Bleeding core air from a turbine engine core flowpath

An assembly of a turbine engine, comprising:

• an engine core including a core flowpath, a compressor section, a combustor section and a turbine section, the core flowpath extending through the compressor section, the combustor section and the turbine section from an inlet into the core flowpath to an exhaust from the core flowpath;
• and
• a bleed system including a bleed port, an inlet passage, an outlet passage, a cavity and a valve element, the bleed port disposed longitudinally along the core flowpath between the inlet into the core flowpath and the exhaust from the core flowpath, the bleed port fluidly coupling the core flowpath to the inlet passage, and the valve element moves between a first position and a second position;
• wherein, when the valve element is in the first position, the valve element fluidly decouples the inlet passage from the outlet passage, and the cavity is fluidly coupled with the inlet passage and is downstream of the valve element;
• and
• wherein, when the valve element is in the second position, the valve element fluidly couples the inlet passage to the outlet passage;
• wherein the engine core extends along a centerline axis;
• and
• wherein the valve element moves axially along the centerline axis between the first position and the second position.