Thermostat valve, for an IC motor cooling circuit, has an additional flow path control to keep the bypass open when the motor is started to bring the motor rapidly to its optimum running temperature

摘要

The thermostat valve, in the cooling circuit of an internal combustion motor, has a main thermostat element (30) to operate the closure (22,24) to open/close the main path through the radiator and to open/close a bypass path skirting the radiator, according to the coolant temperature and close the bypass if the coolant is too hot. An additional system (26,36-38) opens/closes the bypass to warm up the motor, as long as the bypass has not been closed by the main thermostat element.