Patent ID: 8820565

Claim:
A closure for sealing fluid within a pressure vessel having a hub with an opening therein, the closure comprising: a door for fitting over the opening in the hub and having a central axis; a plurality of curved circumferentially-spaced clamp ring segments, each clamp ring segment having a groove therein extending along an interior of the curved clamp ring segment, each clamp ring segment being radially inwardly movable relative to the central axis of the door from a door open position, with the groove of each clamp ring segment disengaged from the door and the hub, to a door closed position for fitting the groove of each clamp ring segment over an outer exterior portion of both the door and the hub; a plurality of interconnecting members for connecting circumferential ends of adjacent each clamp ring segment; and an actuator mechanism rotatable about the central axis of the door for radially inwardly moving each of the plurality of clamp ring segments from the door open position to the door closed position to dispose the outer exterior portions of both the door and the hub within the groove of each of the plurality of clamp ring segments.