How does the Fuel Tank Breather Valve prevent the tank from being pressurized or vacuum sealed?

1. Prevent the fuel tank from being pressurized
Expansion of working scenarios: During daily driving of the vehicle, with the consumption of fuel, the space in the fuel tank gradually increases, which will cause the volume of air and fuel vapor in the fuel tank to expand, thereby generating a certain gas pressure. Especially when driving at high speed or climbing hills, the gas pressure inside the fuel tank increases more significantly due to the accelerated fuel consumption. At the same time, during the refueling process, the newly added fuel will also bring in a certain amount of gas, which will mix with the air and fuel vapor in the tank, further increasing the pressure in the tank.
Expanded function of the breather valve: As an important part of the fuel tank system, the Fuel Tank Breather Valve ensures the stability of the internal pressure of the fuel tank. When the pressure inside the tank rises to a certain level, the vent valve will automatically open, allowing excess gas to be released into the atmosphere through the vent pipe. The process is continuous and automatic, requiring no manual intervention from the driver. By releasing excess gas in a timely manner, the Fuel Tank Breather Valve can effectively prevent the fuel tank from being pressurized, thereby protecting the fuel tank and fuel system from damage. In addition, the Fuel Tank Breather Valve prevents the creation of a vacuum inside the tank. When the fuel in the tank is consumed and the space increases, if the tank is completely sealed and external air cannot enter, a vacuum will be generated inside the tank. This affects the flow of fuel and the normal operation of the engine. The design of the Fuel Tank Breather Valve allows external air to enter the fuel tank when needed, thereby maintaining a positive pressure state inside the fuel tank and ensuring that fuel can flow smoothly to the engine.
Valve opening and closing expansion: The Fuel Tank Breather Valve is usually equipped with one or more precision-designed valves inside. These valves use highly elastic materials and advanced sealing technology to ensure that the tank is completely isolated from the external environment when the valve is closed. When the internal pressure in the tank exceeds the set value, the valve will automatically sense and open to release excess gas. This process is realized based on automatic control of pressure sensors or mechanical mechanisms without manual intervention. The opening and closing process of the valve requires precise control to ensure that gas is released without allowing too much outside air to enter the tank. Therefore, the valve design of the Fuel Tank Breather Valve usually has a high degree of reliability and durability, and can work normally in various harsh environments. When the pressure inside the tank drops to a certain level, the valve will automatically close to prevent outside air from entering the tank. This automatic opening and closing design ensures the stability and safety of the pressure inside the tank.
2. Prevent oil tank vacuum sealing
Expanded working scenarios: When the vehicle has not been used for a long time, the fuel in the fuel tank will gradually decrease due to natural evaporation or leakage. At the same time, the air and fuel vapor in the fuel tank may also escape, resulting in a certain vacuum state inside the fuel tank. . This vacuum state will have a negative impact on the fuel tank and fuel system. For example, it may cause fuel pump failure, fuel pipeline deformation or damage, and even affect the normal operation of the engine. When driving in high-altitude areas, as the altitude increases, the atmospheric pressure gradually decreases, which will also affect the pressure balance inside the fuel tank. Gas and fuel vapor in the fuel tank escape more easily due to the reduction in external atmospheric pressure, thus exacerbating the formation of a vacuum inside the fuel tank.
Expanded function of the breather valve: The fuel Fuel Tank Breather Valve can sense changes in the pressure inside the tank in a timely manner, and automatically opens when a vacuum is formed inside the tank, allowing external air to enter the tank, thereby quickly balancing the pressure difference inside and outside the tank. This function ensures that a vacuum seal will not form inside the fuel tank, thereby ensuring that fuel can flow smoothly to the engine and ensuring normal engine operation. In addition, the fuel Fuel Tank Breather Valve not only prevents vacuum from being generated inside the fuel tank, but also has a certain filtering effect. It can filter impurities and moisture in the air entering the fuel tank to prevent these substances from causing pollution and damage to the fuel system.
Valve Design Expansion: The valve design of the Fuel Tank Breather Valve is key to ensuring its proper functioning. These valves usually adopt a one-way valve design, which only allows gas to flow out of the tank or outside air to enter the tank, but prevents fuel from overflowing from the tank. This design ensures the stability and safety of the internal pressure of the fuel tank, while also avoiding fuel waste and environmental pollution.