Patent ID: 8091517

Claim:
A thermostatic valve for a cooling system of an internal combustion engine wherein a coolant flows among an engine outlet, a coolant cooler, and an engine inlet, the thermostatic valve comprising: a coolant distributing chamber communicating with each of the engine outlet, the coolant cooler, and the engine inlet, a main valve element arranged between the engine outlet and the coolant cooler, a bypass valve element arranged between the engine outlet and the engine inlet, a thermostatic operating element ( 12 , 12 ′) arranged in the distributing chamber for movement in response to coolant temperature in an extension direction between a non-extended position and an extended position for driving the main valve element and the bypass valve element for opening communication between the engine outlet and the coolant cooler, the bypass valve element serving as a pressure control valve and including a valve slide portion ( 23 , 23 ′) for closing communication between the engine outlet and the coolant cooler upon movement of the thermostatic operating element in the extension direction and a valve disk portion ( 25 , 25 ′) disposed upstream of the valve slide portion in the extension direction for closing communication between the engine outlet and the coolant cooler when the thermostatic operating element is in its non-extended position, and a seat component ( 26 ) sealably engagable with the valve disk portion when the thermostatic operating element is in its non-extended position and sealably engagable with the valve slide portion when the bypass valve is moved in the extension direction.