A closure assembly coupled to a vessel including a chamber and an access port in communication with the chamber, the closure assembly comprising: a door assembly coupled to the vessel and configured to move between an open position and a closed position, the door assembly in contact with the access port...http://www.google.de/patents/US7001468?utm_source=gb-gplus-sharePatent US7001468 - Pressure energized pressure vessel opening and closing device and method of providing therefor
Pressure energized pressure vessel opening and closing device and method of ...
