摘要:
A thermostatic element (1) comprises a thermoconductive cup (2) containing a thermo-expandable substance (3) and a piston (4), which is axially displaceable with respect to said cup by the action of the thermo-expandable substance produced during the expansion thereof. The guiding of the piston with respect to the cup and the sealing of the thermo-expandable substance are provided by the same arrangement of a single-piece holder (5) comprising a rigid insert (51) for guiding the piston which is embedded into a flexible envelop (52) impermeable to said thermo-expandable substance and is interposed between the insert, the piston and the cup. In order to provide a reliable sealing between the insert and the cup, including the case of assembling on an automatic line, the insert is provided with an abutment (51) which positions the single piece holder and projectingly extends towards the thermo-expandable substance away from the substantially flat part (51A) of the rest of the insert in a direction which is substantially parallel to the piston axis (X-X) and a space limited on the insert side oriented towards the thermo-expandable substance between the abutment and the flat part of the insert is filled with a corresponding part (52D) of the envelop which is pressed against the cup in a sealing manner.