Patent ID: 9568087
Date: 2017-02-14
CPC Classifications: F16H

Claim:
1. A mechanical feedthrough for a pressure vessel having an outer wall delimiting a high pressure side and a low pressure side comprising: a cylinder extending through the outer wall of the pressure vessel and having a wall defining a bore; and a piston extending along an axis and being positioned within the bore of the cylinder, the piston being exposed to the high pressure side and the low pressure side of the pressure vessel and being movable within the bore of the cylinder to transmit at least one of rotational and axial movement through the outer wall of the pressure vessel, the piston including a radially extending flange for engaging the wall of the cylinder to define first and second pressure cavities within the bore on opposing sides of the flange, a first fluid passageway fluidly connecting the first pressure cavity with the low pressure side such that low pressure forces acting on the piston are counteracted by low pressure forces acting on the flange, a second fluid passageway fluidly connecting the second pressure cavity with the high pressure side such that high pressure forces acting on the piston are counteracted by high pressure forces acting on the flange.