Clamp ring device for the securing and removal of a cover over a pressure vessel

Claim 1

A clamp ring device for a plurality of bolt-clamp members to facilitate the securing and removal of a cover over a pressure vessel, comprising an annular clamp ring consisting essentially of aluminum and having a plurality of evenly spaced coaxial through bores for the reception of cover bolts and associated cover nuts, each said bore being defined by a cylindrical surface of a predetermined first diameter for the reception of one of the cover nuts, said surface extending from one side of said ring partially toward the opposite side thereof, and the remainder of said each bore being defined by a stepped cylindrical surface of a second diameter at said opposite end followed by a third diameter less than said second diameter and followed by a fourth diameter less than said third and first diameters, a circular ring piston received within said each bore at said stepped surface thereof for axial movement, said piston having outer cylindrical surfaces respectively in engagement with said second and fourth diameter surfaces, high-pressure annular seal means disposed between said third cylindrical surface and said piston, said second and fourth diameter surfaces and the inner periphery of said seal means defining a stepped cylindrical bore for said piston, and said seal means comprising an annular support ring, an elastomeric static seal ring, and an elastomeric dynamic seal ring.