Thermostatic device for regulating the circulation of a fluid, corresponding thermostatic valve and method for manufacturing such a device

A thermostatic device for controlling a flow of a fluid, the thermostatic device comprising:

• a thermostatic element, which defines an axis and which comprises:
• a piston, extending lengthwise along the axis and securely connected to a fluid-carrying housing;
• and
• a body, substantially centered on the axis and containing a thermally expandable material, the body being movable along the axis relative to said piston so as to extend said piston relative to the body via expansion of the thermally expandable material;
• and
• a shutter, which is movable along the axis relative to a fixed seat of the housing so as to open and close a fluid-carrying passage and which is connected to said body of said thermostatic element so that, via expansion of the thermally expandable material, said body of said thermostatic element drives the shutter axially relative to the fixed seat, the shutter comprising:
• a flexible seal, which is adapted to be pressed sealingly against the fixed seat to close the fluid-carrying passage;
• and
• a rigid frame, which securely supports the seal, the frame comprising:
• a central portion, which is mounted against said body of said thermostatic element so as to be driven by said body of said thermostatic element via expansion of the thermally expandable material;
• and
• an end peripheral part, which is folded back towards the axis and inclined relative to the axis to partially crush said seal, and thereby press said seal radially towards the axis directly against said body of said thermostatic element so as to hold said seal in place on the frame.