Dynamic sealing in an aircraft turbine engine control valve

A control valve, comprising:

• an annular body having a main axis and defining an internal passage configured to receive a flow of a fluid,
• an obturator movable inside the body about an axis of rotation between a position of obstruction of the passage and a position of release of said passage,
• a rod configured to rotatably support the obturator, said rod defining said axis of rotation and passing through orifices of said body,
• guide devices mounted in said orifices and configured to guide the rod, and
• sealing means mounted in each of said orifices around the rod and comprising:
• a tubular bellow mounted around the rod, said tubular bellow being elastically deformable along the axis of rotation,
• a ring mounted around the rod and the tubular bellow and housed at least partly in one of the orifices, said ring comprising a first axial end which is secured to a first axial end of the tubular bellow and which bears axially on a first annular shoulder of the body, and
• a washer mounted around the rod, said washer being interposed between a second axial end of the tubular bellow and a second annular shoulder of the rod, the washer having an external diameter smaller than an internal diameter of the ring, said ring comprising a second axial end configured to bear axially on said second shoulder of the rod in order to define a stroke of axial deformation of the tubular bellow which is axially preloaded so as to maintain the washer axially against said second shoulder.