Valve device

A valve device, comprising:

• a main housing comprising a first connection and a second connection for a first liquid circuit, and a third connection and a fourth connection for a second liquid circuit, wherein the first connection is permanently fluidically connected to the second connection;
• a valve unit comprising a movably mounted valve element being movable relative to the main housing between a first end position to open an interconnection between the third connection and the fourth connection and a second end position to cut off the interconnection between the third connection and the fourth connection;
• and
• a thermally activatable spring element associated with the movably mounted valve element, wherein the thermally activatable spring element is arranged in a chamber located between the first connection and the second connection, wherein the chamber is permanently cut off from the third and the fourth connection, and wherein the thermally activatable spring element is configured to load the movably mounted valve element in the direction of the second end position,
• wherein the valve unit is configured as a push-in module that is configured to be entirely pushed into the main housing,
• wherein the valve unit further comprises a cylindrical module housing having at one end a bottom which delimits the chamber and the bottom having an opening, wherein the valve element is slidably mounted in the cylindrical module housing and is radially supported by means of a free end in a sealing manner through the opening, and
• wherein at least two additional openings are formed in a shell wall of the cylindrical module housing and are associated with the chamber, wherein one of the additional openings is associated with the first connection and the other of the additional openings is associated with the second connection to fluidly interconnect the chamber along the first liquid circuit.