Patent ID: 9217358
Filing Date: 2015-12-22
Classification: F01P,F16K,G05D

Abstract:
1. A thermostat device that controls a flow rate of a liquid coolant in a cooling system circuit, the thermostat device comprising: a cylindrical valve seat; a main valve which closes the cylindrical valve seat by being caused to approach an inside of the cylindrical valve seat; and a thermosensitive movable body which drives the main valve by detecting a temperature of a liquid coolant, wherein an outer circumference of an approach portion to the cylindrical valve seat of the main valve is provided with a circular sealing lip that is elastically pressure-welded to an inner peripheral surface of the cylindrical valve seat when the valve is closed continuously throughout the whole circumference thereof, and the inner peripheral surface of the cylindrical valve seat is sealed by the circular sealing lip throughout the whole circumference thereof when the valve is closed, the circular sealing lip is provided so as to form a waveform having concave and convex portions curving in a drive direction of the main valve, due to the thermosensitive movable body, and the liquid coolant starts to flow in and out through a liquid coolant passage formed between the cylindrical valve seat and a convex portion of the circular sealing lip when the main valve moves from a valve closing state and a curving convex portion of the circular sealing lip is separated from the inner peripheral surface of the cylindrical valve seat.