Patent ID: 7341161

Claim:
A closure for sealing with a pressure vessel, the closure comprising: a neck for attaching to the vessel, the neck having an access port and an interior profile for radially receiving a locking member; a door sized to close off the access port in the neck and fit within the neck when the door is closed; the locking member carried by the door for locking the door to the neck, the locking member including a plurality of locking segments, the locking member being radially moveable between an open radially retracted position and a closed radially expanded position; a seal for sealing between the neck and the door when the locking member is in the closed position, the seal comprising a fluid energized elastomeric seal body having a fluid energized cavity and formed by mating ends of an extruded seal material and an anti-extrusion backup ring formed from a coiled spring and structurally separate from the elastomeric seal body to prevent extrusion of the elastomeric seal body in response to high pressure; and an operator for moving the locking member between the open position and the closed position, the operator comprising a hand operated lever for moving the locking member between the open position and the closed position, and a linkage mechanism interconnecting the lever with opposing ends of the circumferential locking member.