Valve controller for pressure stabilization

An apparatus for controlling pressure in a pressure vessel, wherein the pressure vessel is connected to a pressure source by a plurality of valves, and wherein the pressure vessel includes one or more pressure sensors arranged to measure pressure within the pressure vessel, the apparatus comprising:

• a sensor input configured to receive pressure signals from the one or more pressure sensors;
• a maximum pressure threshold input configured to receive a maximum pressure threshold signal;
• a minimum pressure threshold input configured to receive a minimum pressure threshold signal;
• a power output configured to provide a power supply to the one or more pressure sensors;
• a valve signal output configured to output valve driver signals;
• a valve controller configured to:
• compare the one or more pressure signals to the maximum pressure threshold signal and the minimum pressure threshold signal;
• upon the one or more pressure signals dropping below a value associated with the minimum pressure threshold signal, outputting a first valve driver signal that causes at least one of the plurality of valves to open;
• and upon the one or more pressure signals rising above a value associated with the maximum pressure threshold signal, outputting a second valve driver signal that causes at least one of the plurality of valves to close;
• wherein the pressure vessel is a liquid fuel propellant tank for an engine of a spacecraft, wherein the maximum pressure threshold signal and the minimum pressure threshold signal are received from a flight management computer for the spacecraft that dynamically adjusts the maximum pressure threshold signal and the minimum pressure threshold signal based on performance of the engine of the spacecraft.