THERMOSTATIC VALVE WITH SLEEVE, THERMAL ENGINE ASSOCIATED WITH A COOLING CIRCUIT INCLUDING SUCH VALVE, AND METHOD FOR MAKING THE SLEEVE FOR SUCH VALVE

摘要

According to the invention, the thermostatic valve (10) includes, on the one hand, a mobile sleeve (30) for adjusting the flow of fluid through the valve body (20), said sleeve comprising a tubular body (31) provided with peripheral sealing fittings (32, 33, 34) adapted for interaction by sealed contact with the fixed seats (25A, 26A, 27A) in order to stop the fluid flows between the openings (21, 22, 23) defined by the valve body and, on the other hand, a thermostatic member (40) including a fixed portion (42) rigidly connected to the valve body and a fixed portion (41) movable in translation in the direction of the axis (X-X) of the sleeve under the action of a volume variation of a thermo-expansible material, the sleeve being kinematically connected to the mobile portion so that the movement of the mobile portion relative to the fixed portion controls the movement of the sleeve relative to the seats. In order to easily and economically improve the tightness of the contact between the sleeve and the seats, the body and the sealing fittings are respectively made of a thermoplastic material and an elastomer that are selected to be successively injection-moulded so that, at the release of the mould after the elastomer injection, the thermoplastic material and the elastomer adhere together due to a chemical, physical and/or physico-chemical effect.