Patent ID: 8210498

Claim:
A gate valve for a system controlling cooling in a turbomachine, comprising: a gate mounted so that the gate can pivot about an axis between a position in which the gate shuts off an air passage orifice and a position in which the gate opens the orifice; and means for rotating the gate about the axis, wherein the means for rotating comprise two superposed coaxial rotary members collaborating with one another via cam surfaces, the first rotary member being fixed in terms of translational movement along its axis of rotation and the second rotary member being capable of translational movement along the axis and bearing the gate, the cam surfaces being designed so that rotating the first rotary member from the shut-off position causes a translational movement of the second rotary member and of the gate along the axis of rotation followed by a rotation of the second rotary member and of the gate about the axis, the cam surfaces of the two rotary members being formed at axial ends of the rotary members and comprising ramps inclined in the form of a helix around the axis of rotation, and wherein the inclined ramps are connected at least at one of their ends to stop faces that are radial with respect to the axis of rotation, a stop face of the first rotary member being configured to come into abutment against a stop face of the second rotary member.