Thermostatic valve for a cooling circuit

Thermostatic valve for a cooling circuit, in particular associated with a heat engine, comprising a main housing which forms an inlet orifice for a fluid and at least one outlet orifice for this fluid, a check mechanism that is movable relative to the housing and is suitable for regulating the passage of the fluid between the inlet orifice and the outlet orifice, a seat, which is stationary relative to the housing, for receiving the check mechanism, and a thermostatic element that is provided with a body, which contains an expandable material, and with a piston that is movable relative to the body, said body being stationary relative to the housing, wherein said valve comprises a connecting piece between the check mechanism and the piston, which connecting piece is integral with the check mechanism and delimits a blind recess for receiving the piston, the base of the recess forming a stop for the piston when the difference in pressure on either side of the check mechanism is less than a predetermined value, thus connecting the check mechanism and the piston to each other kinematically, while the wall of the recess forms a surface for sliding contact with the piston when this difference in pressure is greater than said predetermined value, thus allowing the check mechanism to be displaced relative to the piston, in the displacement direction of the piston.