The vacuum valve equalizes the lower pressure in the tank with the higher pressure outside the tank (atmosphere) in the event of vent system failure and prevents the leakage of fuel from the tank.
The vacuum valve consists of a body with an inlet and outlet port. Inside the body is the poppet which fits tightly to seat inside the valve body. When the pressure in the tank is lower than atmosphere pressure, the poppet moves from the seat and connects the tank with the atmosphere.
Tank protection system
Prevents fuel tank damage caused by pressure changes due to ambient temperature changes or fuel consumption during flight, ensuring safe operation and lower aircraft maintenance costs.
