Thermostatic valve for a cooling circuit

A thermostatic valve for a cooling circuit, comprising:

• a main housing defining an inlet orifice for a fluid and at least one outlet orifice for the fluid;
• a check mechanism movable relative to said main housing and suitable for regulating passage of the fluid between said inlet orifice and said at least one outlet orifice;
• a seat for receiving said check mechanism, said seat being stationary relative to said main housing;
• a thermostatic element including
• (i) a body containing an expandable material, said body being stationary relative to said main housing, and
• (ii) a piston movable relative to said body;
• and
• a connecting piece between said check mechanism and said piston, said connecting piece being fixedly secured to said check mechanism and delimiting a blind recess for receiving said piston, with a base of said blind recess forming a stop for said piston when a difference in pressure on either side of said check mechanism is less than a predetermined value so as to kinematically connect said check mechanism and said piston to each other, and with a wall of said blind recess forming a surface for sliding contact with said piston when this difference in pressure is greater than the predetermined value so as to allow said check mechanism to be displaced relative to said piston in a displacement direction of said piston.