Patent ID: 7117882

Claim:
A valve for changing the direction of flow of a fluid in pipe conduits conducting the fluid to and from a heat exchanger, respectively, said valve comprising a rotatable valve body and an enclosing valve house comprising a cylindrical casing with end plates, wherein said valve body is rotatable around a rotary axis coinciding with a thought centre line of the cylindrical casing, and four flow passages extending through the valve house and being oriented in such a way that two diametrically positioned flow passages are approximately parallel with the rotary axis of the valve body and that the two other flow passages extend obliquely through the valve house, and when the valve body is turned into a first position the flow passages connect a first connection port in the first end plate with a first connection port in the second end plate, and a second connection port in the first end plate with a second connection port in the second end plate, respectively and, when the valve body is turned into a second position, the flow passages connect the first connection port in the first end plate with a second connection port in the second end plate, and the second connection port in the first end plate with the first connection port in the second end plate, respectively wherein the valve body comprises three tubular flow passages and wherein the remaining flow passage is constituted by the space between the valve house and the respective walls around the three flow passages in the valve body.