Abstract: A rotary joint used for armored diving suits which joint allows rotary motion and which seals the internal portions of the diving suit from the high pressure water in which the user is operating. The rotary joint allows axial movement during operation and reduces premature seal failure due to moments created about the axis of the joint which are prevented from reaching the seals allowing rotating movement. In the event of seal failure, a fail-safe sealing system comprising back up seals not used during normal suit operation is used to isolate the internal portions of the diving suit from water ingress.

Abstract: A rotary joint used for armored diving suits which joint allows rotary motion and which seals the internal portions of the diving suit from the high pressure water in which the user is operating. The rotary joint allows axial movement during operation and reduces premature seal failure due to moments created about the axis of the joint which are prevented from reaching the seals allowing rotating movement. In the event of seal failure, a fail-safe sealing system comprising back up seals not used during normal suit operation is used to isolate the internal portions of the diving suit from water ingress.

Abstract: A joint, subject to a pressure differential between inside and outside, having two tubular members flexibly joined by couplings comprising an annular piston sliding within an annular cylinder containing an incompressible fluid, a fluid reservoir connected to and at a higher pressure than the cylinder interior and valve means responsive to fluid loss from the cylinder allowing fluid flow from reservoir to cylinder. The valve may comprise two semi-circular arms pivoted at their ends to each other and to the piston or cylinder, the arms operating on opposite ends of a rocker plate attached centrally to a valve plunger. A differential piston maintains the high reservoir pressure. The valve is adjustable to operate at a predetermined value of cylinder fluid volume.