Device for changing a flow direction through a heat exchanger and use thereof

A device for changing a flow direction through a heat exchanger, comprising:

• a valve housing and a rotatable valve member arranged inside the valve housing, said valve housing comprising a first end, a second end and a center axis extending between said first and second ends;
• a first port, a second port, a third port and a fourth port, said first end being provided with the first port, and said second end being provided with the third port and the fourth port, wherein the valve member is rotatable between a first position and a second position and, in the first position, defines a conduit between the first port and the third port and, in the second position, defines a conduit between the first port and the fourth port, wherein
• the valve member is rotatable around an axis of rotation offset from the center axis, said axis of rotation extending through the center of the first port, and the first port is angularly displaced 90° around the center axis in relation to the third and fourth ports, wherein
• the valve member comprises a first plate and a second plate forming a dividing wall for dividing the interior of the valve housing into two compartments.