Patent ID: 8328042

Claim:
A port closure device for a vessel, the port closure device comprising: a first annular flange having a first opening; a second annular flange attached at a predetermined distance from the first annular flange, the second annular flange having a second opening; a seal ring disposed adjacent the first annular flange and having a third opening, at least a portion of the first, second and third openings overlapping such that an access path is formed through the first annular flange, second annular flange and seal ring; a slidable door disposed between the seal ring and the second annular flange, the slidable door having a first position obstructing the access path and a second position outside of the access path; an annular interface region between the first annular flange and the seal ring, the annular interface region being sealed by an interior annular seal and an exterior annular seal; and at least one spring disposed within the annular interface region between the interior annular seal and exterior annular seal, the at least one spring pushing the seal ring away from the first annular flange.