Valve control device

A device for displacing a moving part along a longitudinal axis relative to a housing, said device being symmetrical about a plane extending longitudinally relative to the moving part, the device comprising two structures that are secured to said moving part and elements of active material comprising at least two blocks extending between inside walls of each structure, with the elongation directions of the blocks being antisymmetrical about an axis substantially perpendicular to the displacement axis of the moving part, the structures being flexible and suitable for displacing the moving part by deforming as a function of the elongation of the blocks and comprising oblique pushers that are secured to the moving part, wherein the pushers are geometrically antisymmetrical relative to a plane substantially perpendicular to the displacement axis of the moving part.