Patent ID: 11939938
Assignee: BLUE ORIGIN, LLC
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 7:
8. A vent line, comprising:
a vent valve having a vent pressure range;
an equalization valve structured to cause a liquid propellant to be released from the vent line into a propellant tank; and
a controller configured to:
determine when a level of the liquid propellant within the propellant tank is below a height of the equalization valve within the propellant tank, and
when the level of the liquid propellant falls below the equalization valve, send an instruction to:
cause the vent valve to open from a closed position and to close from an open position, the opening and closing to reduce pressure of the propellant tank, and
cause the equalization valve to close from an open position.