The discharge valve is designed for the quick discharge of fuel from aircraft tanks on the ground after connection of the ground defueling adapter.
Connecting the ground defueling adapter causes a change in position of the poppet valve, which opens the Valve. After disconnecting the ground defueling adapter, the spring pushes the poppet valve back to the seat and closes the Valve. The protective cap assures the second stage of sealing.
Ground fueling management system
It is used on the ground to refuel and defuel the aircraft, allowing safe use of full tank capacity.
