Pressure relief valves for liquid hydrogen tanks

A pressure relief valve for a liquid hydrogen tank, the pressure relief valve comprising:

• a valve body defining a chamber extending between a first end and a second end;
• a seat body coupled to the first end of the valve body and defining a valve seat that extends into and is positioned within the chamber of the valve body;
• a valve disc comprising a flange and defining a sealing surface and a through hole, wherein the valve disc is positioned within the chamber of the valve body, wherein the valve disc is configured to engage the valve seat in a closed position and is configured to disengage the valve seat in an open position;
• a guide disposed within the chamber and including a first guide end and a second guide end, wherein the first guide end defines a recessed surface that securely receives the flange of the valve disc, wherein the through hole of the valve disc enables a back pressure to keep the flange coupled to the recessed surface when the valve disc is moved to the open position;
• a retainer coupled to the guide within the chamber and defining an inner ledge, wherein the flange of the valve disc is secured between the inner ledge and the first guide end;
• a cap coupled to the valve body within the chamber adjacent the second end of the valve body;
• and
• a spring extending between and engaging the cap and the second guide end to bias the valve disc to engage the valve seat in the closed position.