Patent ID: 9709999
Date: 2017-07-18
CPC Classifications: F03G,G01K,G05D

Claim:
1. A thermostatic element, comprising: a rigid cup, which contains a thermally expandable material, a rigid piston, which is translatable, along its axis, relative to the cup, under the action of the thermally expandable material during an expansion of that material, a rigid guide for guiding the translation of the piston, said guide being rigidly secured to the cup, a flexible seal for sealing the thermally expandable material with respect to the outside of the thermostatic element, said flexible seal having a globally annular shape that is centered on the axis and that is axially crossed all the way through by the piston, said flexible seal comprising first and second opposite axial parts, against which the guide and the cup are respectively pressed substantially antagonistically so as to compress the seal around the piston, and an anti-extrusion washer, which is mounted coaxially around the piston and is axially interposed between the guide and the first part of the seal, wherein a raised portion protruding from a surface of the guide is pressed against the first part of the seal so as to over-compress the first part of the seal around the piston, the raised portion being suitable for making the compression rate of the first part of the seal equal to a value strictly greater than its value associated with an operational thermostatic element formed by the cup, the piston, the guide, the seal and the anti-extrusion washer assembled to each other without the raised portion.