Expansion valve comprising a movable slide

An expansion valve arranged in a fluid passage between an upstream conduit and a downstream conduit, the expansion valve comprising:

• a tubular valve body which is provided, in an upstream axial end section, with at least one upstream orifice in communication with the upstream conduit and, in a downstream axial end section, with at least one downstream orifice in communication with the downstream conduit, the downstream orifice and the upstream orifice being connected by a main channel, a shut-off device which is movable between a closed position and an open position with respect to the downstream orifice, characterized in that the shut-off device includes a slider that is mounted to slide axially on the downstream axial end section of the valve body, between the closed position in which an axial wall of the slider closes off the downstream orifice and the open position in which the axial wall of the slider clears the passage between the downstream conduit and the downstream orifice, and in that the downstream axial end section of the valve body includes, in the vicinity of the downstream orifice, a recess causing progressive and controlled expansion during opening of the expansion valve, the downstream orifice extending radially between the main channel and the recess, the downstream axial end section of the valve body including a frustoconical section with an external diameter decreasing from upstream to downstream up to the downstream orifice.