Patent ID: 8028926

Claim:
A thermostat valve arrangement for a cooling circuit of an internal combustion engine, the thermostat valve arrangement comprising: a housing having a main conical sealing valve seat; a guide component supported by the housing and having a hollow cylindrical section; a main valve member movably engageable with the main conical sealing valve seat formed on the housing; a bypass valve member spaced from the main valve member in an axial direction of the main valve member and movably engageable with the hollow cylindrical section of the guide component; an expansion element within the housing having a first section and a second section, said first section cooperable with an abutment fixed to the housing and said second section cooperable with the main valve member and the bypass valve member in the axial direction of the main valve member such that the main valve or the bypass valve is selectively closed or open to produce the cooling circuit of the internal combustion engine; and a valve spring between the main valve member and the guide component, wherein when the main valve member is closed, the main valve member is biased by the valve spring to be directly engaged with the main valve seat, and the bypass valve member is disengaged from the hollow cylindrical section of the guide component; when the main valve member is open, the main valve member is pressed by an expansion of the expansion element and disengaged from the main valve seat, and the bypass valve member is pressed by the expansion of the expansion element into the hollow cylindrical section of the guide component, wherein said guide component includes a radial flange integrated with the hollow cylindrical section and projecting radially away from the expansion element, said valve spring surrounds the expansion element and the entirety of the hollow cylindrical section and up to the radial flange, wherein the guide component comprises at least one guide groove parallel to the axial direction of the main valve member and extending into the hollow cylindrical section, and said guide groove includes a section facing the bypass valve member, and the bypass valve member comprises a radial lug introduced into the section of the guide groove in a bayonet connection.