Patent ID: 8430260

Claim:
A closure for a vessel, comprising: a hub having an access opening to the vessel, the hub having a circumferential stop face spaced between the access opening and the vessel and a plurality of recesses each extending radially outward from an adjacent inner surface of the hub; a door for positioning between the stop face and the vessel; a seal for sealing between the door and the stop face; a latch member for bringing the door to sealing engagement with the stop face, such that fluid pressure in the vessel forces the door against the stop face; a plurality of lugs each extending radially outward from an adjacent exterior surface of the door, such that during opening of the closure a respective lug passes through a respective recess in the hub and a portion of the seal extends radially outward of the door and circumferentially along a respective lug to seal between the respective lug and the hub, and the door may be moved to pass through the plurality of recesses and out of the hub; at least one elongate flexible member connected with the door and extending from the access opening; one or more locking pins for selectively securing the door to a swing arm; and an elongate tube movable with the door and surrounding the flexible member, the flexible member movable to position the door with respect to the hub.