occurs on the oil tanker deck, the high speed air vent valve can prevent the outside flame from entering the protected cabin. Therefore, the high speed air vent valve is an essential oil and chemical tanker.